From 40a899bd6ee536eae093337bf2d0dcc8db4e46f1 Mon Sep 17 00:00:00 2001 From: Mitja Felicijan Date: Mon, 7 Oct 2024 19:30:56 +0200 Subject: Moved example code examples folder --- portmidi/porttime/ptmacosx_mach.c | 204 -------------------------------------- 1 file changed, 204 deletions(-) delete mode 100755 portmidi/porttime/ptmacosx_mach.c (limited to 'portmidi/porttime/ptmacosx_mach.c') diff --git a/portmidi/porttime/ptmacosx_mach.c b/portmidi/porttime/ptmacosx_mach.c deleted file mode 100755 index 1390af8..0000000 --- a/portmidi/porttime/ptmacosx_mach.c +++ /dev/null @@ -1,204 +0,0 @@ -/* ptmacosx.c -- portable timer implementation for mac os x */ - -#include -#include -#include - -#import -#import -#import -#import -#include -#include - -#include "porttime.h" -#include "sys/time.h" -#include "pthread.h" - -#ifndef NSEC_PER_MSEC -#define NSEC_PER_MSEC 1000000 -#endif -#define THREAD_IMPORTANCE 63 - -// QOS headers are available as of macOS 10.10 -#if MAC_OS_X_VERSION_MAX_ALLOWED >= 101000 -#include "sys/qos.h" -#define HAVE_APPLE_QOS 1 -#else -#undef HAVE_APPLE_QOS -#endif - -static int time_started_flag = FALSE; -static UInt64 start_time; -static pthread_t pt_thread_pid; - -/* note that this is static data -- we only need one copy */ -typedef struct { - int id; - int resolution; - PtCallback *callback; - void *userData; -} pt_callback_parameters; - -static int pt_callback_proc_id = 0; - -static void *Pt_CallbackProc(void *p) -{ - pt_callback_parameters *parameters = (pt_callback_parameters *) p; - int mytime = 1; - - kern_return_t error; - thread_extended_policy_data_t extendedPolicy; - thread_precedence_policy_data_t precedencePolicy; - - extendedPolicy.timeshare = 0; - error = thread_policy_set(mach_thread_self(), THREAD_EXTENDED_POLICY, - (thread_policy_t)&extendedPolicy, - THREAD_EXTENDED_POLICY_COUNT); - if (error != KERN_SUCCESS) { - mach_error("Couldn't set thread timeshare policy", error); - } - - precedencePolicy.importance = THREAD_IMPORTANCE; - error = thread_policy_set(mach_thread_self(), THREAD_PRECEDENCE_POLICY, - (thread_policy_t)&precedencePolicy, - THREAD_PRECEDENCE_POLICY_COUNT); - if (error != KERN_SUCCESS) { - mach_error("Couldn't set thread precedence policy", error); - } - - // Most important, set real-time constraints. - - // Define the guaranteed and max fraction of time for the audio thread. - // These "duty cycle" values can range from 0 to 1. A value of 0.5 - // means the scheduler would give half the time to the thread. - // These values have empirically been found to yield good behavior. - // Good means that audio performance is high and other threads won't starve. - const double kGuaranteedAudioDutyCycle = 0.75; - const double kMaxAudioDutyCycle = 0.85; - - // Define constants determining how much time the audio thread can - // use in a given time quantum. All times are in milliseconds. - - // About 128 frames @44.1KHz - const double kTimeQuantum = 2.9; - - // Time guaranteed each quantum. - const double kAudioTimeNeeded = kGuaranteedAudioDutyCycle * kTimeQuantum; - - // Maximum time each quantum. - const double kMaxTimeAllowed = kMaxAudioDutyCycle * kTimeQuantum; - - // Get the conversion factor from milliseconds to absolute time - // which is what the time-constraints call needs. - mach_timebase_info_data_t tb_info; - mach_timebase_info(&tb_info); - double ms_to_abs_time = - ((double)tb_info.denom / (double)tb_info.numer) * 1000000; - - thread_time_constraint_policy_data_t time_constraints; - time_constraints.period = (uint32_t)(kTimeQuantum * ms_to_abs_time); - time_constraints.computation = (uint32_t)(kAudioTimeNeeded * ms_to_abs_time); - time_constraints.constraint = (uint32_t)(kMaxTimeAllowed * ms_to_abs_time); - time_constraints.preemptible = 0; - - error = thread_policy_set(mach_thread_self(), - THREAD_TIME_CONSTRAINT_POLICY, - (thread_policy_t)&time_constraints, - THREAD_TIME_CONSTRAINT_POLICY_COUNT); - if (error != KERN_SUCCESS) { - mach_error("Couldn't set thread precedence policy", error); - } - - /* to kill a process, just increment the pt_callback_proc_id */ - /* printf("pt_callback_proc_id %d, id %d\n", pt_callback_proc_id, - parameters->id); */ - while (pt_callback_proc_id == parameters->id) { - /* wait for a multiple of resolution ms */ - UInt64 wait_time; - int delay = mytime++ * parameters->resolution - Pt_Time(); - PtTimestamp timestamp; - if (delay < 0) delay = 0; - wait_time = AudioConvertNanosToHostTime((UInt64)delay * NSEC_PER_MSEC); - wait_time += AudioGetCurrentHostTime(); - mach_wait_until(wait_time); - timestamp = Pt_Time(); - (*(parameters->callback))(timestamp, parameters->userData); - } - free(parameters); - return NULL; -} - - -PtError Pt_Start(int resolution, PtCallback *callback, void *userData) -{ - if (time_started_flag) return ptAlreadyStarted; - start_time = AudioGetCurrentHostTime(); - - if (callback) { - int res; - pt_callback_parameters *parms; - - parms = (pt_callback_parameters *) malloc(sizeof(pt_callback_parameters)); - if (!parms) return ptInsufficientMemory; - parms->id = pt_callback_proc_id; - parms->resolution = resolution; - parms->callback = callback; - parms->userData = userData; - -#ifdef HAVE_APPLE_QOS - pthread_attr_t qosAttribute; - pthread_attr_init(&qosAttribute); - pthread_attr_set_qos_class_np(&qosAttribute, - QOS_CLASS_USER_INTERACTIVE, 0); - - res = pthread_create(&pt_thread_pid, &qosAttribute, Pt_CallbackProc, - parms); -#else - res = pthread_create(&pt_thread_pid, NULL, Pt_CallbackProc, parms); -#endif - - struct sched_param sp; - memset(&sp, 0, sizeof(struct sched_param)); - sp.sched_priority = sched_get_priority_max(SCHED_RR); - if (pthread_setschedparam(pthread_self(), SCHED_RR, &sp) == -1) { - return ptHostError; - } - - if (res != 0) return ptHostError; - } - - time_started_flag = TRUE; - return ptNoError; -} - - -PtError Pt_Stop(void) -{ - /* printf("Pt_Stop called\n"); */ - pt_callback_proc_id++; - pthread_join(pt_thread_pid, NULL); - time_started_flag = FALSE; - return ptNoError; -} - - -int Pt_Started(void) -{ - return time_started_flag; -} - - -PtTimestamp Pt_Time(void) -{ - UInt64 clock_time, nsec_time; - clock_time = AudioGetCurrentHostTime() - start_time; - nsec_time = AudioConvertHostTimeToNanos(clock_time); - return (PtTimestamp)(nsec_time / NSEC_PER_MSEC); -} - - -void Pt_Sleep(int32_t duration) -{ - usleep(duration * 1000); -} -- cgit v1.2.3