luna - libev/ev.c

   1/*
   2 * libev event processing core, watcher management
   3 *
   4 * Copyright (c) 2007,2008,2009,2010,2011,2012,2013 Marc Alexander Lehmann <libev@schmorp.de>
   5 * All rights reserved.
   6 *
   7 * Redistribution and use in source and binary forms, with or without modifica-
   8 * tion, are permitted provided that the following conditions are met:
   9 *
  10 *   1.  Redistributions of source code must retain the above copyright notice,
  11 *       this list of conditions and the following disclaimer.
  12 *
  13 *   2.  Redistributions in binary form must reproduce the above copyright
  14 *       notice, this list of conditions and the following disclaimer in the
  15 *       documentation and/or other materials provided with the distribution.
  16 *
  17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
  19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
  20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
  21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
  25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  26 * OF THE POSSIBILITY OF SUCH DAMAGE.
  27 *
  28 * Alternatively, the contents of this file may be used under the terms of
  29 * the GNU General Public License ("GPL") version 2 or any later version,
  30 * in which case the provisions of the GPL are applicable instead of
  31 * the above. If you wish to allow the use of your version of this file
  32 * only under the terms of the GPL and not to allow others to use your
  33 * version of this file under the BSD license, indicate your decision
  34 * by deleting the provisions above and replace them with the notice
  35 * and other provisions required by the GPL. If you do not delete the
  36 * provisions above, a recipient may use your version of this file under
  37 * either the BSD or the GPL.
  38 */
  39
  40/* this big block deduces configuration from config.h */
  41#ifndef EV_STANDALONE
  42# ifdef EV_CONFIG_H
  43#  include EV_CONFIG_H
  44# else
  45#  include "config.h"
  46# endif
  47
  48# if HAVE_FLOOR
  49#  ifndef EV_USE_FLOOR
  50#   define EV_USE_FLOOR 1
  51#  endif
  52# endif
  53
  54# if HAVE_CLOCK_SYSCALL
  55#  ifndef EV_USE_CLOCK_SYSCALL
  56#   define EV_USE_CLOCK_SYSCALL 1
  57#   ifndef EV_USE_REALTIME
  58#    define EV_USE_REALTIME  0
  59#   endif
  60#   ifndef EV_USE_MONOTONIC
  61#    define EV_USE_MONOTONIC 1
  62#   endif
  63#  endif
  64# elif !defined EV_USE_CLOCK_SYSCALL
  65#  define EV_USE_CLOCK_SYSCALL 0
  66# endif
  67
  68# if HAVE_CLOCK_GETTIME
  69#  ifndef EV_USE_MONOTONIC
  70#   define EV_USE_MONOTONIC 1
  71#  endif
  72#  ifndef EV_USE_REALTIME
  73#   define EV_USE_REALTIME  0
  74#  endif
  75# else
  76#  ifndef EV_USE_MONOTONIC
  77#   define EV_USE_MONOTONIC 0
  78#  endif
  79#  ifndef EV_USE_REALTIME
  80#   define EV_USE_REALTIME  0
  81#  endif
  82# endif
  83
  84# if HAVE_NANOSLEEP
  85#  ifndef EV_USE_NANOSLEEP
  86#    define EV_USE_NANOSLEEP EV_FEATURE_OS
  87#  endif
  88# else
  89#   undef EV_USE_NANOSLEEP
  90#   define EV_USE_NANOSLEEP 0
  91# endif
  92
  93# if HAVE_SELECT && HAVE_SYS_SELECT_H
  94#  ifndef EV_USE_SELECT
  95#   define EV_USE_SELECT EV_FEATURE_BACKENDS
  96#  endif
  97# else
  98#  undef EV_USE_SELECT
  99#  define EV_USE_SELECT 0
 100# endif
 101
 102# if HAVE_POLL && HAVE_POLL_H
 103#  ifndef EV_USE_POLL
 104#   define EV_USE_POLL EV_FEATURE_BACKENDS
 105#  endif
 106# else
 107#  undef EV_USE_POLL
 108#  define EV_USE_POLL 0
 109# endif
 110   
 111# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
 112#  ifndef EV_USE_EPOLL
 113#   define EV_USE_EPOLL EV_FEATURE_BACKENDS
 114#  endif
 115# else
 116#  undef EV_USE_EPOLL
 117#  define EV_USE_EPOLL 0
 118# endif
 119   
 120# if HAVE_KQUEUE && HAVE_SYS_EVENT_H
 121#  ifndef EV_USE_KQUEUE
 122#   define EV_USE_KQUEUE EV_FEATURE_BACKENDS
 123#  endif
 124# else
 125#  undef EV_USE_KQUEUE
 126#  define EV_USE_KQUEUE 0
 127# endif
 128   
 129# if HAVE_PORT_H && HAVE_PORT_CREATE
 130#  ifndef EV_USE_PORT
 131#   define EV_USE_PORT EV_FEATURE_BACKENDS
 132#  endif
 133# else
 134#  undef EV_USE_PORT
 135#  define EV_USE_PORT 0
 136# endif
 137
 138# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
 139#  ifndef EV_USE_INOTIFY
 140#   define EV_USE_INOTIFY EV_FEATURE_OS
 141#  endif
 142# else
 143#  undef EV_USE_INOTIFY
 144#  define EV_USE_INOTIFY 0
 145# endif
 146
 147# if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
 148#  ifndef EV_USE_SIGNALFD
 149#   define EV_USE_SIGNALFD EV_FEATURE_OS
 150#  endif
 151# else
 152#  undef EV_USE_SIGNALFD
 153#  define EV_USE_SIGNALFD 0
 154# endif
 155
 156# if HAVE_EVENTFD
 157#  ifndef EV_USE_EVENTFD
 158#   define EV_USE_EVENTFD EV_FEATURE_OS
 159#  endif
 160# else
 161#  undef EV_USE_EVENTFD
 162#  define EV_USE_EVENTFD 0
 163# endif
 164 
 165#endif
 166
 167#include <stdlib.h>
 168#include <string.h>
 169#include <fcntl.h>
 170#include <stddef.h>
 171
 172#include <stdio.h>
 173
 174#include <assert.h>
 175#include <errno.h>
 176#include <sys/types.h>
 177#include <time.h>
 178#include <limits.h>
 179
 180#include <signal.h>
 181
 182#ifdef EV_H
 183# include EV_H
 184#else
 185# include "ev.h"
 186#endif
 187
 188#if EV_NO_THREADS
 189# undef EV_NO_SMP
 190# define EV_NO_SMP 1
 191# undef ECB_NO_THREADS
 192# define ECB_NO_THREADS 1
 193#endif
 194#if EV_NO_SMP
 195# undef EV_NO_SMP
 196# define ECB_NO_SMP 1
 197#endif
 198
 199#ifndef _WIN32
 200# include <sys/time.h>
 201# include <sys/wait.h>
 202# include <unistd.h>
 203#else
 204# include <io.h>
 205# define WIN32_LEAN_AND_MEAN
 206# include <winsock2.h>
 207# include <windows.h>
 208# ifndef EV_SELECT_IS_WINSOCKET
 209#  define EV_SELECT_IS_WINSOCKET 1
 210# endif
 211# undef EV_AVOID_STDIO
 212#endif
 213
 214/* OS X, in its infinite idiocy, actually HARDCODES
 215 * a limit of 1024 into their select. Where people have brains,
 216 * OS X engineers apparently have a vacuum. Or maybe they were
 217 * ordered to have a vacuum, or they do anything for money.
 218 * This might help. Or not.
 219 */
 220#define _DARWIN_UNLIMITED_SELECT 1
 221
 222/* this block tries to deduce configuration from header-defined symbols and defaults */
 223
 224/* try to deduce the maximum number of signals on this platform */
 225#if defined EV_NSIG
 226/* use what's provided */
 227#elif defined NSIG
 228# define EV_NSIG (NSIG)
 229#elif defined _NSIG
 230# define EV_NSIG (_NSIG)
 231#elif defined SIGMAX
 232# define EV_NSIG (SIGMAX+1)
 233#elif defined SIG_MAX
 234# define EV_NSIG (SIG_MAX+1)
 235#elif defined _SIG_MAX
 236# define EV_NSIG (_SIG_MAX+1)
 237#elif defined MAXSIG
 238# define EV_NSIG (MAXSIG+1)
 239#elif defined MAX_SIG
 240# define EV_NSIG (MAX_SIG+1)
 241#elif defined SIGARRAYSIZE
 242# define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
 243#elif defined _sys_nsig
 244# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
 245#else
 246# define EV_NSIG (8 * sizeof (sigset_t) + 1)
 247#endif
 248
 249#ifndef EV_USE_FLOOR
 250# define EV_USE_FLOOR 0
 251#endif
 252
 253#ifndef EV_USE_CLOCK_SYSCALL
 254# if __linux && __GLIBC__ == 2 && __GLIBC_MINOR__ < 17
 255#  define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
 256# else
 257#  define EV_USE_CLOCK_SYSCALL 0
 258# endif
 259#endif
 260
 261#if !(_POSIX_TIMERS > 0)
 262# ifndef EV_USE_MONOTONIC
 263#  define EV_USE_MONOTONIC 0
 264# endif
 265# ifndef EV_USE_REALTIME
 266#  define EV_USE_REALTIME 0
 267# endif
 268#endif
 269
 270#ifndef EV_USE_MONOTONIC
 271# if defined _POSIX_MONOTONIC_CLOCK && _POSIX_MONOTONIC_CLOCK >= 0
 272#  define EV_USE_MONOTONIC EV_FEATURE_OS
 273# else
 274#  define EV_USE_MONOTONIC 0
 275# endif
 276#endif
 277
 278#ifndef EV_USE_REALTIME
 279# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
 280#endif
 281
 282#ifndef EV_USE_NANOSLEEP
 283# if _POSIX_C_SOURCE >= 199309L
 284#  define EV_USE_NANOSLEEP EV_FEATURE_OS
 285# else
 286#  define EV_USE_NANOSLEEP 0
 287# endif
 288#endif
 289
 290#ifndef EV_USE_SELECT
 291# define EV_USE_SELECT EV_FEATURE_BACKENDS
 292#endif
 293
 294#ifndef EV_USE_POLL
 295# ifdef _WIN32
 296#  define EV_USE_POLL 0
 297# else
 298#  define EV_USE_POLL EV_FEATURE_BACKENDS
 299# endif
 300#endif
 301
 302#ifndef EV_USE_EPOLL
 303# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
 304#  define EV_USE_EPOLL EV_FEATURE_BACKENDS
 305# else
 306#  define EV_USE_EPOLL 0
 307# endif
 308#endif
 309
 310#ifndef EV_USE_KQUEUE
 311# define EV_USE_KQUEUE 0
 312#endif
 313
 314#ifndef EV_USE_PORT
 315# define EV_USE_PORT 0
 316#endif
 317
 318#ifndef EV_USE_INOTIFY
 319# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
 320#  define EV_USE_INOTIFY EV_FEATURE_OS
 321# else
 322#  define EV_USE_INOTIFY 0
 323# endif
 324#endif
 325
 326#ifndef EV_PID_HASHSIZE
 327# define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
 328#endif
 329
 330#ifndef EV_INOTIFY_HASHSIZE
 331# define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
 332#endif
 333
 334#ifndef EV_USE_EVENTFD
 335# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
 336#  define EV_USE_EVENTFD EV_FEATURE_OS
 337# else
 338#  define EV_USE_EVENTFD 0
 339# endif
 340#endif
 341
 342#ifndef EV_USE_SIGNALFD
 343# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
 344#  define EV_USE_SIGNALFD EV_FEATURE_OS
 345# else
 346#  define EV_USE_SIGNALFD 0
 347# endif
 348#endif
 349
 350#if 0 /* debugging */
 351# define EV_VERIFY 3
 352# define EV_USE_4HEAP 1
 353# define EV_HEAP_CACHE_AT 1
 354#endif
 355
 356#ifndef EV_VERIFY
 357# define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
 358#endif
 359
 360#ifndef EV_USE_4HEAP
 361# define EV_USE_4HEAP EV_FEATURE_DATA
 362#endif
 363
 364#ifndef EV_HEAP_CACHE_AT
 365# define EV_HEAP_CACHE_AT EV_FEATURE_DATA
 366#endif
 367
 368#ifdef ANDROID
 369/* supposedly, android doesn't typedef fd_mask */
 370# undef EV_USE_SELECT
 371# define EV_USE_SELECT 0
 372/* supposedly, we need to include syscall.h, not sys/syscall.h, so just disable */
 373# undef EV_USE_CLOCK_SYSCALL
 374# define EV_USE_CLOCK_SYSCALL 0
 375#endif
 376
 377/* aix's poll.h seems to cause lots of trouble */
 378#ifdef _AIX
 379/* AIX has a completely broken poll.h header */
 380# undef EV_USE_POLL
 381# define EV_USE_POLL 0
 382#endif
 383
 384/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
 385/* which makes programs even slower. might work on other unices, too. */
 386#if EV_USE_CLOCK_SYSCALL
 387# include <sys/syscall.h>
 388# ifdef SYS_clock_gettime
 389#  define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
 390#  undef EV_USE_MONOTONIC
 391#  define EV_USE_MONOTONIC 1
 392# else
 393#  undef EV_USE_CLOCK_SYSCALL
 394#  define EV_USE_CLOCK_SYSCALL 0
 395# endif
 396#endif
 397
 398/* this block fixes any misconfiguration where we know we run into trouble otherwise */
 399
 400#ifndef CLOCK_MONOTONIC
 401# undef EV_USE_MONOTONIC
 402# define EV_USE_MONOTONIC 0
 403#endif
 404
 405#ifndef CLOCK_REALTIME
 406# undef EV_USE_REALTIME
 407# define EV_USE_REALTIME 0
 408#endif
 409
 410#if !EV_STAT_ENABLE
 411# undef EV_USE_INOTIFY
 412# define EV_USE_INOTIFY 0
 413#endif
 414
 415#if !EV_USE_NANOSLEEP
 416/* hp-ux has it in sys/time.h, which we unconditionally include above */
 417# if !defined _WIN32 && !defined __hpux
 418#  include <sys/select.h>
 419# endif
 420#endif
 421
 422#if EV_USE_INOTIFY
 423# include <sys/statfs.h>
 424# include <sys/inotify.h>
 425/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
 426# ifndef IN_DONT_FOLLOW
 427#  undef EV_USE_INOTIFY
 428#  define EV_USE_INOTIFY 0
 429# endif
 430#endif
 431
 432#if EV_USE_EVENTFD
 433/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
 434# include <stdint.h>
 435# ifndef EFD_NONBLOCK
 436#  define EFD_NONBLOCK O_NONBLOCK
 437# endif
 438# ifndef EFD_CLOEXEC
 439#  ifdef O_CLOEXEC
 440#   define EFD_CLOEXEC O_CLOEXEC
 441#  else
 442#   define EFD_CLOEXEC 02000000
 443#  endif
 444# endif
 445EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
 446#endif
 447
 448#if EV_USE_SIGNALFD
 449/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
 450# include <stdint.h>
 451# ifndef SFD_NONBLOCK
 452#  define SFD_NONBLOCK O_NONBLOCK
 453# endif
 454# ifndef SFD_CLOEXEC
 455#  ifdef O_CLOEXEC
 456#   define SFD_CLOEXEC O_CLOEXEC
 457#  else
 458#   define SFD_CLOEXEC 02000000
 459#  endif
 460# endif
 461EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
 462
 463struct signalfd_siginfo
 464{
 465  uint32_t ssi_signo;
 466  char pad[128 - sizeof (uint32_t)];
 467};
 468#endif
 469
 470/**/
 471
 472#if EV_VERIFY >= 3
 473# define EV_FREQUENT_CHECK ev_verify (EV_A)
 474#else
 475# define EV_FREQUENT_CHECK do { } while (0)
 476#endif
 477
 478/*
 479 * This is used to work around floating point rounding problems.
 480 * This value is good at least till the year 4000.
 481 */
 482#define MIN_INTERVAL  0.0001220703125 /* 1/2**13, good till 4000 */
 483/*#define MIN_INTERVAL  0.00000095367431640625 /* 1/2**20, good till 2200 */
 484
 485#define MIN_TIMEJUMP  1. /* minimum timejump that gets detected (if monotonic clock available) */
 486#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
 487
 488#define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
 489#define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
 490
 491/* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
 492/* ECB.H BEGIN */
 493/*
 494 * libecb - http://software.schmorp.de/pkg/libecb
 495 *
 496 * Copyright (©) 2009-2015 Marc Alexander Lehmann <libecb@schmorp.de>
 497 * Copyright (©) 2011 Emanuele Giaquinta
 498 * All rights reserved.
 499 *
 500 * Redistribution and use in source and binary forms, with or without modifica-
 501 * tion, are permitted provided that the following conditions are met:
 502 *
 503 *   1.  Redistributions of source code must retain the above copyright notice,
 504 *       this list of conditions and the following disclaimer.
 505 *
 506 *   2.  Redistributions in binary form must reproduce the above copyright
 507 *       notice, this list of conditions and the following disclaimer in the
 508 *       documentation and/or other materials provided with the distribution.
 509 *
 510 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 511 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
 512 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
 513 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
 514 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 515 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 516 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 517 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
 518 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 519 * OF THE POSSIBILITY OF SUCH DAMAGE.
 520 *
 521 * Alternatively, the contents of this file may be used under the terms of
 522 * the GNU General Public License ("GPL") version 2 or any later version,
 523 * in which case the provisions of the GPL are applicable instead of
 524 * the above. If you wish to allow the use of your version of this file
 525 * only under the terms of the GPL and not to allow others to use your
 526 * version of this file under the BSD license, indicate your decision
 527 * by deleting the provisions above and replace them with the notice
 528 * and other provisions required by the GPL. If you do not delete the
 529 * provisions above, a recipient may use your version of this file under
 530 * either the BSD or the GPL.
 531 */
 532
 533#ifndef ECB_H
 534#define ECB_H
 535
 536/* 16 bits major, 16 bits minor */
 537#define ECB_VERSION 0x00010005
 538
 539#ifdef _WIN32
 540  typedef   signed char   int8_t;
 541  typedef unsigned char  uint8_t;
 542  typedef   signed short  int16_t;
 543  typedef unsigned short uint16_t;
 544  typedef   signed int    int32_t;
 545  typedef unsigned int   uint32_t;
 546  #if __GNUC__
 547    typedef   signed long long int64_t;
 548    typedef unsigned long long uint64_t;
 549  #else /* _MSC_VER || __BORLANDC__ */
 550    typedef   signed __int64   int64_t;
 551    typedef unsigned __int64   uint64_t;
 552  #endif
 553  #ifdef _WIN64
 554    #define ECB_PTRSIZE 8
 555    typedef uint64_t uintptr_t;
 556    typedef  int64_t  intptr_t;
 557  #else
 558    #define ECB_PTRSIZE 4
 559    typedef uint32_t uintptr_t;
 560    typedef  int32_t  intptr_t;
 561  #endif
 562#else
 563  #include <inttypes.h>
 564  #if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
 565    #define ECB_PTRSIZE 8
 566  #else
 567    #define ECB_PTRSIZE 4
 568  #endif
 569#endif
 570
 571#define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
 572#define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)
 573
 574/* work around x32 idiocy by defining proper macros */
 575#if ECB_GCC_AMD64 || ECB_MSVC_AMD64
 576  #if _ILP32
 577    #define ECB_AMD64_X32 1
 578  #else
 579    #define ECB_AMD64 1
 580  #endif
 581#endif
 582
 583/* many compilers define _GNUC_ to some versions but then only implement
 584 * what their idiot authors think are the "more important" extensions,
 585 * causing enormous grief in return for some better fake benchmark numbers.
 586 * or so.
 587 * we try to detect these and simply assume they are not gcc - if they have
 588 * an issue with that they should have done it right in the first place.
 589 */
 590#if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
 591  #define ECB_GCC_VERSION(major,minor) 0
 592#else
 593  #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
 594#endif
 595
 596#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
 597
 598#if __clang__ && defined __has_builtin
 599  #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
 600#else
 601  #define ECB_CLANG_BUILTIN(x) 0
 602#endif
 603
 604#if __clang__ && defined __has_extension
 605  #define ECB_CLANG_EXTENSION(x) __has_extension (x)
 606#else
 607  #define ECB_CLANG_EXTENSION(x) 0
 608#endif
 609
 610#define ECB_CPP   (__cplusplus+0)
 611#define ECB_CPP11 (__cplusplus >= 201103L)
 612
 613#if ECB_CPP
 614  #define ECB_C            0
 615  #define ECB_STDC_VERSION 0
 616#else
 617  #define ECB_C            1
 618  #define ECB_STDC_VERSION __STDC_VERSION__
 619#endif
 620
 621#define ECB_C99   (ECB_STDC_VERSION >= 199901L)
 622#define ECB_C11   (ECB_STDC_VERSION >= 201112L)
 623
 624#if ECB_CPP
 625  #define ECB_EXTERN_C extern "C"
 626  #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
 627  #define ECB_EXTERN_C_END }
 628#else
 629  #define ECB_EXTERN_C extern
 630  #define ECB_EXTERN_C_BEG
 631  #define ECB_EXTERN_C_END
 632#endif
 633
 634/*****************************************************************************/
 635
 636/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
 637/* ECB_NO_SMP     - ecb might be used in multiple threads, but only on a single cpu */
 638
 639#if ECB_NO_THREADS
 640  #define ECB_NO_SMP 1
 641#endif
 642
 643#if ECB_NO_SMP
 644  #define ECB_MEMORY_FENCE do { } while (0)
 645#endif
 646
 647/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
 648#if __xlC__ && ECB_CPP
 649  #include <builtins.h>
 650#endif
 651
 652#if 1400 <= _MSC_VER
 653  #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
 654#endif
 655
 656#ifndef ECB_MEMORY_FENCE
 657  #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
 658    #if __i386 || __i386__
 659      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
 660      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ (""                        : : : "memory")
 661      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
 662    #elif ECB_GCC_AMD64
 663      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mfence"   : : : "memory")
 664      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ (""         : : : "memory")
 665      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
 666    #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
 667      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("sync"     : : : "memory")
 668    #elif defined __ARM_ARCH_2__ \
 669      || defined __ARM_ARCH_3__  || defined __ARM_ARCH_3M__  \
 670      || defined __ARM_ARCH_4__  || defined __ARM_ARCH_4T__  \
 671      || defined __ARM_ARCH_5__  || defined __ARM_ARCH_5E__  \
 672      || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
 673      || defined __ARM_ARCH_5TEJ__
 674      /* should not need any, unless running old code on newer cpu - arm doesn't support that */
 675    #elif defined __ARM_ARCH_6__  || defined __ARM_ARCH_6J__  \
 676       || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
 677       || defined __ARM_ARCH_6T2__
 678      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
 679    #elif defined __ARM_ARCH_7__  || defined __ARM_ARCH_7A__  \
 680       || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
 681      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("dmb"      : : : "memory")
 682    #elif __aarch64__
 683      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("dmb ish"  : : : "memory")
 684    #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
 685      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
 686      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad"                            : : : "memory")
 687      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore             | #StoreStore")
 688    #elif defined __s390__ || defined __s390x__
 689      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("bcr 15,0" : : : "memory")
 690    #elif defined __mips__
 691      /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
 692      /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
 693      #define ECB_MEMORY_FENCE         __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
 694    #elif defined __alpha__
 695      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mb"       : : : "memory")
 696    #elif defined __hppa__
 697      #define ECB_MEMORY_FENCE         __asm__ __volatile__ (""         : : : "memory")
 698      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
 699    #elif defined __ia64__
 700      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mf"       : : : "memory")
 701    #elif defined __m68k__
 702      #define ECB_MEMORY_FENCE         __asm__ __volatile__ (""         : : : "memory")
 703    #elif defined __m88k__
 704      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
 705    #elif defined __sh__
 706      #define ECB_MEMORY_FENCE         __asm__ __volatile__ (""         : : : "memory")
 707    #endif
 708  #endif
 709#endif
 710
 711#ifndef ECB_MEMORY_FENCE
 712  #if ECB_GCC_VERSION(4,7)
 713    /* see comment below (stdatomic.h) about the C11 memory model. */
 714    #define ECB_MEMORY_FENCE         __atomic_thread_fence (__ATOMIC_SEQ_CST)
 715    #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
 716    #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
 717
 718  #elif ECB_CLANG_EXTENSION(c_atomic)
 719    /* see comment below (stdatomic.h) about the C11 memory model. */
 720    #define ECB_MEMORY_FENCE         __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
 721    #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
 722    #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
 723
 724  #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
 725    #define ECB_MEMORY_FENCE         __sync_synchronize ()
 726  #elif _MSC_VER >= 1500 /* VC++ 2008 */
 727    /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
 728    #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
 729    #define ECB_MEMORY_FENCE         _ReadWriteBarrier (); MemoryBarrier()
 730    #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
 731    #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
 732  #elif _MSC_VER >= 1400 /* VC++ 2005 */
 733    #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
 734    #define ECB_MEMORY_FENCE         _ReadWriteBarrier ()
 735    #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
 736    #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
 737  #elif defined _WIN32
 738    #include <WinNT.h>
 739    #define ECB_MEMORY_FENCE         MemoryBarrier () /* actually just xchg on x86... scary */
 740  #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
 741    #include <mbarrier.h>
 742    #define ECB_MEMORY_FENCE         __machine_rw_barrier ()
 743    #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier  ()
 744    #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier  ()
 745  #elif __xlC__
 746    #define ECB_MEMORY_FENCE         __sync ()
 747  #endif
 748#endif
 749
 750#ifndef ECB_MEMORY_FENCE
 751  #if ECB_C11 && !defined __STDC_NO_ATOMICS__
 752    /* we assume that these memory fences work on all variables/all memory accesses, */
 753    /* not just C11 atomics and atomic accesses */
 754    #include <stdatomic.h>
 755    /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
 756    /* any fence other than seq_cst, which isn't very efficient for us. */
 757    /* Why that is, we don't know - either the C11 memory model is quite useless */
 758    /* for most usages, or gcc and clang have a bug */
 759    /* I *currently* lean towards the latter, and inefficiently implement */
 760    /* all three of ecb's fences as a seq_cst fence */
 761    /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
 762    /* for all __atomic_thread_fence's except seq_cst */
 763    #define ECB_MEMORY_FENCE         atomic_thread_fence (memory_order_seq_cst)
 764  #endif
 765#endif
 766
 767#ifndef ECB_MEMORY_FENCE
 768  #if !ECB_AVOID_PTHREADS
 769    /*
 770     * if you get undefined symbol references to pthread_mutex_lock,
 771     * or failure to find pthread.h, then you should implement
 772     * the ECB_MEMORY_FENCE operations for your cpu/compiler
 773     * OR provide pthread.h and link against the posix thread library
 774     * of your system.
 775     */
 776    #include <pthread.h>
 777    #define ECB_NEEDS_PTHREADS 1
 778    #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
 779
 780    static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
 781    #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
 782  #endif
 783#endif
 784
 785#if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
 786  #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
 787#endif
 788
 789#if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
 790  #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
 791#endif
 792
 793/*****************************************************************************/
 794
 795#if ECB_CPP
 796  #define ecb_inline static inline
 797#elif ECB_GCC_VERSION(2,5)
 798  #define ecb_inline static __inline__
 799#elif ECB_C99
 800  #define ecb_inline static inline
 801#else
 802  #define ecb_inline static
 803#endif
 804
 805#if ECB_GCC_VERSION(3,3)
 806  #define ecb_restrict __restrict__
 807#elif ECB_C99
 808  #define ecb_restrict restrict
 809#else
 810  #define ecb_restrict
 811#endif
 812
 813typedef int ecb_bool;
 814
 815#define ECB_CONCAT_(a, b) a ## b
 816#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
 817#define ECB_STRINGIFY_(a) # a
 818#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
 819#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
 820
 821#define ecb_function_ ecb_inline
 822
 823#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
 824  #define ecb_attribute(attrlist)        __attribute__ (attrlist)
 825#else
 826  #define ecb_attribute(attrlist)
 827#endif
 828
 829#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
 830  #define ecb_is_constant(expr)          __builtin_constant_p (expr)
 831#else
 832  /* possible C11 impl for integral types
 833  typedef struct ecb_is_constant_struct ecb_is_constant_struct;
 834  #define ecb_is_constant(expr)          _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
 835
 836  #define ecb_is_constant(expr)          0
 837#endif
 838
 839#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
 840  #define ecb_expect(expr,value)         __builtin_expect ((expr),(value))
 841#else
 842  #define ecb_expect(expr,value)         (expr)
 843#endif
 844
 845#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
 846  #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
 847#else
 848  #define ecb_prefetch(addr,rw,locality)
 849#endif
 850
 851/* no emulation for ecb_decltype */
 852#if ECB_CPP11
 853  // older implementations might have problems with decltype(x)::type, work around it
 854  template<class T> struct ecb_decltype_t { typedef T type; };
 855  #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
 856#elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
 857  #define ecb_decltype(x) __typeof__ (x)
 858#endif
 859
 860#if _MSC_VER >= 1300
 861  #define ecb_deprecated __declspec (deprecated)
 862#else
 863  #define ecb_deprecated ecb_attribute ((__deprecated__))
 864#endif
 865
 866#if _MSC_VER >= 1500
 867  #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
 868#elif ECB_GCC_VERSION(4,5)
 869  #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
 870#else
 871  #define ecb_deprecated_message(msg) ecb_deprecated
 872#endif
 873
 874#if _MSC_VER >= 1400
 875  #define ecb_noinline __declspec (noinline)
 876#else
 877  #define ecb_noinline ecb_attribute ((__noinline__))
 878#endif
 879
 880#define ecb_unused     ecb_attribute ((__unused__))
 881#define ecb_const      ecb_attribute ((__const__))
 882#define ecb_pure       ecb_attribute ((__pure__))
 883
 884#if ECB_C11 || __IBMC_NORETURN
 885  /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
 886  #define ecb_noreturn   _Noreturn
 887#elif ECB_CPP11
 888  #define ecb_noreturn   [[noreturn]]
 889#elif _MSC_VER >= 1200
 890  /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
 891  #define ecb_noreturn   __declspec (noreturn)
 892#else
 893  #define ecb_noreturn   ecb_attribute ((__noreturn__))
 894#endif
 895
 896#if ECB_GCC_VERSION(4,3)
 897  #define ecb_artificial ecb_attribute ((__artificial__))
 898  #define ecb_hot        ecb_attribute ((__hot__))
 899  #define ecb_cold       ecb_attribute ((__cold__))
 900#else
 901  #define ecb_artificial
 902  #define ecb_hot
 903  #define ecb_cold
 904#endif
 905
 906/* put around conditional expressions if you are very sure that the  */
 907/* expression is mostly true or mostly false. note that these return */
 908/* booleans, not the expression.                                     */
 909#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
 910#define ecb_expect_true(expr)  ecb_expect (!!(expr), 1)
 911/* for compatibility to the rest of the world */
 912#define ecb_likely(expr)   ecb_expect_true  (expr)
 913#define ecb_unlikely(expr) ecb_expect_false (expr)
 914
 915/* count trailing zero bits and count # of one bits */
 916#if ECB_GCC_VERSION(3,4) \
 917    || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
 918        && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
 919        && ECB_CLANG_BUILTIN(__builtin_popcount))
 920  /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
 921  #define ecb_ld32(x)      (__builtin_clz      (x) ^ 31)
 922  #define ecb_ld64(x)      (__builtin_clzll    (x) ^ 63)
 923  #define ecb_ctz32(x)      __builtin_ctz      (x)
 924  #define ecb_ctz64(x)      __builtin_ctzll    (x)
 925  #define ecb_popcount32(x) __builtin_popcount (x)
 926  /* no popcountll */
 927#else
 928  ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
 929  ecb_function_ ecb_const int
 930  ecb_ctz32 (uint32_t x)
 931  {
 932#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
 933    unsigned long r;
 934    _BitScanForward (&r, x);
 935    return (int)r;
 936#else
 937    int r = 0;
 938
 939    x &= ~x + 1; /* this isolates the lowest bit */
 940
 941#if ECB_branchless_on_i386
 942    r += !!(x & 0xaaaaaaaa) << 0;
 943    r += !!(x & 0xcccccccc) << 1;
 944    r += !!(x & 0xf0f0f0f0) << 2;
 945    r += !!(x & 0xff00ff00) << 3;
 946    r += !!(x & 0xffff0000) << 4;
 947#else
 948    if (x & 0xaaaaaaaa) r +=  1;
 949    if (x & 0xcccccccc) r +=  2;
 950    if (x & 0xf0f0f0f0) r +=  4;
 951    if (x & 0xff00ff00) r +=  8;
 952    if (x & 0xffff0000) r += 16;
 953#endif
 954
 955    return r;
 956#endif
 957  }
 958
 959  ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
 960  ecb_function_ ecb_const int
 961  ecb_ctz64 (uint64_t x)
 962  {
 963#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
 964    unsigned long r;
 965    _BitScanForward64 (&r, x);
 966    return (int)r;
 967#else
 968    int shift = x & 0xffffffff ? 0 : 32;
 969    return ecb_ctz32 (x >> shift) + shift;
 970#endif
 971  }
 972
 973  ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
 974  ecb_function_ ecb_const int
 975  ecb_popcount32 (uint32_t x)
 976  {
 977    x -=  (x >> 1) & 0x55555555;
 978    x  = ((x >> 2) & 0x33333333) + (x & 0x33333333);
 979    x  = ((x >> 4) + x) & 0x0f0f0f0f;
 980    x *= 0x01010101;
 981
 982    return x >> 24;
 983  }
 984
 985  ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
 986  ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
 987  {
 988#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
 989    unsigned long r;
 990    _BitScanReverse (&r, x);
 991    return (int)r;
 992#else
 993    int r = 0;
 994
 995    if (x >> 16) { x >>= 16; r += 16; }
 996    if (x >>  8) { x >>=  8; r +=  8; }
 997    if (x >>  4) { x >>=  4; r +=  4; }
 998    if (x >>  2) { x >>=  2; r +=  2; }
 999    if (x >>  1) {           r +=  1; }
1000
1001    return r;
1002#endif
1003  }
1004
1005  ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
1006  ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
1007  {
1008#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
1009    unsigned long r;
1010    _BitScanReverse64 (&r, x);
1011    return (int)r;
1012#else
1013    int r = 0;
1014
1015    if (x >> 32) { x >>= 32; r += 32; }
1016
1017    return r + ecb_ld32 (x);
1018#endif
1019  }
1020#endif
1021
1022ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
1023ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
1024ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
1025ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
1026
1027ecb_function_ ecb_const uint8_t  ecb_bitrev8  (uint8_t  x);
1028ecb_function_ ecb_const uint8_t  ecb_bitrev8  (uint8_t  x)
1029{
1030  return (  (x * 0x0802U & 0x22110U)
1031          | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
1032}
1033
1034ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
1035ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
1036{
1037  x = ((x >>  1) &     0x5555) | ((x &     0x5555) <<  1);
1038  x = ((x >>  2) &     0x3333) | ((x &     0x3333) <<  2);
1039  x = ((x >>  4) &     0x0f0f) | ((x &     0x0f0f) <<  4);
1040  x = ( x >>  8              ) | ( x               <<  8);
1041
1042  return x;
1043}
1044
1045ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
1046ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
1047{
1048  x = ((x >>  1) & 0x55555555) | ((x & 0x55555555) <<  1);
1049  x = ((x >>  2) & 0x33333333) | ((x & 0x33333333) <<  2);
1050  x = ((x >>  4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) <<  4);
1051  x = ((x >>  8) & 0x00ff00ff) | ((x & 0x00ff00ff) <<  8);
1052  x = ( x >> 16              ) | ( x               << 16);
1053
1054  return x;
1055}
1056
1057/* popcount64 is only available on 64 bit cpus as gcc builtin */
1058/* so for this version we are lazy */
1059ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
1060ecb_function_ ecb_const int
1061ecb_popcount64 (uint64_t x)
1062{
1063  return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
1064}
1065
1066ecb_inline ecb_const uint8_t  ecb_rotl8  (uint8_t  x, unsigned int count);
1067ecb_inline ecb_const uint8_t  ecb_rotr8  (uint8_t  x, unsigned int count);
1068ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
1069ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
1070ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
1071ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
1072ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
1073ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
1074
1075ecb_inline ecb_const uint8_t  ecb_rotl8  (uint8_t  x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
1076ecb_inline ecb_const uint8_t  ecb_rotr8  (uint8_t  x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
1077ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
1078ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
1079ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
1080ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
1081ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
1082ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
1083
1084#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
1085  #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
1086  #define ecb_bswap16(x)  __builtin_bswap16 (x)
1087  #else
1088  #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
1089  #endif
1090  #define ecb_bswap32(x)  __builtin_bswap32 (x)
1091  #define ecb_bswap64(x)  __builtin_bswap64 (x)
1092#elif _MSC_VER
1093  #include <stdlib.h>
1094  #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
1095  #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong  ((uint32_t)(x)))
1096  #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
1097#else
1098  ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
1099  ecb_function_ ecb_const uint16_t
1100  ecb_bswap16 (uint16_t x)
1101  {
1102    return ecb_rotl16 (x, 8);
1103  }
1104
1105  ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
1106  ecb_function_ ecb_const uint32_t
1107  ecb_bswap32 (uint32_t x)
1108  {
1109    return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
1110  }
1111
1112  ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
1113  ecb_function_ ecb_const uint64_t
1114  ecb_bswap64 (uint64_t x)
1115  {
1116    return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
1117  }
1118#endif
1119
1120#if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
1121  #define ecb_unreachable() __builtin_unreachable ()
1122#else
1123  /* this seems to work fine, but gcc always emits a warning for it :/ */
1124  ecb_inline ecb_noreturn void ecb_unreachable (void);
1125  ecb_inline ecb_noreturn void ecb_unreachable (void) { }
1126#endif
1127
1128/* try to tell the compiler that some condition is definitely true */
1129#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
1130
1131ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
1132ecb_inline ecb_const uint32_t
1133ecb_byteorder_helper (void)
1134{
1135  /* the union code still generates code under pressure in gcc, */
1136  /* but less than using pointers, and always seems to */
1137  /* successfully return a constant. */
1138  /* the reason why we have this horrible preprocessor mess */
1139  /* is to avoid it in all cases, at least on common architectures */
1140  /* or when using a recent enough gcc version (>= 4.6) */
1141#if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
1142    || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
1143  #define ECB_LITTLE_ENDIAN 1
1144  return 0x44332211;
1145#elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
1146      || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
1147  #define ECB_BIG_ENDIAN 1
1148  return 0x11223344;
1149#else
1150  union
1151  {
1152    uint8_t c[4];
1153    uint32_t u;
1154  } u = { 0x11, 0x22, 0x33, 0x44 };
1155  return u.u;
1156#endif
1157}
1158
1159ecb_inline ecb_const ecb_bool ecb_big_endian    (void);
1160ecb_inline ecb_const ecb_bool ecb_big_endian    (void) { return ecb_byteorder_helper () == 0x11223344; }
1161ecb_inline ecb_const ecb_bool ecb_little_endian (void);
1162ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
1163
1164#if ECB_GCC_VERSION(3,0) || ECB_C99
1165  #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
1166#else
1167  #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
1168#endif
1169
1170#if ECB_CPP
1171  template<typename T>
1172  static inline T ecb_div_rd (T val, T div)
1173  {
1174    return val < 0 ? - ((-val + div - 1) / div) : (val          ) / div;
1175  }
1176  template<typename T>
1177  static inline T ecb_div_ru (T val, T div)
1178  {
1179    return val < 0 ? - ((-val          ) / div) : (val + div - 1) / div;
1180  }
1181#else
1182  #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val)            ) / (div))
1183  #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val)            ) / (div)) : ((val) + (div) - 1) / (div))
1184#endif
1185
1186#if ecb_cplusplus_does_not_suck
1187  /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
1188  template<typename T, int N>
1189  static inline int ecb_array_length (const T (&arr)[N])
1190  {
1191    return N;
1192  }
1193#else
1194  #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
1195#endif
1196
1197ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
1198ecb_function_ ecb_const uint32_t
1199ecb_binary16_to_binary32 (uint32_t x)
1200{
1201  unsigned int s = (x & 0x8000) << (31 - 15);
1202  int          e = (x >> 10) & 0x001f;
1203  unsigned int m =  x        & 0x03ff;
1204
1205  if (ecb_expect_false (e == 31))
1206    /* infinity or NaN */
1207    e = 255 - (127 - 15);
1208  else if (ecb_expect_false (!e))
1209    {
1210      if (ecb_expect_true (!m))
1211        /* zero, handled by code below by forcing e to 0 */
1212        e = 0 - (127 - 15);
1213      else
1214        {
1215          /* subnormal, renormalise */
1216          unsigned int s = 10 - ecb_ld32 (m);
1217
1218          m = (m << s) & 0x3ff; /* mask implicit bit */
1219          e -= s - 1;
1220        }
1221    }
1222
1223  /* e and m now are normalised, or zero, (or inf or nan) */
1224  e += 127 - 15;
1225
1226  return s | (e << 23) | (m << (23 - 10));
1227}
1228
1229ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
1230ecb_function_ ecb_const uint16_t
1231ecb_binary32_to_binary16 (uint32_t x)
1232{
1233  unsigned int s =  (x >> 16) & 0x00008000; /* sign bit, the easy part */
1234  unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
1235  unsigned int m =   x        & 0x007fffff;
1236
1237  x &= 0x7fffffff;
1238
1239  /* if it's within range of binary16 normals, use fast path */
1240  if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
1241    {
1242      /* mantissa round-to-even */
1243      m += 0x00000fff + ((m >> (23 - 10)) & 1);
1244
1245      /* handle overflow */
1246      if (ecb_expect_false (m >= 0x00800000))
1247        {
1248          m >>= 1;
1249          e +=  1;
1250        }
1251
1252      return s | (e << 10) | (m >> (23 - 10));
1253    }
1254
1255  /* handle large numbers and infinity */
1256  if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
1257    return s | 0x7c00;
1258
1259  /* handle zero, subnormals and small numbers */
1260  if (ecb_expect_true (x < 0x38800000))
1261    {
1262      /* zero */
1263      if (ecb_expect_true (!x))
1264        return s;
1265
1266      /* handle subnormals */
1267
1268      /* too small, will be zero */
1269      if (e < (14 - 24)) /* might not be sharp, but is good enough */
1270        return s;
1271
1272      m |= 0x00800000; /* make implicit bit explicit */
1273
1274      /* very tricky - we need to round to the nearest e (+10) bit value */
1275      {
1276        unsigned int bits = 14 - e;
1277        unsigned int half = (1 << (bits - 1)) - 1;
1278        unsigned int even = (m >> bits) & 1;
1279
1280        /* if this overflows, we will end up with a normalised number */
1281        m = (m + half + even) >> bits;
1282      }
1283
1284      return s | m;
1285    }
1286
1287  /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
1288  m >>= 13;
1289
1290  return s | 0x7c00 | m | !m;
1291}
1292
1293/*******************************************************************************/
1294/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
1295
1296/* basically, everything uses "ieee pure-endian" floating point numbers */
1297/* the only noteworthy exception is ancient armle, which uses order 43218765 */
1298#if 0 \
1299    || __i386 || __i386__ \
1300    || ECB_GCC_AMD64 \
1301    || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
1302    || defined __s390__ || defined __s390x__ \
1303    || defined __mips__ \
1304    || defined __alpha__ \
1305    || defined __hppa__ \
1306    || defined __ia64__ \
1307    || defined __m68k__ \
1308    || defined __m88k__ \
1309    || defined __sh__ \
1310    || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
1311    || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
1312    || defined __aarch64__
1313  #define ECB_STDFP 1
1314  #include <string.h> /* for memcpy */
1315#else
1316  #define ECB_STDFP 0
1317#endif
1318
1319#ifndef ECB_NO_LIBM
1320
1321  #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
1322
1323  /* only the oldest of old doesn't have this one. solaris. */
1324  #ifdef INFINITY
1325    #define ECB_INFINITY INFINITY
1326  #else
1327    #define ECB_INFINITY HUGE_VAL
1328  #endif
1329
1330  #ifdef NAN
1331    #define ECB_NAN NAN
1332  #else
1333    #define ECB_NAN ECB_INFINITY
1334  #endif
1335
1336  #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
1337    #define ecb_ldexpf(x,e) ldexpf ((x), (e))
1338    #define ecb_frexpf(x,e) frexpf ((x), (e))
1339  #else
1340    #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
1341    #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
1342  #endif
1343
1344  /* convert a float to ieee single/binary32 */
1345  ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
1346  ecb_function_ ecb_const uint32_t
1347  ecb_float_to_binary32 (float x)
1348  {
1349    uint32_t r;
1350
1351    #if ECB_STDFP
1352      memcpy (&r, &x, 4);
1353    #else
1354      /* slow emulation, works for anything but -0 */
1355      uint32_t m;
1356      int e;
1357
1358      if (x == 0e0f                    ) return 0x00000000U;
1359      if (x > +3.40282346638528860e+38f) return 0x7f800000U;
1360      if (x < -3.40282346638528860e+38f) return 0xff800000U;
1361      if (x != x                       ) return 0x7fbfffffU;
1362
1363      m = ecb_frexpf (x, &e) * 0x1000000U;
1364
1365      r = m & 0x80000000U;
1366
1367      if (r)
1368        m = -m;
1369
1370      if (e <= -126)
1371        {
1372          m &= 0xffffffU;
1373          m >>= (-125 - e);
1374          e = -126;
1375        }
1376
1377      r |= (e + 126) << 23;
1378      r |= m & 0x7fffffU;
1379    #endif
1380
1381    return r;
1382  }
1383
1384  /* converts an ieee single/binary32 to a float */
1385  ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
1386  ecb_function_ ecb_const float
1387  ecb_binary32_to_float (uint32_t x)
1388  {
1389    float r;
1390
1391    #if ECB_STDFP
1392      memcpy (&r, &x, 4);
1393    #else
1394      /* emulation, only works for normals and subnormals and +0 */
1395      int neg = x >> 31;
1396      int e = (x >> 23) & 0xffU;
1397
1398      x &= 0x7fffffU;
1399
1400      if (e)
1401        x |= 0x800000U;
1402      else
1403        e = 1;
1404
1405      /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
1406      r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
1407
1408      r = neg ? -r : r;
1409    #endif
1410
1411    return r;
1412  }
1413
1414  /* convert a double to ieee double/binary64 */
1415  ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
1416  ecb_function_ ecb_const uint64_t
1417  ecb_double_to_binary64 (double x)
1418  {
1419    uint64_t r;
1420
1421    #if ECB_STDFP
1422      memcpy (&r, &x, 8);
1423    #else
1424      /* slow emulation, works for anything but -0 */
1425      uint64_t m;
1426      int e;
1427
1428      if (x == 0e0                     ) return 0x0000000000000000U;
1429      if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
1430      if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
1431      if (x != x                       ) return 0X7ff7ffffffffffffU;
1432
1433      m = frexp (x, &e) * 0x20000000000000U;
1434
1435      r = m & 0x8000000000000000;;
1436
1437      if (r)
1438        m = -m;
1439
1440      if (e <= -1022)
1441        {
1442          m &= 0x1fffffffffffffU;
1443          m >>= (-1021 - e);
1444          e = -1022;
1445        }
1446
1447      r |= ((uint64_t)(e + 1022)) << 52;
1448      r |= m & 0xfffffffffffffU;
1449    #endif
1450
1451    return r;
1452  }
1453
1454  /* converts an ieee double/binary64 to a double */
1455  ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
1456  ecb_function_ ecb_const double
1457  ecb_binary64_to_double (uint64_t x)
1458  {
1459    double r;
1460
1461    #if ECB_STDFP
1462      memcpy (&r, &x, 8);
1463    #else
1464      /* emulation, only works for normals and subnormals and +0 */
1465      int neg = x >> 63;
1466      int e = (x >> 52) & 0x7ffU;
1467
1468      x &= 0xfffffffffffffU;
1469
1470      if (e)
1471        x |= 0x10000000000000U;
1472      else
1473        e = 1;
1474
1475      /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
1476      r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
1477
1478      r = neg ? -r : r;
1479    #endif
1480
1481    return r;
1482  }
1483
1484  /* convert a float to ieee half/binary16 */
1485  ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
1486  ecb_function_ ecb_const uint16_t
1487  ecb_float_to_binary16 (float x)
1488  {
1489    return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
1490  }
1491
1492  /* convert an ieee half/binary16 to float */
1493  ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
1494  ecb_function_ ecb_const float
1495  ecb_binary16_to_float (uint16_t x)
1496  {
1497    return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
1498  }
1499
1500#endif
1501
1502#endif
1503
1504/* ECB.H END */
1505
1506#if ECB_MEMORY_FENCE_NEEDS_PTHREADS
1507/* if your architecture doesn't need memory fences, e.g. because it is
1508 * single-cpu/core, or if you use libev in a project that doesn't use libev
1509 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
1510 * libev, in which cases the memory fences become nops.
1511 * alternatively, you can remove this #error and link against libpthread,
1512 * which will then provide the memory fences.
1513 */
1514# error "memory fences not defined for your architecture, please report"
1515#endif
1516
1517#ifndef ECB_MEMORY_FENCE
1518# define ECB_MEMORY_FENCE do { } while (0)
1519# define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
1520# define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
1521#endif
1522
1523#define expect_false(cond) ecb_expect_false (cond)
1524#define expect_true(cond)  ecb_expect_true  (cond)
1525#define noinline           ecb_noinline
1526
1527#define inline_size        ecb_inline
1528
1529#if EV_FEATURE_CODE
1530# define inline_speed      ecb_inline
1531#else
1532# define inline_speed      static noinline
1533#endif
1534
1535#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
1536
1537#if EV_MINPRI == EV_MAXPRI
1538# define ABSPRI(w) (((W)w), 0)
1539#else
1540# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
1541#endif
1542
1543#define EMPTY       /* required for microsofts broken pseudo-c compiler */
1544#define EMPTY2(a,b) /* used to suppress some warnings */
1545
1546typedef ev_watcher *W;
1547typedef ev_watcher_list *WL;
1548typedef ev_watcher_time *WT;
1549
1550#define ev_active(w) ((W)(w))->active
1551#define ev_at(w) ((WT)(w))->at
1552
1553#if EV_USE_REALTIME
1554/* sig_atomic_t is used to avoid per-thread variables or locking but still */
1555/* giving it a reasonably high chance of working on typical architectures */
1556static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
1557#endif
1558
1559#if EV_USE_MONOTONIC
1560static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
1561#endif
1562
1563#ifndef EV_FD_TO_WIN32_HANDLE
1564# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
1565#endif
1566#ifndef EV_WIN32_HANDLE_TO_FD
1567# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
1568#endif
1569#ifndef EV_WIN32_CLOSE_FD
1570# define EV_WIN32_CLOSE_FD(fd) close (fd)
1571#endif
1572
1573#ifdef _WIN32
1574# include "ev_win32.c"
1575#endif
1576
1577/*****************************************************************************/
1578
1579/* define a suitable floor function (only used by periodics atm) */
1580
1581#if EV_USE_FLOOR
1582# include <math.h>
1583# define ev_floor(v) floor (v)
1584#else
1585
1586#include <float.h>
1587
1588/* a floor() replacement function, should be independent of ev_tstamp type */
1589static ev_tstamp noinline
1590ev_floor (ev_tstamp v)
1591{
1592  /* the choice of shift factor is not terribly important */
1593#if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1594  const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1595#else
1596  const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1597#endif
1598
1599  /* argument too large for an unsigned long? */
1600  if (expect_false (v >= shift))
1601    {
1602      ev_tstamp f;
1603
1604      if (v == v - 1.)
1605        return v; /* very large number */
1606
1607      f = shift * ev_floor (v * (1. / shift));
1608      return f + ev_floor (v - f);
1609    }
1610
1611  /* special treatment for negative args? */
1612  if (expect_false (v < 0.))
1613    {
1614      ev_tstamp f = -ev_floor (-v);
1615
1616      return f - (f == v ? 0 : 1);
1617    }
1618
1619  /* fits into an unsigned long */
1620  return (unsigned long)v;
1621}
1622
1623#endif
1624
1625/*****************************************************************************/
1626
1627#ifdef __linux
1628# include <sys/utsname.h>
1629#endif
1630
1631static unsigned int noinline ecb_cold
1632ev_linux_version (void)
1633{
1634#ifdef __linux
1635  unsigned int v = 0;
1636  struct utsname buf;
1637  int i;
1638  char *p = buf.release;
1639
1640  if (uname (&buf))
1641    return 0;
1642
1643  for (i = 3+1; --i; )
1644    {
1645      unsigned int c = 0;
1646
1647      for (;;)
1648        {
1649          if (*p >= '0' && *p <= '9')
1650            c = c * 10 + *p++ - '0';
1651          else
1652            {
1653              p += *p == '.';
1654              break;
1655            }
1656        }
1657
1658      v = (v << 8) | c;
1659    }
1660
1661  return v;
1662#else
1663  return 0;
1664#endif
1665}
1666
1667/*****************************************************************************/
1668
1669#if EV_AVOID_STDIO
1670static void noinline ecb_cold
1671ev_printerr (const char *msg)
1672{
1673  write (STDERR_FILENO, msg, strlen (msg));
1674}
1675#endif
1676
1677static void (*syserr_cb)(const char *msg) EV_THROW;
1678
1679void ecb_cold
1680ev_set_syserr_cb (void (*cb)(const char *msg) EV_THROW) EV_THROW
1681{
1682  syserr_cb = cb;
1683}
1684
1685static void noinline ecb_cold
1686ev_syserr (const char *msg)
1687{
1688  if (!msg)
1689    msg = "(libev) system error";
1690
1691  if (syserr_cb)
1692    syserr_cb (msg);
1693  else
1694    {
1695#if EV_AVOID_STDIO
1696      ev_printerr (msg);
1697      ev_printerr (": ");
1698      ev_printerr (strerror (errno));
1699      ev_printerr ("\n");
1700#else
1701      perror (msg);
1702#endif
1703      abort ();
1704    }
1705}
1706
1707static void *
1708ev_realloc_emul (void *ptr, long size) EV_THROW
1709{
1710  /* some systems, notably openbsd and darwin, fail to properly
1711   * implement realloc (x, 0) (as required by both ansi c-89 and
1712   * the single unix specification, so work around them here.
1713   * recently, also (at least) fedora and debian started breaking it,
1714   * despite documenting it otherwise.
1715   */
1716
1717  if (size)
1718    return realloc (ptr, size);
1719
1720  free (ptr);
1721  return 0;
1722}
1723
1724static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
1725
1726void ecb_cold
1727ev_set_allocator (void *(*cb)(void *ptr, long size) EV_THROW) EV_THROW
1728{
1729  alloc = cb;
1730}
1731
1732inline_speed void *
1733ev_realloc (void *ptr, long size)
1734{
1735  ptr = alloc (ptr, size);
1736
1737  if (!ptr && size)
1738    {
1739#if EV_AVOID_STDIO
1740      ev_printerr ("(libev) memory allocation failed, aborting.\n");
1741#else
1742      fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1743#endif
1744      abort ();
1745    }
1746
1747  return ptr;
1748}
1749
1750#define ev_malloc(size) ev_realloc (0, (size))
1751#define ev_free(ptr)    ev_realloc ((ptr), 0)
1752
1753/*****************************************************************************/
1754
1755/* set in reify when reification needed */
1756#define EV_ANFD_REIFY 1
1757
1758/* file descriptor info structure */
1759typedef struct
1760{
1761  WL head;
1762  unsigned char events; /* the events watched for */
1763  unsigned char reify;  /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1764  unsigned char emask;  /* the epoll backend stores the actual kernel mask in here */
1765  unsigned char unused;
1766#if EV_USE_EPOLL
1767  unsigned int egen;    /* generation counter to counter epoll bugs */
1768#endif
1769#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1770  SOCKET handle;
1771#endif
1772#if EV_USE_IOCP
1773  OVERLAPPED or, ow;
1774#endif
1775} ANFD;
1776
1777/* stores the pending event set for a given watcher */
1778typedef struct
1779{
1780  W w;
1781  int events; /* the pending event set for the given watcher */
1782} ANPENDING;
1783
1784#if EV_USE_INOTIFY
1785/* hash table entry per inotify-id */
1786typedef struct
1787{
1788  WL head;
1789} ANFS;
1790#endif
1791
1792/* Heap Entry */
1793#if EV_HEAP_CACHE_AT
1794  /* a heap element */
1795  typedef struct {
1796    ev_tstamp at;
1797    WT w;
1798  } ANHE;
1799
1800  #define ANHE_w(he)        (he).w     /* access watcher, read-write */
1801  #define ANHE_at(he)       (he).at    /* access cached at, read-only */
1802  #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1803#else
1804  /* a heap element */
1805  typedef WT ANHE;
1806
1807  #define ANHE_w(he)        (he)
1808  #define ANHE_at(he)       (he)->at
1809  #define ANHE_at_cache(he)
1810#endif
1811
1812#if EV_MULTIPLICITY
1813
1814  struct ev_loop
1815  {
1816    ev_tstamp ev_rt_now;
1817    #define ev_rt_now ((loop)->ev_rt_now)
1818    #define VAR(name,decl) decl;
1819      #include "ev_vars.h"
1820    #undef VAR
1821  };
1822  #include "ev_wrap.h"
1823
1824  static struct ev_loop default_loop_struct;
1825  EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1826
1827#else
1828
1829  EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1830  #define VAR(name,decl) static decl;
1831    #include "ev_vars.h"
1832  #undef VAR
1833
1834  static int ev_default_loop_ptr;
1835
1836#endif
1837
1838#if EV_FEATURE_API
1839# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1840# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1841# define EV_INVOKE_PENDING invoke_cb (EV_A)
1842#else
1843# define EV_RELEASE_CB (void)0
1844# define EV_ACQUIRE_CB (void)0
1845# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1846#endif
1847
1848#define EVBREAK_RECURSE 0x80
1849
1850/*****************************************************************************/
1851
1852#ifndef EV_HAVE_EV_TIME
1853ev_tstamp
1854ev_time (void) EV_THROW
1855{
1856#if EV_USE_REALTIME
1857  if (expect_true (have_realtime))
1858    {
1859      struct timespec ts;
1860      clock_gettime (CLOCK_REALTIME, &ts);
1861      return ts.tv_sec + ts.tv_nsec * 1e-9;
1862    }
1863#endif
1864
1865  struct timeval tv;
1866  gettimeofday (&tv, 0);
1867  return tv.tv_sec + tv.tv_usec * 1e-6;
1868}
1869#endif
1870
1871inline_size ev_tstamp
1872get_clock (void)
1873{
1874#if EV_USE_MONOTONIC
1875  if (expect_true (have_monotonic))
1876    {
1877      struct timespec ts;
1878      clock_gettime (CLOCK_MONOTONIC, &ts);
1879      return ts.tv_sec + ts.tv_nsec * 1e-9;
1880    }
1881#endif
1882
1883  return ev_time ();
1884}
1885
1886#if EV_MULTIPLICITY
1887ev_tstamp
1888ev_now (EV_P) EV_THROW
1889{
1890  return ev_rt_now;
1891}
1892#endif
1893
1894void
1895ev_sleep (ev_tstamp delay) EV_THROW
1896{
1897  if (delay > 0.)
1898    {
1899#if EV_USE_NANOSLEEP
1900      struct timespec ts;
1901
1902      EV_TS_SET (ts, delay);
1903      nanosleep (&ts, 0);
1904#elif defined _WIN32
1905      Sleep ((unsigned long)(delay * 1e3));
1906#else
1907      struct timeval tv;
1908
1909      /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1910      /* something not guaranteed by newer posix versions, but guaranteed */
1911      /* by older ones */
1912      EV_TV_SET (tv, delay);
1913      select (0, 0, 0, 0, &tv);
1914#endif
1915    }
1916}
1917
1918/*****************************************************************************/
1919
1920#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
1921
1922/* find a suitable new size for the given array, */
1923/* hopefully by rounding to a nice-to-malloc size */
1924inline_size int
1925array_nextsize (int elem, int cur, int cnt)
1926{
1927  int ncur = cur + 1;
1928
1929  do
1930    ncur <<= 1;
1931  while (cnt > ncur);
1932
1933  /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1934  if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
1935    {
1936      ncur *= elem;
1937      ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1938      ncur = ncur - sizeof (void *) * 4;
1939      ncur /= elem;
1940    }
1941
1942  return ncur;
1943}
1944
1945static void * noinline ecb_cold
1946array_realloc (int elem, void *base, int *cur, int cnt)
1947{
1948  *cur = array_nextsize (elem, *cur, cnt);
1949  return ev_realloc (base, elem * *cur);
1950}
1951
1952#define array_init_zero(base,count)	\
1953  memset ((void *)(base), 0, sizeof (*(base)) * (count))
1954
1955#define array_needsize(type,base,cur,cnt,init)			\
1956  if (expect_false ((cnt) > (cur)))				\
1957    {								\
1958      int ecb_unused ocur_ = (cur);					\
1959      (base) = (type *)array_realloc				\
1960         (sizeof (type), (base), &(cur), (cnt));		\
1961      init ((base) + (ocur_), (cur) - ocur_);			\
1962    }
1963
1964#if 0
1965#define array_slim(type,stem)					\
1966  if (stem ## max < array_roundsize (stem ## cnt >> 2))		\
1967    {								\
1968      stem ## max = array_roundsize (stem ## cnt >> 1);		\
1969      base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1970      fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1971    }
1972#endif
1973
1974#define array_free(stem, idx) \
1975  ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1976
1977/*****************************************************************************/
1978
1979/* dummy callback for pending events */
1980static void noinline
1981pendingcb (EV_P_ ev_prepare *w, int revents)
1982{
1983}
1984
1985void noinline
1986ev_feed_event (EV_P_ void *w, int revents) EV_THROW
1987{
1988  W w_ = (W)w;
1989  int pri = ABSPRI (w_);
1990
1991  if (expect_false (w_->pending))
1992    pendings [pri][w_->pending - 1].events |= revents;
1993  else
1994    {
1995      w_->pending = ++pendingcnt [pri];
1996      array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1997      pendings [pri][w_->pending - 1].w      = w_;
1998      pendings [pri][w_->pending - 1].events = revents;
1999    }
2000
2001  pendingpri = NUMPRI - 1;
2002}
2003
2004inline_speed void
2005feed_reverse (EV_P_ W w)
2006{
2007  array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
2008  rfeeds [rfeedcnt++] = w;
2009}
2010
2011inline_size void
2012feed_reverse_done (EV_P_ int revents)
2013{
2014  do
2015    ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
2016  while (rfeedcnt);
2017}
2018
2019inline_speed void
2020queue_events (EV_P_ W *events, int eventcnt, int type)
2021{
2022  int i;
2023
2024  for (i = 0; i < eventcnt; ++i)
2025    ev_feed_event (EV_A_ events [i], type);
2026}
2027
2028/*****************************************************************************/
2029
2030inline_speed void
2031fd_event_nocheck (EV_P_ int fd, int revents)
2032{
2033  ANFD *anfd = anfds + fd;
2034  ev_io *w;
2035
2036  for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
2037    {
2038      int ev = w->events & revents;
2039
2040      if (ev)
2041        ev_feed_event (EV_A_ (W)w, ev);
2042    }
2043}
2044
2045/* do not submit kernel events for fds that have reify set */
2046/* because that means they changed while we were polling for new events */
2047inline_speed void
2048fd_event (EV_P_ int fd, int revents)
2049{
2050  ANFD *anfd = anfds + fd;
2051
2052  if (expect_true (!anfd->reify))
2053    fd_event_nocheck (EV_A_ fd, revents);
2054}
2055
2056void
2057ev_feed_fd_event (EV_P_ int fd, int revents) EV_THROW
2058{
2059  if (fd >= 0 && fd < anfdmax)
2060    fd_event_nocheck (EV_A_ fd, revents);
2061}
2062
2063/* make sure the external fd watch events are in-sync */
2064/* with the kernel/libev internal state */
2065inline_size void
2066fd_reify (EV_P)
2067{
2068  int i;
2069
2070#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
2071  for (i = 0; i < fdchangecnt; ++i)
2072    {
2073      int fd = fdchanges [i];
2074      ANFD *anfd = anfds + fd;
2075
2076      if (anfd->reify & EV__IOFDSET && anfd->head)
2077        {
2078          SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
2079
2080          if (handle != anfd->handle)
2081            {
2082              unsigned long arg;
2083
2084              assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
2085
2086              /* handle changed, but fd didn't - we need to do it in two steps */
2087              backend_modify (EV_A_ fd, anfd->events, 0);
2088              anfd->events = 0;
2089              anfd->handle = handle;
2090            }
2091        }
2092    }
2093#endif
2094
2095  for (i = 0; i < fdchangecnt; ++i)
2096    {
2097      int fd = fdchanges [i];
2098      ANFD *anfd = anfds + fd;
2099      ev_io *w;
2100
2101      unsigned char o_events = anfd->events;
2102      unsigned char o_reify  = anfd->reify;
2103
2104      anfd->reify  = 0;
2105
2106      /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
2107        {
2108          anfd->events = 0;
2109
2110          for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
2111            anfd->events |= (unsigned char)w->events;
2112
2113          if (o_events != anfd->events)
2114            o_reify = EV__IOFDSET; /* actually |= */
2115        }
2116
2117      if (o_reify & EV__IOFDSET)
2118        backend_modify (EV_A_ fd, o_events, anfd->events);
2119    }
2120
2121  fdchangecnt = 0;
2122}
2123
2124/* something about the given fd changed */
2125inline_size void
2126fd_change (EV_P_ int fd, int flags)
2127{
2128  unsigned char reify = anfds [fd].reify;
2129  anfds [fd].reify |= flags;
2130
2131  if (expect_true (!reify))
2132    {
2133      ++fdchangecnt;
2134      array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
2135      fdchanges [fdchangecnt - 1] = fd;
2136    }
2137}
2138
2139/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
2140inline_speed void ecb_cold
2141fd_kill (EV_P_ int fd)
2142{
2143  ev_io *w;
2144
2145  while ((w = (ev_io *)anfds [fd].head))
2146    {
2147      ev_io_stop (EV_A_ w);
2148      ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
2149    }
2150}
2151
2152/* check whether the given fd is actually valid, for error recovery */
2153inline_size int ecb_cold
2154fd_valid (int fd)
2155{
2156#ifdef _WIN32
2157  return EV_FD_TO_WIN32_HANDLE (fd) != -1;
2158#else
2159  return fcntl (fd, F_GETFD) != -1;
2160#endif
2161}
2162
2163/* called on EBADF to verify fds */
2164static void noinline ecb_cold
2165fd_ebadf (EV_P)
2166{
2167  int fd;
2168
2169  for (fd = 0; fd < anfdmax; ++fd)
2170    if (anfds [fd].events)
2171      if (!fd_valid (fd) && errno == EBADF)
2172        fd_kill (EV_A_ fd);
2173}
2174
2175/* called on ENOMEM in select/poll to kill some fds and retry */
2176static void noinline ecb_cold
2177fd_enomem (EV_P)
2178{
2179  int fd;
2180
2181  for (fd = anfdmax; fd--; )
2182    if (anfds [fd].events)
2183      {
2184        fd_kill (EV_A_ fd);
2185        break;
2186      }
2187}
2188
2189/* usually called after fork if backend needs to re-arm all fds from scratch */
2190static void noinline
2191fd_rearm_all (EV_P)
2192{
2193  int fd;
2194
2195  for (fd = 0; fd < anfdmax; ++fd)
2196    if (anfds [fd].events)
2197      {
2198        anfds [fd].events = 0;
2199        anfds [fd].emask  = 0;
2200        fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
2201      }
2202}
2203
2204/* used to prepare libev internal fd's */
2205/* this is not fork-safe */
2206inline_speed void
2207fd_intern (int fd)
2208{
2209#ifdef _WIN32
2210  unsigned long arg = 1;
2211  ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
2212#else
2213  fcntl (fd, F_SETFD, FD_CLOEXEC);
2214  fcntl (fd, F_SETFL, O_NONBLOCK);
2215#endif
2216}
2217
2218/*****************************************************************************/
2219
2220/*
2221 * the heap functions want a real array index. array index 0 is guaranteed to not
2222 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
2223 * the branching factor of the d-tree.
2224 */
2225
2226/*
2227 * at the moment we allow libev the luxury of two heaps,
2228 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
2229 * which is more cache-efficient.
2230 * the difference is about 5% with 50000+ watchers.
2231 */
2232#if EV_USE_4HEAP
2233
2234#define DHEAP 4
2235#define HEAP0 (DHEAP - 1) /* index of first element in heap */
2236#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
2237#define UPHEAP_DONE(p,k) ((p) == (k))
2238
2239/* away from the root */
2240inline_speed void
2241downheap (ANHE *heap, int N, int k)
2242{
2243  ANHE he = heap [k];
2244  ANHE *E = heap + N + HEAP0;
2245
2246  for (;;)
2247    {
2248      ev_tstamp minat;
2249      ANHE *minpos;
2250      ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
2251
2252      /* find minimum child */
2253      if (expect_true (pos + DHEAP - 1 < E))
2254        {
2255          /* fast path */                               (minpos = pos + 0), (minat = ANHE_at (*minpos));
2256          if (               ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
2257          if (               ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
2258          if (               ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
2259        }
2260      else if (pos < E)
2261        {
2262          /* slow path */                               (minpos = pos + 0), (minat = ANHE_at (*minpos));
2263          if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
2264          if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
2265          if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
2266        }
2267      else
2268        break;
2269
2270      if (ANHE_at (he) <= minat)
2271        break;
2272
2273      heap [k] = *minpos;
2274      ev_active (ANHE_w (*minpos)) = k;
2275
2276      k = minpos - heap;
2277    }
2278
2279  heap [k] = he;
2280  ev_active (ANHE_w (he)) = k;
2281}
2282
2283#else /* 4HEAP */
2284
2285#define HEAP0 1
2286#define HPARENT(k) ((k) >> 1)
2287#define UPHEAP_DONE(p,k) (!(p))
2288
2289/* away from the root */
2290inline_speed void
2291downheap (ANHE *heap, int N, int k)
2292{
2293  ANHE he = heap [k];
2294
2295  for (;;)
2296    {
2297      int c = k << 1;
2298
2299      if (c >= N + HEAP0)
2300        break;
2301
2302      c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
2303           ? 1 : 0;
2304
2305      if (ANHE_at (he) <= ANHE_at (heap [c]))
2306        break;
2307
2308      heap [k] = heap [c];
2309      ev_active (ANHE_w (heap [k])) = k;
2310      
2311      k = c;
2312    }
2313
2314  heap [k] = he;
2315  ev_active (ANHE_w (he)) = k;
2316}
2317#endif
2318
2319/* towards the root */
2320inline_speed void
2321upheap (ANHE *heap, int k)
2322{
2323  ANHE he = heap [k];
2324
2325  for (;;)
2326    {
2327      int p = HPARENT (k);
2328
2329      if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
2330        break;
2331
2332      heap [k] = heap [p];
2333      ev_active (ANHE_w (heap [k])) = k;
2334      k = p;
2335    }
2336
2337  heap [k] = he;
2338  ev_active (ANHE_w (he)) = k;
2339}
2340
2341/* move an element suitably so it is in a correct place */
2342inline_size void
2343adjustheap (ANHE *heap, int N, int k)
2344{
2345  if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
2346    upheap (heap, k);
2347  else
2348    downheap (heap, N, k);
2349}
2350
2351/* rebuild the heap: this function is used only once and executed rarely */
2352inline_size void
2353reheap (ANHE *heap, int N)
2354{
2355  int i;
2356
2357  /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
2358  /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
2359  for (i = 0; i < N; ++i)
2360    upheap (heap, i + HEAP0);
2361}
2362
2363/*****************************************************************************/
2364
2365/* associate signal watchers to a signal signal */
2366typedef struct
2367{
2368  EV_ATOMIC_T pending;
2369#if EV_MULTIPLICITY
2370  EV_P;
2371#endif
2372  WL head;
2373} ANSIG;
2374
2375static ANSIG signals [EV_NSIG - 1];
2376
2377/*****************************************************************************/
2378
2379#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2380
2381static void noinline ecb_cold
2382evpipe_init (EV_P)
2383{
2384  if (!ev_is_active (&pipe_w))
2385    {
2386      int fds [2];
2387
2388# if EV_USE_EVENTFD
2389      fds [0] = -1;
2390      fds [1] = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
2391      if (fds [1] < 0 && errno == EINVAL)
2392        fds [1] = eventfd (0, 0);
2393
2394      if (fds [1] < 0)
2395# endif
2396        {
2397          while (pipe (fds))
2398            ev_syserr ("(libev) error creating signal/async pipe");
2399
2400          fd_intern (fds [0]);
2401        }
2402
2403      evpipe [0] = fds [0];
2404
2405      if (evpipe [1] < 0)
2406        evpipe [1] = fds [1]; /* first call, set write fd */
2407      else
2408        {
2409          /* on subsequent calls, do not change evpipe [1] */
2410          /* so that evpipe_write can always rely on its value. */
2411          /* this branch does not do anything sensible on windows, */
2412          /* so must not be executed on windows */
2413
2414          dup2 (fds [1], evpipe [1]);
2415          close (fds [1]);
2416        }
2417
2418      fd_intern (evpipe [1]);
2419
2420      ev_io_set (&pipe_w, evpipe [0] < 0 ? evpipe [1] : evpipe [0], EV_READ);
2421      ev_io_start (EV_A_ &pipe_w);
2422      ev_unref (EV_A); /* watcher should not keep loop alive */
2423    }
2424}
2425
2426inline_speed void
2427evpipe_write (EV_P_ EV_ATOMIC_T *flag)
2428{
2429  ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */
2430
2431  if (expect_true (*flag))
2432    return;
2433
2434  *flag = 1;
2435  ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
2436
2437  pipe_write_skipped = 1;
2438
2439  ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
2440
2441  if (pipe_write_wanted)
2442    {
2443      int old_errno;
2444
2445      pipe_write_skipped = 0;
2446      ECB_MEMORY_FENCE_RELEASE;
2447
2448      old_errno = errno; /* save errno because write will clobber it */
2449
2450#if EV_USE_EVENTFD
2451      if (evpipe [0] < 0)
2452        {
2453          uint64_t counter = 1;
2454          write (evpipe [1], &counter, sizeof (uint64_t));
2455        }
2456      else
2457#endif
2458        {
2459#ifdef _WIN32
2460          WSABUF buf;
2461          DWORD sent;
2462          buf.buf = &buf;
2463          buf.len = 1;
2464          WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
2465#else
2466          write (evpipe [1], &(evpipe [1]), 1);
2467#endif
2468        }
2469
2470      errno = old_errno;
2471    }
2472}
2473
2474/* called whenever the libev signal pipe */
2475/* got some events (signal, async) */
2476static void
2477pipecb (EV_P_ ev_io *iow, int revents)
2478{
2479  int i;
2480
2481  if (revents & EV_READ)
2482    {
2483#if EV_USE_EVENTFD
2484      if (evpipe [0] < 0)
2485        {
2486          uint64_t counter;
2487          read (evpipe [1], &counter, sizeof (uint64_t));
2488        }
2489      else
2490#endif
2491        {
2492          char dummy[4];
2493#ifdef _WIN32
2494          WSABUF buf;
2495          DWORD recvd;
2496          DWORD flags = 0;
2497          buf.buf = dummy;
2498          buf.len = sizeof (dummy);
2499          WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, &flags, 0, 0);
2500#else
2501          read (evpipe [0], &dummy, sizeof (dummy));
2502#endif
2503        }
2504    }
2505
2506  pipe_write_skipped = 0;
2507
2508  ECB_MEMORY_FENCE; /* push out skipped, acquire flags */
2509
2510#if EV_SIGNAL_ENABLE
2511  if (sig_pending)
2512    {
2513      sig_pending = 0;
2514
2515      ECB_MEMORY_FENCE;
2516
2517      for (i = EV_NSIG - 1; i--; )
2518        if (expect_false (signals [i].pending))
2519          ev_feed_signal_event (EV_A_ i + 1);
2520    }
2521#endif
2522
2523#if EV_ASYNC_ENABLE
2524  if (async_pending)
2525    {
2526      async_pending = 0;
2527
2528      ECB_MEMORY_FENCE;
2529
2530      for (i = asynccnt; i--; )
2531        if (asyncs [i]->sent)
2532          {
2533            asyncs [i]->sent = 0;
2534            ECB_MEMORY_FENCE_RELEASE;
2535            ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
2536          }
2537    }
2538#endif
2539}
2540
2541/*****************************************************************************/
2542
2543void
2544ev_feed_signal (int signum) EV_THROW
2545{
2546#if EV_MULTIPLICITY
2547  EV_P;
2548  ECB_MEMORY_FENCE_ACQUIRE;
2549  EV_A = signals [signum - 1].loop;
2550
2551  if (!EV_A)
2552    return;
2553#endif
2554
2555  signals [signum - 1].pending = 1;
2556  evpipe_write (EV_A_ &sig_pending);
2557}
2558
2559static void
2560ev_sighandler (int signum)
2561{
2562#ifdef _WIN32
2563  signal (signum, ev_sighandler);
2564#endif
2565
2566  ev_feed_signal (signum);
2567}
2568
2569void noinline
2570ev_feed_signal_event (EV_P_ int signum) EV_THROW
2571{
2572  WL w;
2573
2574  if (expect_false (signum <= 0 || signum >= EV_NSIG))
2575    return;
2576
2577  --signum;
2578
2579#if EV_MULTIPLICITY
2580  /* it is permissible to try to feed a signal to the wrong loop */
2581  /* or, likely more useful, feeding a signal nobody is waiting for */
2582
2583  if (expect_false (signals [signum].loop != EV_A))
2584    return;
2585#endif
2586
2587  signals [signum].pending = 0;
2588  ECB_MEMORY_FENCE_RELEASE;
2589
2590  for (w = signals [signum].head; w; w = w->next)
2591    ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
2592}
2593
2594#if EV_USE_SIGNALFD
2595static void
2596sigfdcb (EV_P_ ev_io *iow, int revents)
2597{
2598  struct signalfd_siginfo si[2], *sip; /* these structs are big */
2599
2600  for (;;)
2601    {
2602      ssize_t res = read (sigfd, si, sizeof (si));
2603
2604      /* not ISO-C, as res might be -1, but works with SuS */
2605      for (sip = si; (char *)sip < (char *)si + res; ++sip)
2606        ev_feed_signal_event (EV_A_ sip->ssi_signo);
2607
2608      if (res < (ssize_t)sizeof (si))
2609        break;
2610    }
2611}
2612#endif
2613
2614#endif
2615
2616/*****************************************************************************/
2617
2618#if EV_CHILD_ENABLE
2619static WL childs [EV_PID_HASHSIZE];
2620
2621static ev_signal childev;
2622
2623#ifndef WIFCONTINUED
2624# define WIFCONTINUED(status) 0
2625#endif
2626
2627/* handle a single child status event */
2628inline_speed void
2629child_reap (EV_P_ int chain, int pid, int status)
2630{
2631  ev_child *w;
2632  int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2633
2634  for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2635    {
2636      if ((w->pid == pid || !w->pid)
2637          && (!traced || (w->flags & 1)))
2638        {
2639          ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2640          w->rpid    = pid;
2641          w->rstatus = status;
2642          ev_feed_event (EV_A_ (W)w, EV_CHILD);
2643        }
2644    }
2645}
2646
2647#ifndef WCONTINUED
2648# define WCONTINUED 0
2649#endif
2650
2651/* called on sigchld etc., calls waitpid */
2652static void
2653childcb (EV_P_ ev_signal *sw, int revents)
2654{
2655  int pid, status;
2656
2657  /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
2658  if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
2659    if (!WCONTINUED
2660        || errno != EINVAL
2661        || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
2662      return;
2663
2664  /* make sure we are called again until all children have been reaped */
2665  /* we need to do it this way so that the callback gets called before we continue */
2666  ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
2667
2668  child_reap (EV_A_ pid, pid, status);
2669  if ((EV_PID_HASHSIZE) > 1)
2670    child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
2671}
2672
2673#endif
2674
2675/*****************************************************************************/
2676
2677#if EV_USE_IOCP
2678# include "ev_iocp.c"
2679#endif
2680#if EV_USE_PORT
2681# include "ev_port.c"
2682#endif
2683#if EV_USE_KQUEUE
2684# include "ev_kqueue.c"
2685#endif
2686#if EV_USE_EPOLL
2687# include "ev_epoll.c"
2688#endif
2689#if EV_USE_POLL
2690# include "ev_poll.c"
2691#endif
2692#if EV_USE_SELECT
2693# include "ev_select.c"
2694#endif
2695
2696int ecb_cold
2697ev_version_major (void) EV_THROW
2698{
2699  return EV_VERSION_MAJOR;
2700}
2701
2702int ecb_cold
2703ev_version_minor (void) EV_THROW
2704{
2705  return EV_VERSION_MINOR;
2706}
2707
2708/* return true if we are running with elevated privileges and should ignore env variables */
2709int inline_size ecb_cold
2710enable_secure (void)
2711{
2712#ifdef _WIN32
2713  return 0;
2714#else
2715  return getuid () != geteuid ()
2716      || getgid () != getegid ();
2717#endif
2718}
2719
2720unsigned int ecb_cold
2721ev_supported_backends (void) EV_THROW
2722{
2723  unsigned int flags = 0;
2724
2725  if (EV_USE_PORT  ) flags |= EVBACKEND_PORT;
2726  if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2727  if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2728  if (EV_USE_POLL  ) flags |= EVBACKEND_POLL;
2729  if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2730  
2731  return flags;
2732}
2733
2734unsigned int ecb_cold
2735ev_recommended_backends (void) EV_THROW
2736{
2737  unsigned int flags = ev_supported_backends ();
2738
2739#ifndef __NetBSD__
2740  /* kqueue is borked on everything but netbsd apparently */
2741  /* it usually doesn't work correctly on anything but sockets and pipes */
2742  flags &= ~EVBACKEND_KQUEUE;
2743#endif
2744#ifdef __APPLE__
2745  /* only select works correctly on that "unix-certified" platform */
2746  flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2747  flags &= ~EVBACKEND_POLL;   /* poll is based on kqueue from 10.5 onwards */
2748#endif
2749#ifdef __FreeBSD__
2750  flags &= ~EVBACKEND_POLL;   /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2751#endif
2752
2753  return flags;
2754}
2755
2756unsigned int ecb_cold
2757ev_embeddable_backends (void) EV_THROW
2758{
2759  int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2760
2761  /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2762  if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2763    flags &= ~EVBACKEND_EPOLL;
2764
2765  return flags;
2766}
2767
2768unsigned int
2769ev_backend (EV_P) EV_THROW
2770{
2771  return backend;
2772}
2773
2774#if EV_FEATURE_API
2775unsigned int
2776ev_iteration (EV_P) EV_THROW
2777{
2778  return loop_count;
2779}
2780
2781unsigned int
2782ev_depth (EV_P) EV_THROW
2783{
2784  return loop_depth;
2785}
2786
2787void
2788ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2789{
2790  io_blocktime = interval;
2791}
2792
2793void
2794ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2795{
2796  timeout_blocktime = interval;
2797}
2798
2799void
2800ev_set_userdata (EV_P_ void *data) EV_THROW
2801{
2802  userdata = data;
2803}
2804
2805void *
2806ev_userdata (EV_P) EV_THROW
2807{
2808  return userdata;
2809}
2810
2811void
2812ev_set_invoke_pending_cb (EV_P_ ev_loop_callback invoke_pending_cb) EV_THROW
2813{
2814  invoke_cb = invoke_pending_cb;
2815}
2816
2817void
2818ev_set_loop_release_cb (EV_P_ void (*release)(EV_P) EV_THROW, void (*acquire)(EV_P) EV_THROW) EV_THROW
2819{
2820  release_cb = release;
2821  acquire_cb = acquire;
2822}
2823#endif
2824
2825/* initialise a loop structure, must be zero-initialised */
2826static void noinline ecb_cold
2827loop_init (EV_P_ unsigned int flags) EV_THROW
2828{
2829  if (!backend)
2830    {
2831      origflags = flags;
2832
2833#if EV_USE_REALTIME
2834      if (!have_realtime)
2835        {
2836          struct timespec ts;
2837
2838          if (!clock_gettime (CLOCK_REALTIME, &ts))
2839            have_realtime = 1;
2840        }
2841#endif
2842
2843#if EV_USE_MONOTONIC
2844      if (!have_monotonic)
2845        {
2846          struct timespec ts;
2847
2848          if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2849            have_monotonic = 1;
2850        }
2851#endif
2852
2853      /* pid check not overridable via env */
2854#ifndef _WIN32
2855      if (flags & EVFLAG_FORKCHECK)
2856        curpid = getpid ();
2857#endif
2858
2859      if (!(flags & EVFLAG_NOENV)
2860          && !enable_secure ()
2861          && getenv ("LIBEV_FLAGS"))
2862        flags = atoi (getenv ("LIBEV_FLAGS"));
2863
2864      ev_rt_now          = ev_time ();
2865      mn_now             = get_clock ();
2866      now_floor          = mn_now;
2867      rtmn_diff          = ev_rt_now - mn_now;
2868#if EV_FEATURE_API
2869      invoke_cb          = ev_invoke_pending;
2870#endif
2871
2872      io_blocktime       = 0.;
2873      timeout_blocktime  = 0.;
2874      backend            = 0;
2875      backend_fd         = -1;
2876      sig_pending        = 0;
2877#if EV_ASYNC_ENABLE
2878      async_pending      = 0;
2879#endif
2880      pipe_write_skipped = 0;
2881      pipe_write_wanted  = 0;
2882      evpipe [0]         = -1;
2883      evpipe [1]         = -1;
2884#if EV_USE_INOTIFY
2885      fs_fd              = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2886#endif
2887#if EV_USE_SIGNALFD
2888      sigfd              = flags & EVFLAG_SIGNALFD  ? -2 : -1;
2889#endif
2890
2891      if (!(flags & EVBACKEND_MASK))
2892        flags |= ev_recommended_backends ();
2893
2894#if EV_USE_IOCP
2895      if (!backend && (flags & EVBACKEND_IOCP  )) backend = iocp_init   (EV_A_ flags);
2896#endif
2897#if EV_USE_PORT
2898      if (!backend && (flags & EVBACKEND_PORT  )) backend = port_init   (EV_A_ flags);
2899#endif
2900#if EV_USE_KQUEUE
2901      if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2902#endif
2903#if EV_USE_EPOLL
2904      if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init  (EV_A_ flags);
2905#endif
2906#if EV_USE_POLL
2907      if (!backend && (flags & EVBACKEND_POLL  )) backend = poll_init   (EV_A_ flags);
2908#endif
2909#if EV_USE_SELECT
2910      if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2911#endif
2912
2913      ev_prepare_init (&pending_w, pendingcb);
2914
2915#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2916      ev_init (&pipe_w, pipecb);
2917      ev_set_priority (&pipe_w, EV_MAXPRI);
2918#endif
2919    }
2920}
2921
2922/* free up a loop structure */
2923void ecb_cold
2924ev_loop_destroy (EV_P)
2925{
2926  int i;
2927
2928#if EV_MULTIPLICITY
2929  /* mimic free (0) */
2930  if (!EV_A)
2931    return;
2932#endif
2933
2934#if EV_CLEANUP_ENABLE
2935  /* queue cleanup watchers (and execute them) */
2936  if (expect_false (cleanupcnt))
2937    {
2938      queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2939      EV_INVOKE_PENDING;
2940    }
2941#endif
2942
2943#if EV_CHILD_ENABLE
2944  if (ev_is_default_loop (EV_A) && ev_is_active (&childev))
2945    {
2946      ev_ref (EV_A); /* child watcher */
2947      ev_signal_stop (EV_A_ &childev);
2948    }
2949#endif
2950
2951  if (ev_is_active (&pipe_w))
2952    {
2953      /*ev_ref (EV_A);*/
2954      /*ev_io_stop (EV_A_ &pipe_w);*/
2955
2956      if (evpipe [0] >= 0) EV_WIN32_CLOSE_FD (evpipe [0]);
2957      if (evpipe [1] >= 0) EV_WIN32_CLOSE_FD (evpipe [1]);
2958    }
2959
2960#if EV_USE_SIGNALFD
2961  if (ev_is_active (&sigfd_w))
2962    close (sigfd);
2963#endif
2964
2965#if EV_USE_INOTIFY
2966  if (fs_fd >= 0)
2967    close (fs_fd);
2968#endif
2969
2970  if (backend_fd >= 0)
2971    close (backend_fd);
2972
2973#if EV_USE_IOCP
2974  if (backend == EVBACKEND_IOCP  ) iocp_destroy   (EV_A);
2975#endif
2976#if EV_USE_PORT
2977  if (backend == EVBACKEND_PORT  ) port_destroy   (EV_A);
2978#endif
2979#if EV_USE_KQUEUE
2980  if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2981#endif
2982#if EV_USE_EPOLL
2983  if (backend == EVBACKEND_EPOLL ) epoll_destroy  (EV_A);
2984#endif
2985#if EV_USE_POLL
2986  if (backend == EVBACKEND_POLL  ) poll_destroy   (EV_A);
2987#endif
2988#if EV_USE_SELECT
2989  if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2990#endif
2991
2992  for (i = NUMPRI; i--; )
2993    {
2994      array_free (pending, [i]);
2995#if EV_IDLE_ENABLE
2996      array_free (idle, [i]);
2997#endif
2998    }
2999
3000  ev_free (anfds); anfds = 0; anfdmax = 0;
3001
3002  /* have to use the microsoft-never-gets-it-right macro */
3003  array_free (rfeed, EMPTY);
3004  array_free (fdchange, EMPTY);
3005  array_free (timer, EMPTY);
3006#if EV_PERIODIC_ENABLE
3007  array_free (periodic, EMPTY);
3008#endif
3009#if EV_FORK_ENABLE
3010  array_free (fork, EMPTY);
3011#endif
3012#if EV_CLEANUP_ENABLE
3013  array_free (cleanup, EMPTY);
3014#endif
3015  array_free (prepare, EMPTY);
3016  array_free (check, EMPTY);
3017#if EV_ASYNC_ENABLE
3018  array_free (async, EMPTY);
3019#endif
3020
3021  backend = 0;
3022
3023#if EV_MULTIPLICITY
3024  if (ev_is_default_loop (EV_A))
3025#endif
3026    ev_default_loop_ptr = 0;
3027#if EV_MULTIPLICITY
3028  else
3029    ev_free (EV_A);
3030#endif
3031}
3032
3033#if EV_USE_INOTIFY
3034inline_size void infy_fork (EV_P);
3035#endif
3036
3037inline_size void
3038loop_fork (EV_P)
3039{
3040#if EV_USE_PORT
3041  if (backend == EVBACKEND_PORT  ) port_fork   (EV_A);
3042#endif
3043#if EV_USE_KQUEUE
3044  if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
3045#endif
3046#if EV_USE_EPOLL
3047  if (backend == EVBACKEND_EPOLL ) epoll_fork  (EV_A);
3048#endif
3049#if EV_USE_INOTIFY
3050  infy_fork (EV_A);
3051#endif
3052
3053#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
3054  if (ev_is_active (&pipe_w) && postfork != 2)
3055    {
3056      /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
3057
3058      ev_ref (EV_A);
3059      ev_io_stop (EV_A_ &pipe_w);
3060
3061      if (evpipe [0] >= 0)
3062        EV_WIN32_CLOSE_FD (evpipe [0]);
3063
3064      evpipe_init (EV_A);
3065      /* iterate over everything, in case we missed something before */
3066      ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3067    }
3068#endif
3069
3070  postfork = 0;
3071}
3072
3073#if EV_MULTIPLICITY
3074
3075struct ev_loop * ecb_cold
3076ev_loop_new (unsigned int flags) EV_THROW
3077{
3078  EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
3079
3080  memset (EV_A, 0, sizeof (struct ev_loop));
3081  loop_init (EV_A_ flags);
3082
3083  if (ev_backend (EV_A))
3084    return EV_A;
3085
3086  ev_free (EV_A);
3087  return 0;
3088}
3089
3090#endif /* multiplicity */
3091
3092#if EV_VERIFY
3093static void noinline ecb_cold
3094verify_watcher (EV_P_ W w)
3095{
3096  assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
3097
3098  if (w->pending)
3099    assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
3100}
3101
3102static void noinline ecb_cold
3103verify_heap (EV_P_ ANHE *heap, int N)
3104{
3105  int i;
3106
3107  for (i = HEAP0; i < N + HEAP0; ++i)
3108    {
3109      assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
3110      assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
3111      assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
3112
3113      verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
3114    }
3115}
3116
3117static void noinline ecb_cold
3118array_verify (EV_P_ W *ws, int cnt)
3119{
3120  while (cnt--)
3121    {
3122      assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
3123      verify_watcher (EV_A_ ws [cnt]);
3124    }
3125}
3126#endif
3127
3128#if EV_FEATURE_API
3129void ecb_cold
3130ev_verify (EV_P) EV_THROW
3131{
3132#if EV_VERIFY
3133  int i;
3134  WL w, w2;
3135
3136  assert (activecnt >= -1);
3137
3138  assert (fdchangemax >= fdchangecnt);
3139  for (i = 0; i < fdchangecnt; ++i)
3140    assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
3141
3142  assert (anfdmax >= 0);
3143  for (i = 0; i < anfdmax; ++i)
3144    {
3145      int j = 0;
3146
3147      for (w = w2 = anfds [i].head; w; w = w->next)
3148        {
3149          verify_watcher (EV_A_ (W)w);
3150
3151          if (j++ & 1)
3152            {
3153              assert (("libev: io watcher list contains a loop", w != w2));
3154              w2 = w2->next;
3155            }
3156
3157          assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
3158          assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
3159        }
3160    }
3161
3162  assert (timermax >= timercnt);
3163  verify_heap (EV_A_ timers, timercnt);
3164
3165#if EV_PERIODIC_ENABLE
3166  assert (periodicmax >= periodiccnt);
3167  verify_heap (EV_A_ periodics, periodiccnt);
3168#endif
3169
3170  for (i = NUMPRI; i--; )
3171    {
3172      assert (pendingmax [i] >= pendingcnt [i]);
3173#if EV_IDLE_ENABLE
3174      assert (idleall >= 0);
3175      assert (idlemax [i] >= idlecnt [i]);
3176      array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
3177#endif
3178    }
3179
3180#if EV_FORK_ENABLE
3181  assert (forkmax >= forkcnt);
3182  array_verify (EV_A_ (W *)forks, forkcnt);
3183#endif
3184
3185#if EV_CLEANUP_ENABLE
3186  assert (cleanupmax >= cleanupcnt);
3187  array_verify (EV_A_ (W *)cleanups, cleanupcnt);
3188#endif
3189
3190#if EV_ASYNC_ENABLE
3191  assert (asyncmax >= asynccnt);
3192  array_verify (EV_A_ (W *)asyncs, asynccnt);
3193#endif
3194
3195#if EV_PREPARE_ENABLE
3196  assert (preparemax >= preparecnt);
3197  array_verify (EV_A_ (W *)prepares, preparecnt);
3198#endif
3199
3200#if EV_CHECK_ENABLE
3201  assert (checkmax >= checkcnt);
3202  array_verify (EV_A_ (W *)checks, checkcnt);
3203#endif
3204
3205# if 0
3206#if EV_CHILD_ENABLE
3207  for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
3208  for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
3209#endif
3210# endif
3211#endif
3212}
3213#endif
3214
3215#if EV_MULTIPLICITY
3216struct ev_loop * ecb_cold
3217#else
3218int
3219#endif
3220ev_default_loop (unsigned int flags) EV_THROW
3221{
3222  if (!ev_default_loop_ptr)
3223    {
3224#if EV_MULTIPLICITY
3225      EV_P = ev_default_loop_ptr = &default_loop_struct;
3226#else
3227      ev_default_loop_ptr = 1;
3228#endif
3229
3230      loop_init (EV_A_ flags);
3231
3232      if (ev_backend (EV_A))
3233        {
3234#if EV_CHILD_ENABLE
3235          ev_signal_init (&childev, childcb, SIGCHLD);
3236          ev_set_priority (&childev, EV_MAXPRI);
3237          ev_signal_start (EV_A_ &childev);
3238          ev_unref (EV_A); /* child watcher should not keep loop alive */
3239#endif
3240        }
3241      else
3242        ev_default_loop_ptr = 0;
3243    }
3244
3245  return ev_default_loop_ptr;
3246}
3247
3248void
3249ev_loop_fork (EV_P) EV_THROW
3250{
3251  postfork = 1;
3252}
3253
3254/*****************************************************************************/
3255
3256void
3257ev_invoke (EV_P_ void *w, int revents)
3258{
3259  EV_CB_INVOKE ((W)w, revents);
3260}
3261
3262unsigned int
3263ev_pending_count (EV_P) EV_THROW
3264{
3265  int pri;
3266  unsigned int count = 0;
3267
3268  for (pri = NUMPRI; pri--; )
3269    count += pendingcnt [pri];
3270
3271  return count;
3272}
3273
3274void noinline
3275ev_invoke_pending (EV_P)
3276{
3277  pendingpri = NUMPRI;
3278
3279  while (pendingpri) /* pendingpri possibly gets modified in the inner loop */
3280    {
3281      --pendingpri;
3282
3283      while (pendingcnt [pendingpri])
3284        {
3285          ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
3286
3287          p->w->pending = 0;
3288          EV_CB_INVOKE (p->w, p->events);
3289          EV_FREQUENT_CHECK;
3290        }
3291    }
3292}
3293
3294#if EV_IDLE_ENABLE
3295/* make idle watchers pending. this handles the "call-idle */
3296/* only when higher priorities are idle" logic */
3297inline_size void
3298idle_reify (EV_P)
3299{
3300  if (expect_false (idleall))
3301    {
3302      int pri;
3303
3304      for (pri = NUMPRI; pri--; )
3305        {
3306          if (pendingcnt [pri])
3307            break;
3308
3309          if (idlecnt [pri])
3310            {
3311              queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
3312              break;
3313            }
3314        }
3315    }
3316}
3317#endif
3318
3319/* make timers pending */
3320inline_size void
3321timers_reify (EV_P)
3322{
3323  EV_FREQUENT_CHECK;
3324
3325  if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
3326    {
3327      do
3328        {
3329          ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
3330
3331          /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
3332
3333          /* first reschedule or stop timer */
3334          if (w->repeat)
3335            {
3336              ev_at (w) += w->repeat;
3337              if (ev_at (w) < mn_now)
3338                ev_at (w) = mn_now;
3339
3340              assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
3341
3342              ANHE_at_cache (timers [HEAP0]);
3343              downheap (timers, timercnt, HEAP0);
3344            }
3345          else
3346            ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
3347
3348          EV_FREQUENT_CHECK;
3349          feed_reverse (EV_A_ (W)w);
3350        }
3351      while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
3352
3353      feed_reverse_done (EV_A_ EV_TIMER);
3354    }
3355}
3356
3357#if EV_PERIODIC_ENABLE
3358
3359static void noinline
3360periodic_recalc (EV_P_ ev_periodic *w)
3361{
3362  ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
3363  ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
3364
3365  /* the above almost always errs on the low side */
3366  while (at <= ev_rt_now)
3367    {
3368      ev_tstamp nat = at + w->interval;
3369
3370      /* when resolution fails us, we use ev_rt_now */
3371      if (expect_false (nat == at))
3372        {
3373          at = ev_rt_now;
3374          break;
3375        }
3376
3377      at = nat;
3378    }
3379
3380  ev_at (w) = at;
3381}
3382
3383/* make periodics pending */
3384inline_size void
3385periodics_reify (EV_P)
3386{
3387  EV_FREQUENT_CHECK;
3388
3389  while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
3390    {
3391      do
3392        {
3393          ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
3394
3395          /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
3396
3397          /* first reschedule or stop timer */
3398          if (w->reschedule_cb)
3399            {
3400              ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3401
3402              assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
3403
3404              ANHE_at_cache (periodics [HEAP0]);
3405              downheap (periodics, periodiccnt, HEAP0);
3406            }
3407          else if (w->interval)
3408            {
3409              periodic_recalc (EV_A_ w);
3410              ANHE_at_cache (periodics [HEAP0]);
3411              downheap (periodics, periodiccnt, HEAP0);
3412            }
3413          else
3414            ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
3415
3416          EV_FREQUENT_CHECK;
3417          feed_reverse (EV_A_ (W)w);
3418        }
3419      while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
3420
3421      feed_reverse_done (EV_A_ EV_PERIODIC);
3422    }
3423}
3424
3425/* simply recalculate all periodics */
3426/* TODO: maybe ensure that at least one event happens when jumping forward? */
3427static void noinline ecb_cold
3428periodics_reschedule (EV_P)
3429{
3430  int i;
3431
3432  /* adjust periodics after time jump */
3433  for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
3434    {
3435      ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
3436
3437      if (w->reschedule_cb)
3438        ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3439      else if (w->interval)
3440        periodic_recalc (EV_A_ w);
3441
3442      ANHE_at_cache (periodics [i]);
3443    }
3444
3445  reheap (periodics, periodiccnt);
3446}
3447#endif
3448
3449/* adjust all timers by a given offset */
3450static void noinline ecb_cold
3451timers_reschedule (EV_P_ ev_tstamp adjust)
3452{
3453  int i;
3454
3455  for (i = 0; i < timercnt; ++i)
3456    {
3457      ANHE *he = timers + i + HEAP0;
3458      ANHE_w (*he)->at += adjust;
3459      ANHE_at_cache (*he);
3460    }
3461}
3462
3463/* fetch new monotonic and realtime times from the kernel */
3464/* also detect if there was a timejump, and act accordingly */
3465inline_speed void
3466time_update (EV_P_ ev_tstamp max_block)
3467{
3468#if EV_USE_MONOTONIC
3469  if (expect_true (have_monotonic))
3470    {
3471      int i;
3472      ev_tstamp odiff = rtmn_diff;
3473
3474      mn_now = get_clock ();
3475
3476      /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
3477      /* interpolate in the meantime */
3478      if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
3479        {
3480          ev_rt_now = rtmn_diff + mn_now;
3481          return;
3482        }
3483
3484      now_floor = mn_now;
3485      ev_rt_now = ev_time ();
3486
3487      /* loop a few times, before making important decisions.
3488       * on the choice of "4": one iteration isn't enough,
3489       * in case we get preempted during the calls to
3490       * ev_time and get_clock. a second call is almost guaranteed
3491       * to succeed in that case, though. and looping a few more times
3492       * doesn't hurt either as we only do this on time-jumps or
3493       * in the unlikely event of having been preempted here.
3494       */
3495      for (i = 4; --i; )
3496        {
3497          ev_tstamp diff;
3498          rtmn_diff = ev_rt_now - mn_now;
3499
3500          diff = odiff - rtmn_diff;
3501
3502          if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
3503            return; /* all is well */
3504
3505          ev_rt_now = ev_time ();
3506          mn_now    = get_clock ();
3507          now_floor = mn_now;
3508        }
3509
3510      /* no timer adjustment, as the monotonic clock doesn't jump */
3511      /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
3512# if EV_PERIODIC_ENABLE
3513      periodics_reschedule (EV_A);
3514# endif
3515    }
3516  else
3517#endif
3518    {
3519      ev_rt_now = ev_time ();
3520
3521      if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
3522        {
3523          /* adjust timers. this is easy, as the offset is the same for all of them */
3524          timers_reschedule (EV_A_ ev_rt_now - mn_now);
3525#if EV_PERIODIC_ENABLE
3526          periodics_reschedule (EV_A);
3527#endif
3528        }
3529
3530      mn_now = ev_rt_now;
3531    }
3532}
3533
3534int
3535ev_run (EV_P_ int flags)
3536{
3537#if EV_FEATURE_API
3538  ++loop_depth;
3539#endif
3540
3541  assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
3542
3543  loop_done = EVBREAK_CANCEL;
3544
3545  EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
3546
3547  do
3548    {
3549#if EV_VERIFY >= 2
3550      ev_verify (EV_A);
3551#endif
3552
3553#ifndef _WIN32
3554      if (expect_false (curpid)) /* penalise the forking check even more */
3555        if (expect_false (getpid () != curpid))
3556          {
3557            curpid = getpid ();
3558            postfork = 1;
3559          }
3560#endif
3561
3562#if EV_FORK_ENABLE
3563      /* we might have forked, so queue fork handlers */
3564      if (expect_false (postfork))
3565        if (forkcnt)
3566          {
3567            queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
3568            EV_INVOKE_PENDING;
3569          }
3570#endif
3571
3572#if EV_PREPARE_ENABLE
3573      /* queue prepare watchers (and execute them) */
3574      if (expect_false (preparecnt))
3575        {
3576          queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
3577          EV_INVOKE_PENDING;
3578        }
3579#endif
3580
3581      if (expect_false (loop_done))
3582        break;
3583
3584      /* we might have forked, so reify kernel state if necessary */
3585      if (expect_false (postfork))
3586        loop_fork (EV_A);
3587
3588      /* update fd-related kernel structures */
3589      fd_reify (EV_A);
3590
3591      /* calculate blocking time */
3592      {
3593        ev_tstamp waittime  = 0.;
3594        ev_tstamp sleeptime = 0.;
3595
3596        /* remember old timestamp for io_blocktime calculation */
3597        ev_tstamp prev_mn_now = mn_now;
3598
3599        /* update time to cancel out callback processing overhead */
3600        time_update (EV_A_ 1e100);
3601
3602        /* from now on, we want a pipe-wake-up */
3603        pipe_write_wanted = 1;
3604
3605        ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
3606
3607        if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
3608          {
3609            waittime = MAX_BLOCKTIME;
3610
3611            if (timercnt)
3612              {
3613                ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
3614                if (waittime > to) waittime = to;
3615              }
3616
3617#if EV_PERIODIC_ENABLE
3618            if (periodiccnt)
3619              {
3620                ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
3621                if (waittime > to) waittime = to;
3622              }
3623#endif
3624
3625            /* don't let timeouts decrease the waittime below timeout_blocktime */
3626            if (expect_false (waittime < timeout_blocktime))
3627              waittime = timeout_blocktime;
3628
3629            /* at this point, we NEED to wait, so we have to ensure */
3630            /* to pass a minimum nonzero value to the backend */
3631            if (expect_false (waittime < backend_mintime))
3632              waittime = backend_mintime;
3633
3634            /* extra check because io_blocktime is commonly 0 */
3635            if (expect_false (io_blocktime))
3636              {
3637                sleeptime = io_blocktime - (mn_now - prev_mn_now);
3638
3639                if (sleeptime > waittime - backend_mintime)
3640                  sleeptime = waittime - backend_mintime;
3641
3642                if (expect_true (sleeptime > 0.))
3643                  {
3644                    ev_sleep (sleeptime);
3645                    waittime -= sleeptime;
3646                  }
3647              }
3648          }
3649
3650#if EV_FEATURE_API
3651        ++loop_count;
3652#endif
3653        assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3654        backend_poll (EV_A_ waittime);
3655        assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3656
3657        pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3658
3659        ECB_MEMORY_FENCE_ACQUIRE;
3660        if (pipe_write_skipped)
3661          {
3662            assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3663            ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3664          }
3665
3666
3667        /* update ev_rt_now, do magic */
3668        time_update (EV_A_ waittime + sleeptime);
3669      }
3670
3671      /* queue pending timers and reschedule them */
3672      timers_reify (EV_A); /* relative timers called last */
3673#if EV_PERIODIC_ENABLE
3674      periodics_reify (EV_A); /* absolute timers called first */
3675#endif
3676
3677#if EV_IDLE_ENABLE
3678      /* queue idle watchers unless other events are pending */
3679      idle_reify (EV_A);
3680#endif
3681
3682#if EV_CHECK_ENABLE
3683      /* queue check watchers, to be executed first */
3684      if (expect_false (checkcnt))
3685        queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3686#endif
3687
3688      EV_INVOKE_PENDING;
3689    }
3690  while (expect_true (
3691    activecnt
3692    && !loop_done
3693    && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3694  ));
3695
3696  if (loop_done == EVBREAK_ONE)
3697    loop_done = EVBREAK_CANCEL;
3698
3699#if EV_FEATURE_API
3700  --loop_depth;
3701#endif
3702
3703  return activecnt;
3704}
3705
3706void
3707ev_break (EV_P_ int how) EV_THROW
3708{
3709  loop_done = how;
3710}
3711
3712void
3713ev_ref (EV_P) EV_THROW
3714{
3715  ++activecnt;
3716}
3717
3718void
3719ev_unref (EV_P) EV_THROW
3720{
3721  --activecnt;
3722}
3723
3724void
3725ev_now_update (EV_P) EV_THROW
3726{
3727  time_update (EV_A_ 1e100);
3728}
3729
3730void
3731ev_suspend (EV_P) EV_THROW
3732{
3733  ev_now_update (EV_A);
3734}
3735
3736void
3737ev_resume (EV_P) EV_THROW
3738{
3739  ev_tstamp mn_prev = mn_now;
3740
3741  ev_now_update (EV_A);
3742  timers_reschedule (EV_A_ mn_now - mn_prev);
3743#if EV_PERIODIC_ENABLE
3744  /* TODO: really do this? */
3745  periodics_reschedule (EV_A);
3746#endif
3747}
3748
3749/*****************************************************************************/
3750/* singly-linked list management, used when the expected list length is short */
3751
3752inline_size void
3753wlist_add (WL *head, WL elem)
3754{
3755  elem->next = *head;
3756  *head = elem;
3757}
3758
3759inline_size void
3760wlist_del (WL *head, WL elem)
3761{
3762  while (*head)
3763    {
3764      if (expect_true (*head == elem))
3765        {
3766          *head = elem->next;
3767          break;
3768        }
3769
3770      head = &(*head)->next;
3771    }
3772}
3773
3774/* internal, faster, version of ev_clear_pending */
3775inline_speed void
3776clear_pending (EV_P_ W w)
3777{
3778  if (w->pending)
3779    {
3780      pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3781      w->pending = 0;
3782    }
3783}
3784
3785int
3786ev_clear_pending (EV_P_ void *w) EV_THROW
3787{
3788  W w_ = (W)w;
3789  int pending = w_->pending;
3790
3791  if (expect_true (pending))
3792    {
3793      ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3794      p->w = (W)&pending_w;
3795      w_->pending = 0;
3796      return p->events;
3797    }
3798  else
3799    return 0;
3800}
3801
3802inline_size void
3803pri_adjust (EV_P_ W w)
3804{
3805  int pri = ev_priority (w);
3806  pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3807  pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3808  ev_set_priority (w, pri);
3809}
3810
3811inline_speed void
3812ev_start (EV_P_ W w, int active)
3813{
3814  pri_adjust (EV_A_ w);
3815  w->active = active;
3816  ev_ref (EV_A);
3817}
3818
3819inline_size void
3820ev_stop (EV_P_ W w)
3821{
3822  ev_unref (EV_A);
3823  w->active = 0;
3824}
3825
3826/*****************************************************************************/
3827
3828void noinline
3829ev_io_start (EV_P_ ev_io *w) EV_THROW
3830{
3831  int fd = w->fd;
3832
3833  if (expect_false (ev_is_active (w)))
3834    return;
3835
3836  assert (("libev: ev_io_start called with negative fd", fd >= 0));
3837  assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3838
3839  EV_FREQUENT_CHECK;
3840
3841  ev_start (EV_A_ (W)w, 1);
3842  array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3843  wlist_add (&anfds[fd].head, (WL)w);
3844
3845  /* common bug, apparently */
3846  assert (("libev: ev_io_start called with corrupted watcher", ((WL)w)->next != (WL)w));
3847
3848  fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3849  w->events &= ~EV__IOFDSET;
3850
3851  EV_FREQUENT_CHECK;
3852}
3853
3854void noinline
3855ev_io_stop (EV_P_ ev_io *w) EV_THROW
3856{
3857  clear_pending (EV_A_ (W)w);
3858  if (expect_false (!ev_is_active (w)))
3859    return;
3860
3861  assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3862
3863  EV_FREQUENT_CHECK;
3864
3865  wlist_del (&anfds[w->fd].head, (WL)w);
3866  ev_stop (EV_A_ (W)w);
3867
3868  fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3869
3870  EV_FREQUENT_CHECK;
3871}
3872
3873void noinline
3874ev_timer_start (EV_P_ ev_timer *w) EV_THROW
3875{
3876  if (expect_false (ev_is_active (w)))
3877    return;
3878
3879  ev_at (w) += mn_now;
3880
3881  assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3882
3883  EV_FREQUENT_CHECK;
3884
3885  ++timercnt;
3886  ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3887  array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3888  ANHE_w (timers [ev_active (w)]) = (WT)w;
3889  ANHE_at_cache (timers [ev_active (w)]);
3890  upheap (timers, ev_active (w));
3891
3892  EV_FREQUENT_CHECK;
3893
3894  /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3895}
3896
3897void noinline
3898ev_timer_stop (EV_P_ ev_timer *w) EV_THROW
3899{
3900  clear_pending (EV_A_ (W)w);
3901  if (expect_false (!ev_is_active (w)))
3902    return;
3903
3904  EV_FREQUENT_CHECK;
3905
3906  {
3907    int active = ev_active (w);
3908
3909    assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3910
3911    --timercnt;
3912
3913    if (expect_true (active < timercnt + HEAP0))
3914      {
3915        timers [active] = timers [timercnt + HEAP0];
3916        adjustheap (timers, timercnt, active);
3917      }
3918  }
3919
3920  ev_at (w) -= mn_now;
3921
3922  ev_stop (EV_A_ (W)w);
3923
3924  EV_FREQUENT_CHECK;
3925}
3926
3927void noinline
3928ev_timer_again (EV_P_ ev_timer *w) EV_THROW
3929{
3930  EV_FREQUENT_CHECK;
3931
3932  clear_pending (EV_A_ (W)w);
3933
3934  if (ev_is_active (w))
3935    {
3936      if (w->repeat)
3937        {
3938          ev_at (w) = mn_now + w->repeat;
3939          ANHE_at_cache (timers [ev_active (w)]);
3940          adjustheap (timers, timercnt, ev_active (w));
3941        }
3942      else
3943        ev_timer_stop (EV_A_ w);
3944    }
3945  else if (w->repeat)
3946    {
3947      ev_at (w) = w->repeat;
3948      ev_timer_start (EV_A_ w);
3949    }
3950
3951  EV_FREQUENT_CHECK;
3952}
3953
3954ev_tstamp
3955ev_timer_remaining (EV_P_ ev_timer *w) EV_THROW
3956{
3957  return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3958}
3959
3960#if EV_PERIODIC_ENABLE
3961void noinline
3962ev_periodic_start (EV_P_ ev_periodic *w) EV_THROW
3963{
3964  if (expect_false (ev_is_active (w)))
3965    return;
3966
3967  if (w->reschedule_cb)
3968    ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3969  else if (w->interval)
3970    {
3971      assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3972      periodic_recalc (EV_A_ w);
3973    }
3974  else
3975    ev_at (w) = w->offset;
3976
3977  EV_FREQUENT_CHECK;
3978
3979  ++periodiccnt;
3980  ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3981  array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3982  ANHE_w (periodics [ev_active (w)]) = (WT)w;
3983  ANHE_at_cache (periodics [ev_active (w)]);
3984  upheap (periodics, ev_active (w));
3985
3986  EV_FREQUENT_CHECK;
3987
3988  /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3989}
3990
3991void noinline
3992ev_periodic_stop (EV_P_ ev_periodic *w) EV_THROW
3993{
3994  clear_pending (EV_A_ (W)w);
3995  if (expect_false (!ev_is_active (w)))
3996    return;
3997
3998  EV_FREQUENT_CHECK;
3999
4000  {
4001    int active = ev_active (w);
4002
4003    assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
4004
4005    --periodiccnt;
4006
4007    if (expect_true (active < periodiccnt + HEAP0))
4008      {
4009        periodics [active] = periodics [periodiccnt + HEAP0];
4010        adjustheap (periodics, periodiccnt, active);
4011      }
4012  }
4013
4014  ev_stop (EV_A_ (W)w);
4015
4016  EV_FREQUENT_CHECK;
4017}
4018
4019void noinline
4020ev_periodic_again (EV_P_ ev_periodic *w) EV_THROW
4021{
4022  /* TODO: use adjustheap and recalculation */
4023  ev_periodic_stop (EV_A_ w);
4024  ev_periodic_start (EV_A_ w);
4025}
4026#endif
4027
4028#ifndef SA_RESTART
4029# define SA_RESTART 0
4030#endif
4031
4032#if EV_SIGNAL_ENABLE
4033
4034void noinline
4035ev_signal_start (EV_P_ ev_signal *w) EV_THROW
4036{
4037  if (expect_false (ev_is_active (w)))
4038    return;
4039
4040  assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
4041
4042#if EV_MULTIPLICITY
4043  assert (("libev: a signal must not be attached to two different loops",
4044           !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
4045
4046  signals [w->signum - 1].loop = EV_A;
4047  ECB_MEMORY_FENCE_RELEASE;
4048#endif
4049
4050  EV_FREQUENT_CHECK;
4051
4052#if EV_USE_SIGNALFD
4053  if (sigfd == -2)
4054    {
4055      sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
4056      if (sigfd < 0 && errno == EINVAL)
4057        sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
4058
4059      if (sigfd >= 0)
4060        {
4061          fd_intern (sigfd); /* doing it twice will not hurt */
4062
4063          sigemptyset (&sigfd_set);
4064
4065          ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
4066          ev_set_priority (&sigfd_w, EV_MAXPRI);
4067          ev_io_start (EV_A_ &sigfd_w);
4068          ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
4069        }
4070    }
4071
4072  if (sigfd >= 0)
4073    {
4074      /* TODO: check .head */
4075      sigaddset (&sigfd_set, w->signum);
4076      sigprocmask (SIG_BLOCK, &sigfd_set, 0);
4077
4078      signalfd (sigfd, &sigfd_set, 0);
4079    }
4080#endif
4081
4082  ev_start (EV_A_ (W)w, 1);
4083  wlist_add (&signals [w->signum - 1].head, (WL)w);
4084
4085  if (!((WL)w)->next)
4086# if EV_USE_SIGNALFD
4087    if (sigfd < 0) /*TODO*/
4088# endif
4089      {
4090# ifdef _WIN32
4091        evpipe_init (EV_A);
4092
4093        signal (w->signum, ev_sighandler);
4094# else
4095        struct sigaction sa;
4096
4097        evpipe_init (EV_A);
4098
4099        sa.sa_handler = ev_sighandler;
4100        sigfillset (&sa.sa_mask);
4101        sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
4102        sigaction (w->signum, &sa, 0);
4103
4104        if (origflags & EVFLAG_NOSIGMASK)
4105          {
4106            sigemptyset (&sa.sa_mask);
4107            sigaddset (&sa.sa_mask, w->signum);
4108            sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
4109          }
4110#endif
4111      }
4112
4113  EV_FREQUENT_CHECK;
4114}
4115
4116void noinline
4117ev_signal_stop (EV_P_ ev_signal *w) EV_THROW
4118{
4119  clear_pending (EV_A_ (W)w);
4120  if (expect_false (!ev_is_active (w)))
4121    return;
4122
4123  EV_FREQUENT_CHECK;
4124
4125  wlist_del (&signals [w->signum - 1].head, (WL)w);
4126  ev_stop (EV_A_ (W)w);
4127
4128  if (!signals [w->signum - 1].head)
4129    {
4130#if EV_MULTIPLICITY
4131      signals [w->signum - 1].loop = 0; /* unattach from signal */
4132#endif
4133#if EV_USE_SIGNALFD
4134      if (sigfd >= 0)
4135        {
4136          sigset_t ss;
4137
4138          sigemptyset (&ss);
4139          sigaddset (&ss, w->signum);
4140          sigdelset (&sigfd_set, w->signum);
4141
4142          signalfd (sigfd, &sigfd_set, 0);
4143          sigprocmask (SIG_UNBLOCK, &ss, 0);
4144        }
4145      else
4146#endif
4147        signal (w->signum, SIG_DFL);
4148    }
4149
4150  EV_FREQUENT_CHECK;
4151}
4152
4153#endif
4154
4155#if EV_CHILD_ENABLE
4156
4157void
4158ev_child_start (EV_P_ ev_child *w) EV_THROW
4159{
4160#if EV_MULTIPLICITY
4161  assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
4162#endif
4163  if (expect_false (ev_is_active (w)))
4164    return;
4165
4166  EV_FREQUENT_CHECK;
4167
4168  ev_start (EV_A_ (W)w, 1);
4169  wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
4170
4171  EV_FREQUENT_CHECK;
4172}
4173
4174void
4175ev_child_stop (EV_P_ ev_child *w) EV_THROW
4176{
4177  clear_pending (EV_A_ (W)w);
4178  if (expect_false (!ev_is_active (w)))
4179    return;
4180
4181  EV_FREQUENT_CHECK;
4182
4183  wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
4184  ev_stop (EV_A_ (W)w);
4185
4186  EV_FREQUENT_CHECK;
4187}
4188
4189#endif
4190
4191#if EV_STAT_ENABLE
4192
4193# ifdef _WIN32
4194#  undef lstat
4195#  define lstat(a,b) _stati64 (a,b)
4196# endif
4197
4198#define DEF_STAT_INTERVAL  5.0074891
4199#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
4200#define MIN_STAT_INTERVAL  0.1074891
4201
4202static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
4203
4204#if EV_USE_INOTIFY
4205
4206/* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
4207# define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
4208
4209static void noinline
4210infy_add (EV_P_ ev_stat *w)
4211{
4212  w->wd = inotify_add_watch (fs_fd, w->path,
4213                             IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY
4214                             | IN_CREATE | IN_DELETE | IN_MOVED_FROM | IN_MOVED_TO
4215                             | IN_DONT_FOLLOW | IN_MASK_ADD);
4216
4217  if (w->wd >= 0)
4218    {
4219      struct statfs sfs;
4220
4221      /* now local changes will be tracked by inotify, but remote changes won't */
4222      /* unless the filesystem is known to be local, we therefore still poll */
4223      /* also do poll on <2.6.25, but with normal frequency */
4224
4225      if (!fs_2625)
4226        w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
4227      else if (!statfs (w->path, &sfs)
4228               && (sfs.f_type == 0x1373 /* devfs */
4229                   || sfs.f_type == 0x4006 /* fat */
4230                   || sfs.f_type == 0x4d44 /* msdos */
4231                   || sfs.f_type == 0xEF53 /* ext2/3 */
4232                   || sfs.f_type == 0x72b6 /* jffs2 */
4233                   || sfs.f_type == 0x858458f6 /* ramfs */
4234                   || sfs.f_type == 0x5346544e /* ntfs */
4235                   || sfs.f_type == 0x3153464a /* jfs */
4236                   || sfs.f_type == 0x9123683e /* btrfs */
4237                   || sfs.f_type == 0x52654973 /* reiser3 */
4238                   || sfs.f_type == 0x01021994 /* tmpfs */
4239                   || sfs.f_type == 0x58465342 /* xfs */))
4240        w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
4241      else
4242        w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
4243    }
4244  else
4245    {
4246      /* can't use inotify, continue to stat */
4247      w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
4248
4249      /* if path is not there, monitor some parent directory for speedup hints */
4250      /* note that exceeding the hardcoded path limit is not a correctness issue, */
4251      /* but an efficiency issue only */
4252      if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
4253        {
4254          char path [4096];
4255          strcpy (path, w->path);
4256
4257          do
4258            {
4259              int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
4260                       | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
4261
4262              char *pend = strrchr (path, '/');
4263
4264              if (!pend || pend == path)
4265                break;
4266
4267              *pend = 0;
4268              w->wd = inotify_add_watch (fs_fd, path, mask);
4269            }
4270          while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
4271        }
4272    }
4273
4274  if (w->wd >= 0)
4275    wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
4276
4277  /* now re-arm timer, if required */
4278  if (ev_is_active (&w->timer)) ev_ref (EV_A);
4279  ev_timer_again (EV_A_ &w->timer);
4280  if (ev_is_active (&w->timer)) ev_unref (EV_A);
4281}
4282
4283static void noinline
4284infy_del (EV_P_ ev_stat *w)
4285{
4286  int slot;
4287  int wd = w->wd;
4288
4289  if (wd < 0)
4290    return;
4291
4292  w->wd = -2;
4293  slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
4294  wlist_del (&fs_hash [slot].head, (WL)w);
4295
4296  /* remove this watcher, if others are watching it, they will rearm */
4297  inotify_rm_watch (fs_fd, wd);
4298}
4299
4300static void noinline
4301infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
4302{
4303  if (slot < 0)
4304    /* overflow, need to check for all hash slots */
4305    for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
4306      infy_wd (EV_A_ slot, wd, ev);
4307  else
4308    {
4309      WL w_;
4310
4311      for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
4312        {
4313          ev_stat *w = (ev_stat *)w_;
4314          w_ = w_->next; /* lets us remove this watcher and all before it */
4315
4316          if (w->wd == wd || wd == -1)
4317            {
4318              if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
4319                {
4320                  wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
4321                  w->wd = -1;
4322                  infy_add (EV_A_ w); /* re-add, no matter what */
4323                }
4324
4325              stat_timer_cb (EV_A_ &w->timer, 0);
4326            }
4327        }
4328    }
4329}
4330
4331static void
4332infy_cb (EV_P_ ev_io *w, int revents)
4333{
4334  char buf [EV_INOTIFY_BUFSIZE];
4335  int ofs;
4336  int len = read (fs_fd, buf, sizeof (buf));
4337
4338  for (ofs = 0; ofs < len; )
4339    {
4340      struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
4341      infy_wd (EV_A_ ev->wd, ev->wd, ev);
4342      ofs += sizeof (struct inotify_event) + ev->len;
4343    }
4344}
4345
4346inline_size void ecb_cold
4347ev_check_2625 (EV_P)
4348{
4349  /* kernels < 2.6.25 are borked
4350   * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
4351   */
4352  if (ev_linux_version () < 0x020619)
4353    return;
4354
4355  fs_2625 = 1;
4356}
4357
4358inline_size int
4359infy_newfd (void)
4360{
4361#if defined IN_CLOEXEC && defined IN_NONBLOCK
4362  int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
4363  if (fd >= 0)
4364    return fd;
4365#endif
4366  return inotify_init ();
4367}
4368
4369inline_size void
4370infy_init (EV_P)
4371{
4372  if (fs_fd != -2)
4373    return;
4374
4375  fs_fd = -1;
4376
4377  ev_check_2625 (EV_A);
4378
4379  fs_fd = infy_newfd ();
4380
4381  if (fs_fd >= 0)
4382    {
4383      fd_intern (fs_fd);
4384      ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
4385      ev_set_priority (&fs_w, EV_MAXPRI);
4386      ev_io_start (EV_A_ &fs_w);
4387      ev_unref (EV_A);
4388    }
4389}
4390
4391inline_size void
4392infy_fork (EV_P)
4393{
4394  int slot;
4395
4396  if (fs_fd < 0)
4397    return;
4398
4399  ev_ref (EV_A);
4400  ev_io_stop (EV_A_ &fs_w);
4401  close (fs_fd);
4402  fs_fd = infy_newfd ();
4403
4404  if (fs_fd >= 0)
4405    {
4406      fd_intern (fs_fd);
4407      ev_io_set (&fs_w, fs_fd, EV_READ);
4408      ev_io_start (EV_A_ &fs_w);
4409      ev_unref (EV_A);
4410    }
4411
4412  for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
4413    {
4414      WL w_ = fs_hash [slot].head;
4415      fs_hash [slot].head = 0;
4416
4417      while (w_)
4418        {
4419          ev_stat *w = (ev_stat *)w_;
4420          w_ = w_->next; /* lets us add this watcher */
4421
4422          w->wd = -1;
4423
4424          if (fs_fd >= 0)
4425            infy_add (EV_A_ w); /* re-add, no matter what */
4426          else
4427            {
4428              w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
4429              if (ev_is_active (&w->timer)) ev_ref (EV_A);
4430              ev_timer_again (EV_A_ &w->timer);
4431              if (ev_is_active (&w->timer)) ev_unref (EV_A);
4432            }
4433        }
4434    }
4435}
4436
4437#endif
4438
4439#ifdef _WIN32
4440# define EV_LSTAT(p,b) _stati64 (p, b)
4441#else
4442# define EV_LSTAT(p,b) lstat (p, b)
4443#endif
4444
4445void
4446ev_stat_stat (EV_P_ ev_stat *w) EV_THROW
4447{
4448  if (lstat (w->path, &w->attr) < 0)
4449    w->attr.st_nlink = 0;
4450  else if (!w->attr.st_nlink)
4451    w->attr.st_nlink = 1;
4452}
4453
4454static void noinline
4455stat_timer_cb (EV_P_ ev_timer *w_, int revents)
4456{
4457  ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
4458
4459  ev_statdata prev = w->attr;
4460  ev_stat_stat (EV_A_ w);
4461
4462  /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
4463  if (
4464    prev.st_dev      != w->attr.st_dev
4465    || prev.st_ino   != w->attr.st_ino
4466    || prev.st_mode  != w->attr.st_mode
4467    || prev.st_nlink != w->attr.st_nlink
4468    || prev.st_uid   != w->attr.st_uid
4469    || prev.st_gid   != w->attr.st_gid
4470    || prev.st_rdev  != w->attr.st_rdev
4471    || prev.st_size  != w->attr.st_size
4472    || prev.st_atime != w->attr.st_atime
4473    || prev.st_mtime != w->attr.st_mtime
4474    || prev.st_ctime != w->attr.st_ctime
4475  ) {
4476      /* we only update w->prev on actual differences */
4477      /* in case we test more often than invoke the callback, */
4478      /* to ensure that prev is always different to attr */
4479      w->prev = prev;
4480
4481      #if EV_USE_INOTIFY
4482        if (fs_fd >= 0)
4483          {
4484            infy_del (EV_A_ w);
4485            infy_add (EV_A_ w);
4486            ev_stat_stat (EV_A_ w); /* avoid race... */
4487          }
4488      #endif
4489
4490      ev_feed_event (EV_A_ w, EV_STAT);
4491    }
4492}
4493
4494void
4495ev_stat_start (EV_P_ ev_stat *w) EV_THROW
4496{
4497  if (expect_false (ev_is_active (w)))
4498    return;
4499
4500  ev_stat_stat (EV_A_ w);
4501
4502  if (w->interval < MIN_STAT_INTERVAL && w->interval)
4503    w->interval = MIN_STAT_INTERVAL;
4504
4505  ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
4506  ev_set_priority (&w->timer, ev_priority (w));
4507
4508#if EV_USE_INOTIFY
4509  infy_init (EV_A);
4510
4511  if (fs_fd >= 0)
4512    infy_add (EV_A_ w);
4513  else
4514#endif
4515    {
4516      ev_timer_again (EV_A_ &w->timer);
4517      ev_unref (EV_A);
4518    }
4519
4520  ev_start (EV_A_ (W)w, 1);
4521
4522  EV_FREQUENT_CHECK;
4523}
4524
4525void
4526ev_stat_stop (EV_P_ ev_stat *w) EV_THROW
4527{
4528  clear_pending (EV_A_ (W)w);
4529  if (expect_false (!ev_is_active (w)))
4530    return;
4531
4532  EV_FREQUENT_CHECK;
4533
4534#if EV_USE_INOTIFY
4535  infy_del (EV_A_ w);
4536#endif
4537
4538  if (ev_is_active (&w->timer))
4539    {
4540      ev_ref (EV_A);
4541      ev_timer_stop (EV_A_ &w->timer);
4542    }
4543
4544  ev_stop (EV_A_ (W)w);
4545
4546  EV_FREQUENT_CHECK;
4547}
4548#endif
4549
4550#if EV_IDLE_ENABLE
4551void
4552ev_idle_start (EV_P_ ev_idle *w) EV_THROW
4553{
4554  if (expect_false (ev_is_active (w)))
4555    return;
4556
4557  pri_adjust (EV_A_ (W)w);
4558
4559  EV_FREQUENT_CHECK;
4560
4561  {
4562    int active = ++idlecnt [ABSPRI (w)];
4563
4564    ++idleall;
4565    ev_start (EV_A_ (W)w, active);
4566
4567    array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
4568    idles [ABSPRI (w)][active - 1] = w;
4569  }
4570
4571  EV_FREQUENT_CHECK;
4572}
4573
4574void
4575ev_idle_stop (EV_P_ ev_idle *w) EV_THROW
4576{
4577  clear_pending (EV_A_ (W)w);
4578  if (expect_false (!ev_is_active (w)))
4579    return;
4580
4581  EV_FREQUENT_CHECK;
4582
4583  {
4584    int active = ev_active (w);
4585
4586    idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
4587    ev_active (idles [ABSPRI (w)][active - 1]) = active;
4588
4589    ev_stop (EV_A_ (W)w);
4590    --idleall;
4591  }
4592
4593  EV_FREQUENT_CHECK;
4594}
4595#endif
4596
4597#if EV_PREPARE_ENABLE
4598void
4599ev_prepare_start (EV_P_ ev_prepare *w) EV_THROW
4600{
4601  if (expect_false (ev_is_active (w)))
4602    return;
4603
4604  EV_FREQUENT_CHECK;
4605
4606  ev_start (EV_A_ (W)w, ++preparecnt);
4607  array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
4608  prepares [preparecnt - 1] = w;
4609
4610  EV_FREQUENT_CHECK;
4611}
4612
4613void
4614ev_prepare_stop (EV_P_ ev_prepare *w) EV_THROW
4615{
4616  clear_pending (EV_A_ (W)w);
4617  if (expect_false (!ev_is_active (w)))
4618    return;
4619
4620  EV_FREQUENT_CHECK;
4621
4622  {
4623    int active = ev_active (w);
4624
4625    prepares [active - 1] = prepares [--preparecnt];
4626    ev_active (prepares [active - 1]) = active;
4627  }
4628
4629  ev_stop (EV_A_ (W)w);
4630
4631  EV_FREQUENT_CHECK;
4632}
4633#endif
4634
4635#if EV_CHECK_ENABLE
4636void
4637ev_check_start (EV_P_ ev_check *w) EV_THROW
4638{
4639  if (expect_false (ev_is_active (w)))
4640    return;
4641
4642  EV_FREQUENT_CHECK;
4643
4644  ev_start (EV_A_ (W)w, ++checkcnt);
4645  array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
4646  checks [checkcnt - 1] = w;
4647
4648  EV_FREQUENT_CHECK;
4649}
4650
4651void
4652ev_check_stop (EV_P_ ev_check *w) EV_THROW
4653{
4654  clear_pending (EV_A_ (W)w);
4655  if (expect_false (!ev_is_active (w)))
4656    return;
4657
4658  EV_FREQUENT_CHECK;
4659
4660  {
4661    int active = ev_active (w);
4662
4663    checks [active - 1] = checks [--checkcnt];
4664    ev_active (checks [active - 1]) = active;
4665  }
4666
4667  ev_stop (EV_A_ (W)w);
4668
4669  EV_FREQUENT_CHECK;
4670}
4671#endif
4672
4673#if EV_EMBED_ENABLE
4674void noinline
4675ev_embed_sweep (EV_P_ ev_embed *w) EV_THROW
4676{
4677  ev_run (w->other, EVRUN_NOWAIT);
4678}
4679
4680static void
4681embed_io_cb (EV_P_ ev_io *io, int revents)
4682{
4683  ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
4684
4685  if (ev_cb (w))
4686    ev_feed_event (EV_A_ (W)w, EV_EMBED);
4687  else
4688    ev_run (w->other, EVRUN_NOWAIT);
4689}
4690
4691static void
4692embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4693{
4694  ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4695
4696  {
4697    EV_P = w->other;
4698
4699    while (fdchangecnt)
4700      {
4701        fd_reify (EV_A);
4702        ev_run (EV_A_ EVRUN_NOWAIT);
4703      }
4704  }
4705}
4706
4707static void
4708embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4709{
4710  ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4711
4712  ev_embed_stop (EV_A_ w);
4713
4714  {
4715    EV_P = w->other;
4716
4717    ev_loop_fork (EV_A);
4718    ev_run (EV_A_ EVRUN_NOWAIT);
4719  }
4720
4721  ev_embed_start (EV_A_ w);
4722}
4723
4724#if 0
4725static void
4726embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4727{
4728  ev_idle_stop (EV_A_ idle);
4729}
4730#endif
4731
4732void
4733ev_embed_start (EV_P_ ev_embed *w) EV_THROW
4734{
4735  if (expect_false (ev_is_active (w)))
4736    return;
4737
4738  {
4739    EV_P = w->other;
4740    assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4741    ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4742  }
4743
4744  EV_FREQUENT_CHECK;
4745
4746  ev_set_priority (&w->io, ev_priority (w));
4747  ev_io_start (EV_A_ &w->io);
4748
4749  ev_prepare_init (&w->prepare, embed_prepare_cb);
4750  ev_set_priority (&w->prepare, EV_MINPRI);
4751  ev_prepare_start (EV_A_ &w->prepare);
4752
4753  ev_fork_init (&w->fork, embed_fork_cb);
4754  ev_fork_start (EV_A_ &w->fork);
4755
4756  /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4757
4758  ev_start (EV_A_ (W)w, 1);
4759
4760  EV_FREQUENT_CHECK;
4761}
4762
4763void
4764ev_embed_stop (EV_P_ ev_embed *w) EV_THROW
4765{
4766  clear_pending (EV_A_ (W)w);
4767  if (expect_false (!ev_is_active (w)))
4768    return;
4769
4770  EV_FREQUENT_CHECK;
4771
4772  ev_io_stop      (EV_A_ &w->io);
4773  ev_prepare_stop (EV_A_ &w->prepare);
4774  ev_fork_stop    (EV_A_ &w->fork);
4775
4776  ev_stop (EV_A_ (W)w);
4777
4778  EV_FREQUENT_CHECK;
4779}
4780#endif
4781
4782#if EV_FORK_ENABLE
4783void
4784ev_fork_start (EV_P_ ev_fork *w) EV_THROW
4785{
4786  if (expect_false (ev_is_active (w)))
4787    return;
4788
4789  EV_FREQUENT_CHECK;
4790
4791  ev_start (EV_A_ (W)w, ++forkcnt);
4792  array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4793  forks [forkcnt - 1] = w;
4794
4795  EV_FREQUENT_CHECK;
4796}
4797
4798void
4799ev_fork_stop (EV_P_ ev_fork *w) EV_THROW
4800{
4801  clear_pending (EV_A_ (W)w);
4802  if (expect_false (!ev_is_active (w)))
4803    return;
4804
4805  EV_FREQUENT_CHECK;
4806
4807  {
4808    int active = ev_active (w);
4809
4810    forks [active - 1] = forks [--forkcnt];
4811    ev_active (forks [active - 1]) = active;
4812  }
4813
4814  ev_stop (EV_A_ (W)w);
4815
4816  EV_FREQUENT_CHECK;
4817}
4818#endif
4819
4820#if EV_CLEANUP_ENABLE
4821void
4822ev_cleanup_start (EV_P_ ev_cleanup *w) EV_THROW
4823{
4824  if (expect_false (ev_is_active (w)))
4825    return;
4826
4827  EV_FREQUENT_CHECK;
4828
4829  ev_start (EV_A_ (W)w, ++cleanupcnt);
4830  array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4831  cleanups [cleanupcnt - 1] = w;
4832
4833  /* cleanup watchers should never keep a refcount on the loop */
4834  ev_unref (EV_A);
4835  EV_FREQUENT_CHECK;
4836}
4837
4838void
4839ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_THROW
4840{
4841  clear_pending (EV_A_ (W)w);
4842  if (expect_false (!ev_is_active (w)))
4843    return;
4844
4845  EV_FREQUENT_CHECK;
4846  ev_ref (EV_A);
4847
4848  {
4849    int active = ev_active (w);
4850
4851    cleanups [active - 1] = cleanups [--cleanupcnt];
4852    ev_active (cleanups [active - 1]) = active;
4853  }
4854
4855  ev_stop (EV_A_ (W)w);
4856
4857  EV_FREQUENT_CHECK;
4858}
4859#endif
4860
4861#if EV_ASYNC_ENABLE
4862void
4863ev_async_start (EV_P_ ev_async *w) EV_THROW
4864{
4865  if (expect_false (ev_is_active (w)))
4866    return;
4867
4868  w->sent = 0;
4869
4870  evpipe_init (EV_A);
4871
4872  EV_FREQUENT_CHECK;
4873
4874  ev_start (EV_A_ (W)w, ++asynccnt);
4875  array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4876  asyncs [asynccnt - 1] = w;
4877
4878  EV_FREQUENT_CHECK;
4879}
4880
4881void
4882ev_async_stop (EV_P_ ev_async *w) EV_THROW
4883{
4884  clear_pending (EV_A_ (W)w);
4885  if (expect_false (!ev_is_active (w)))
4886    return;
4887
4888  EV_FREQUENT_CHECK;
4889
4890  {
4891    int active = ev_active (w);
4892
4893    asyncs [active - 1] = asyncs [--asynccnt];
4894    ev_active (asyncs [active - 1]) = active;
4895  }
4896
4897  ev_stop (EV_A_ (W)w);
4898
4899  EV_FREQUENT_CHECK;
4900}
4901
4902void
4903ev_async_send (EV_P_ ev_async *w) EV_THROW
4904{
4905  w->sent = 1;
4906  evpipe_write (EV_A_ &async_pending);
4907}
4908#endif
4909
4910/*****************************************************************************/
4911
4912struct ev_once
4913{
4914  ev_io io;
4915  ev_timer to;
4916  void (*cb)(int revents, void *arg);
4917  void *arg;
4918};
4919
4920static void
4921once_cb (EV_P_ struct ev_once *once, int revents)
4922{
4923  void (*cb)(int revents, void *arg) = once->cb;
4924  void *arg = once->arg;
4925
4926  ev_io_stop    (EV_A_ &once->io);
4927  ev_timer_stop (EV_A_ &once->to);
4928  ev_free (once);
4929
4930  cb (revents, arg);
4931}
4932
4933static void
4934once_cb_io (EV_P_ ev_io *w, int revents)
4935{
4936  struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4937
4938  once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
4939}
4940
4941static void
4942once_cb_to (EV_P_ ev_timer *w, int revents)
4943{
4944  struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4945
4946  once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
4947}
4948
4949void
4950ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) EV_THROW
4951{
4952  struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
4953
4954  if (expect_false (!once))
4955    {
4956      cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
4957      return;
4958    }
4959
4960  once->cb  = cb;
4961  once->arg = arg;
4962
4963  ev_init (&once->io, once_cb_io);
4964  if (fd >= 0)
4965    {
4966      ev_io_set (&once->io, fd, events);
4967      ev_io_start (EV_A_ &once->io);
4968    }
4969
4970  ev_init (&once->to, once_cb_to);
4971  if (timeout >= 0.)
4972    {
4973      ev_timer_set (&once->to, timeout, 0.);
4974      ev_timer_start (EV_A_ &once->to);
4975    }
4976}
4977
4978/*****************************************************************************/
4979
4980#if EV_WALK_ENABLE
4981void ecb_cold
4982ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_THROW
4983{
4984  int i, j;
4985  ev_watcher_list *wl, *wn;
4986
4987  if (types & (EV_IO | EV_EMBED))
4988    for (i = 0; i < anfdmax; ++i)
4989      for (wl = anfds [i].head; wl; )
4990        {
4991          wn = wl->next;
4992
4993#if EV_EMBED_ENABLE
4994          if (ev_cb ((ev_io *)wl) == embed_io_cb)
4995            {
4996              if (types & EV_EMBED)
4997                cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4998            }
4999          else
5000#endif
5001#if EV_USE_INOTIFY
5002          if (ev_cb ((ev_io *)wl) == infy_cb)
5003            ;
5004          else
5005#endif
5006          if ((ev_io *)wl != &pipe_w)
5007            if (types & EV_IO)
5008              cb (EV_A_ EV_IO, wl);
5009
5010          wl = wn;
5011        }
5012
5013  if (types & (EV_TIMER | EV_STAT))
5014    for (i = timercnt + HEAP0; i-- > HEAP0; )
5015#if EV_STAT_ENABLE
5016      /*TODO: timer is not always active*/
5017      if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
5018        {
5019          if (types & EV_STAT)
5020            cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
5021        }
5022      else
5023#endif
5024      if (types & EV_TIMER)
5025        cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
5026
5027#if EV_PERIODIC_ENABLE
5028  if (types & EV_PERIODIC)
5029    for (i = periodiccnt + HEAP0; i-- > HEAP0; )
5030      cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
5031#endif
5032
5033#if EV_IDLE_ENABLE
5034  if (types & EV_IDLE)
5035    for (j = NUMPRI; j--; )
5036      for (i = idlecnt [j]; i--; )
5037        cb (EV_A_ EV_IDLE, idles [j][i]);
5038#endif
5039
5040#if EV_FORK_ENABLE
5041  if (types & EV_FORK)
5042    for (i = forkcnt; i--; )
5043      if (ev_cb (forks [i]) != embed_fork_cb)
5044        cb (EV_A_ EV_FORK, forks [i]);
5045#endif
5046
5047#if EV_ASYNC_ENABLE
5048  if (types & EV_ASYNC)
5049    for (i = asynccnt; i--; )
5050      cb (EV_A_ EV_ASYNC, asyncs [i]);
5051#endif
5052
5053#if EV_PREPARE_ENABLE
5054  if (types & EV_PREPARE)
5055    for (i = preparecnt; i--; )
5056# if EV_EMBED_ENABLE
5057      if (ev_cb (prepares [i]) != embed_prepare_cb)
5058# endif
5059        cb (EV_A_ EV_PREPARE, prepares [i]);
5060#endif
5061
5062#if EV_CHECK_ENABLE
5063  if (types & EV_CHECK)
5064    for (i = checkcnt; i--; )
5065      cb (EV_A_ EV_CHECK, checks [i]);
5066#endif
5067
5068#if EV_SIGNAL_ENABLE
5069  if (types & EV_SIGNAL)
5070    for (i = 0; i < EV_NSIG - 1; ++i)
5071      for (wl = signals [i].head; wl; )
5072        {
5073          wn = wl->next;
5074          cb (EV_A_ EV_SIGNAL, wl);
5075          wl = wn;
5076        }
5077#endif
5078
5079#if EV_CHILD_ENABLE
5080  if (types & EV_CHILD)
5081    for (i = (EV_PID_HASHSIZE); i--; )
5082      for (wl = childs [i]; wl; )
5083        {
5084          wn = wl->next;
5085          cb (EV_A_ EV_CHILD, wl);
5086          wl = wn;
5087        }
5088#endif
5089/* EV_STAT     0x00001000 /* stat data changed */
5090/* EV_EMBED    0x00010000 /* embedded event loop needs sweep */
5091}
5092#endif
5093
5094#if EV_MULTIPLICITY
5095  #include "ev_wrap.h"
5096#endif
5097