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-rw-r--r--examples/redis-unstable/src/intset.c566
1 files changed, 0 insertions, 566 deletions
diff --git a/examples/redis-unstable/src/intset.c b/examples/redis-unstable/src/intset.c
deleted file mode 100644
index 6493eb0..0000000
--- a/examples/redis-unstable/src/intset.c
+++ /dev/null
@@ -1,566 +0,0 @@
-/*
- * Copyright (c) 2009-2012, Pieter Noordhuis <pcnoordhuis at gmail dot com>
- * Copyright (c) 2009-current, Redis Ltd.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * * Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * * Neither the name of Redis nor the names of its contributors may be used
- * to endorse or promote products derived from this software without
- * specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include "intset.h"
-#include "zmalloc.h"
-#include "endianconv.h"
-#include "redisassert.h"
-
-/* Note that these encodings are ordered, so:
- * INTSET_ENC_INT16 < INTSET_ENC_INT32 < INTSET_ENC_INT64. */
-#define INTSET_ENC_INT16 (sizeof(int16_t))
-#define INTSET_ENC_INT32 (sizeof(int32_t))
-#define INTSET_ENC_INT64 (sizeof(int64_t))
-
-/* Return the required encoding for the provided value. */
-static uint8_t _intsetValueEncoding(int64_t v) {
- if (v < INT32_MIN || v > INT32_MAX)
- return INTSET_ENC_INT64;
- else if (v < INT16_MIN || v > INT16_MAX)
- return INTSET_ENC_INT32;
- else
- return INTSET_ENC_INT16;
-}
-
-/* Return the value at pos, given an encoding. */
-static int64_t _intsetGetEncoded(intset *is, int pos, uint8_t enc) {
- int64_t v64;
- int32_t v32;
- int16_t v16;
-
- if (enc == INTSET_ENC_INT64) {
- memcpy(&v64,((int64_t*)is->contents)+pos,sizeof(v64));
- memrev64ifbe(&v64);
- return v64;
- } else if (enc == INTSET_ENC_INT32) {
- memcpy(&v32,((int32_t*)is->contents)+pos,sizeof(v32));
- memrev32ifbe(&v32);
- return v32;
- } else {
- memcpy(&v16,((int16_t*)is->contents)+pos,sizeof(v16));
- memrev16ifbe(&v16);
- return v16;
- }
-}
-
-/* Return the value at pos, using the configured encoding. */
-static int64_t _intsetGet(intset *is, int pos) {
- return _intsetGetEncoded(is,pos,intrev32ifbe(is->encoding));
-}
-
-/* Set the value at pos, using the configured encoding. */
-static void _intsetSet(intset *is, int pos, int64_t value) {
- uint32_t encoding = intrev32ifbe(is->encoding);
-
- if (encoding == INTSET_ENC_INT64) {
- ((int64_t*)is->contents)[pos] = value;
- memrev64ifbe(((int64_t*)is->contents)+pos);
- } else if (encoding == INTSET_ENC_INT32) {
- ((int32_t*)is->contents)[pos] = value;
- memrev32ifbe(((int32_t*)is->contents)+pos);
- } else {
- ((int16_t*)is->contents)[pos] = value;
- memrev16ifbe(((int16_t*)is->contents)+pos);
- }
-}
-
-/* Create an empty intset. */
-intset *intsetNew(void) {
- intset *is = zmalloc(sizeof(intset));
- is->encoding = intrev32ifbe(INTSET_ENC_INT16);
- is->length = 0;
- return is;
-}
-
-size_t intsetAllocSize(intset *is) {
- uint64_t size = (uint64_t)intrev32ifbe(is->length)*intrev32ifbe(is->encoding);
- assert(size <= SIZE_MAX - sizeof(intset));
- return sizeof(intset)+size;
-}
-
-/* Resize the intset */
-static intset *intsetResize(intset *is, uint32_t len) {
- uint64_t size = (uint64_t)len*intrev32ifbe(is->encoding);
- assert(size <= SIZE_MAX - sizeof(intset));
- is = zrealloc(is,sizeof(intset)+size);
- return is;
-}
-
-/* Search for the position of "value". Return 1 when the value was found and
- * sets "pos" to the position of the value within the intset. Return 0 when
- * the value is not present in the intset and sets "pos" to the position
- * where "value" can be inserted. */
-static uint8_t intsetSearch(intset *is, int64_t value, uint32_t *pos) {
- int min = 0, max = intrev32ifbe(is->length)-1, mid = -1;
- int64_t cur = -1;
-
- /* The value can never be found when the set is empty */
- if (intrev32ifbe(is->length) == 0) {
- if (pos) *pos = 0;
- return 0;
- } else {
- /* Check for the case where we know we cannot find the value,
- * but do know the insert position. */
- if (value > _intsetGet(is,max)) {
- if (pos) *pos = intrev32ifbe(is->length);
- return 0;
- } else if (value < _intsetGet(is,0)) {
- if (pos) *pos = 0;
- return 0;
- }
- }
-
- while(max >= min) {
- mid = ((unsigned int)min + (unsigned int)max) >> 1;
- cur = _intsetGet(is,mid);
- if (value > cur) {
- min = mid+1;
- } else if (value < cur) {
- max = mid-1;
- } else {
- break;
- }
- }
-
- if (value == cur) {
- if (pos) *pos = mid;
- return 1;
- } else {
- if (pos) *pos = min;
- return 0;
- }
-}
-
-/* Upgrades the intset to a larger encoding and inserts the given integer. */
-static intset *intsetUpgradeAndAdd(intset *is, int64_t value) {
- uint8_t curenc = intrev32ifbe(is->encoding);
- uint8_t newenc = _intsetValueEncoding(value);
- int length = intrev32ifbe(is->length);
- int prepend = value < 0 ? 1 : 0;
-
- /* First set new encoding and resize */
- is->encoding = intrev32ifbe(newenc);
- is = intsetResize(is,intrev32ifbe(is->length)+1);
-
- /* Upgrade back-to-front so we don't overwrite values.
- * Note that the "prepend" variable is used to make sure we have an empty
- * space at either the beginning or the end of the intset. */
- while(length--)
- _intsetSet(is,length+prepend,_intsetGetEncoded(is,length,curenc));
-
- /* Set the value at the beginning or the end. */
- if (prepend)
- _intsetSet(is,0,value);
- else
- _intsetSet(is,intrev32ifbe(is->length),value);
- is->length = intrev32ifbe(intrev32ifbe(is->length)+1);
- return is;
-}
-
-static void intsetMoveTail(intset *is, uint32_t from, uint32_t to) {
- void *src, *dst;
- uint32_t bytes = intrev32ifbe(is->length)-from;
- uint32_t encoding = intrev32ifbe(is->encoding);
-
- if (encoding == INTSET_ENC_INT64) {
- src = (int64_t*)is->contents+from;
- dst = (int64_t*)is->contents+to;
- bytes *= sizeof(int64_t);
- } else if (encoding == INTSET_ENC_INT32) {
- src = (int32_t*)is->contents+from;
- dst = (int32_t*)is->contents+to;
- bytes *= sizeof(int32_t);
- } else {
- src = (int16_t*)is->contents+from;
- dst = (int16_t*)is->contents+to;
- bytes *= sizeof(int16_t);
- }
- memmove(dst,src,bytes);
-}
-
-/* Insert an integer in the intset */
-intset *intsetAdd(intset *is, int64_t value, uint8_t *success) {
- uint8_t valenc = _intsetValueEncoding(value);
- uint32_t pos;
- if (success) *success = 1;
-
- /* Upgrade encoding if necessary. If we need to upgrade, we know that
- * this value should be either appended (if > 0) or prepended (if < 0),
- * because it lies outside the range of existing values. */
- if (valenc > intrev32ifbe(is->encoding)) {
- /* This always succeeds, so we don't need to curry *success. */
- return intsetUpgradeAndAdd(is,value);
- } else {
- /* Abort if the value is already present in the set.
- * This call will populate "pos" with the right position to insert
- * the value when it cannot be found. */
- if (intsetSearch(is,value,&pos)) {
- if (success) *success = 0;
- return is;
- }
-
- is = intsetResize(is,intrev32ifbe(is->length)+1);
- if (pos < intrev32ifbe(is->length)) intsetMoveTail(is,pos,pos+1);
- }
-
- _intsetSet(is,pos,value);
- is->length = intrev32ifbe(intrev32ifbe(is->length)+1);
- return is;
-}
-
-/* Delete integer from intset */
-intset *intsetRemove(intset *is, int64_t value, int *success) {
- uint8_t valenc = _intsetValueEncoding(value);
- uint32_t pos;
- if (success) *success = 0;
-
- if (valenc <= intrev32ifbe(is->encoding) && intsetSearch(is,value,&pos)) {
- uint32_t len = intrev32ifbe(is->length);
-
- /* We know we can delete */
- if (success) *success = 1;
-
- /* Overwrite value with tail and update length */
- if (pos < (len-1)) intsetMoveTail(is,pos+1,pos);
- is = intsetResize(is,len-1);
- is->length = intrev32ifbe(len-1);
- }
- return is;
-}
-
-/* Determine whether a value belongs to this set */
-uint8_t intsetFind(intset *is, int64_t value) {
- uint8_t valenc = _intsetValueEncoding(value);
- return valenc <= intrev32ifbe(is->encoding) && intsetSearch(is,value,NULL);
-}
-
-/* Return random member */
-int64_t intsetRandom(intset *is) {
- uint32_t len = intrev32ifbe(is->length);
- assert(len); /* avoid division by zero on corrupt intset payload. */
- return _intsetGet(is,rand()%len);
-}
-
-/* Return the largest member. */
-int64_t intsetMax(intset *is) {
- uint32_t len = intrev32ifbe(is->length);
- return _intsetGet(is, len - 1);
-}
-
-/* Return the smallest member. */
-int64_t intsetMin(intset *is) {
- return _intsetGet(is, 0);
-}
-
-/* Get the value at the given position. When this position is
- * out of range the function returns 0, when in range it returns 1. */
-uint8_t intsetGet(intset *is, uint32_t pos, int64_t *value) {
- if (pos < intrev32ifbe(is->length)) {
- *value = _intsetGet(is,pos);
- return 1;
- }
- return 0;
-}
-
-/* Return intset length */
-uint32_t intsetLen(const intset *is) {
- return intrev32ifbe(is->length);
-}
-
-/* Return intset blob size in bytes. */
-size_t intsetBlobLen(intset *is) {
- return sizeof(intset)+(size_t)intrev32ifbe(is->length)*intrev32ifbe(is->encoding);
-}
-
-/* Validate the integrity of the data structure.
- * when `deep` is 0, only the integrity of the header is validated.
- * when `deep` is 1, we make sure there are no duplicate or out of order records. */
-int intsetValidateIntegrity(const unsigned char *p, size_t size, int deep) {
- intset *is = (intset *)p;
- /* check that we can actually read the header. */
- if (size < sizeof(*is))
- return 0;
-
- uint32_t encoding = intrev32ifbe(is->encoding);
-
- size_t record_size;
- if (encoding == INTSET_ENC_INT64) {
- record_size = INTSET_ENC_INT64;
- } else if (encoding == INTSET_ENC_INT32) {
- record_size = INTSET_ENC_INT32;
- } else if (encoding == INTSET_ENC_INT16){
- record_size = INTSET_ENC_INT16;
- } else {
- return 0;
- }
-
- /* check that the size matches (all records are inside the buffer). */
- uint32_t count = intrev32ifbe(is->length);
- if (sizeof(*is) + count*record_size != size)
- return 0;
-
- /* check that the set is not empty. */
- if (count==0)
- return 0;
-
- if (!deep)
- return 1;
-
- /* check that there are no dup or out of order records. */
- int64_t prev = _intsetGet(is,0);
- for (uint32_t i=1; i<count; i++) {
- int64_t cur = _intsetGet(is,i);
- if (cur <= prev)
- return 0;
- prev = cur;
- }
-
- return 1;
-}
-
-#ifdef REDIS_TEST
-#include <sys/time.h>
-#include <time.h>
-
-#if 0
-static void intsetRepr(intset *is) {
- for (uint32_t i = 0; i < intrev32ifbe(is->length); i++) {
- printf("%lld\n", (uint64_t)_intsetGet(is,i));
- }
- printf("\n");
-}
-
-static void error(char *err) {
- printf("%s\n", err);
- exit(1);
-}
-#endif
-
-static void ok(void) {
- printf("OK\n");
-}
-
-static long long usec(void) {
- struct timeval tv;
- gettimeofday(&tv,NULL);
- return (((long long)tv.tv_sec)*1000000)+tv.tv_usec;
-}
-
-static intset *createSet(int bits, int size) {
- uint64_t mask = (1<<bits)-1;
- uint64_t value;
- intset *is = intsetNew();
-
- for (int i = 0; i < size; i++) {
- if (bits > 32) {
- value = (rand()*rand()) & mask;
- } else {
- value = rand() & mask;
- }
- is = intsetAdd(is,value,NULL);
- }
- return is;
-}
-
-static void checkConsistency(intset *is) {
- for (uint32_t i = 0; i < (intrev32ifbe(is->length)-1); i++) {
- uint32_t encoding = intrev32ifbe(is->encoding);
-
- if (encoding == INTSET_ENC_INT16) {
- int16_t *i16 = (int16_t*)is->contents;
- assert(i16[i] < i16[i+1]);
- } else if (encoding == INTSET_ENC_INT32) {
- int32_t *i32 = (int32_t*)is->contents;
- assert(i32[i] < i32[i+1]);
- } else {
- int64_t *i64 = (int64_t*)is->contents;
- assert(i64[i] < i64[i+1]);
- }
- }
-}
-
-#define UNUSED(x) (void)(x)
-int intsetTest(int argc, char **argv, int flags) {
- uint8_t success;
- int i;
- intset *is;
- srand(time(NULL));
-
- UNUSED(argc);
- UNUSED(argv);
- UNUSED(flags);
-
- printf("Value encodings: "); {
- assert(_intsetValueEncoding(-32768) == INTSET_ENC_INT16);
- assert(_intsetValueEncoding(+32767) == INTSET_ENC_INT16);
- assert(_intsetValueEncoding(-32769) == INTSET_ENC_INT32);
- assert(_intsetValueEncoding(+32768) == INTSET_ENC_INT32);
- assert(_intsetValueEncoding(-2147483648) == INTSET_ENC_INT32);
- assert(_intsetValueEncoding(+2147483647) == INTSET_ENC_INT32);
- assert(_intsetValueEncoding(-2147483649) == INTSET_ENC_INT64);
- assert(_intsetValueEncoding(+2147483648) == INTSET_ENC_INT64);
- assert(_intsetValueEncoding(-9223372036854775808ull) ==
- INTSET_ENC_INT64);
- assert(_intsetValueEncoding(+9223372036854775807ull) ==
- INTSET_ENC_INT64);
- ok();
- }
-
- printf("Basic adding: "); {
- is = intsetNew();
- is = intsetAdd(is,5,&success); assert(success);
- is = intsetAdd(is,6,&success); assert(success);
- is = intsetAdd(is,4,&success); assert(success);
- is = intsetAdd(is,4,&success); assert(!success);
- assert(6 == intsetMax(is));
- assert(4 == intsetMin(is));
- ok();
- zfree(is);
- }
-
- printf("Large number of random adds: "); {
- uint32_t inserts = 0;
- is = intsetNew();
- for (i = 0; i < 1024; i++) {
- is = intsetAdd(is,rand()%0x800,&success);
- if (success) inserts++;
- }
- assert(intrev32ifbe(is->length) == inserts);
- checkConsistency(is);
- ok();
- zfree(is);
- }
-
- printf("Upgrade from int16 to int32: "); {
- is = intsetNew();
- is = intsetAdd(is,32,NULL);
- assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT16);
- is = intsetAdd(is,65535,NULL);
- assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT32);
- assert(intsetFind(is,32));
- assert(intsetFind(is,65535));
- checkConsistency(is);
- zfree(is);
-
- is = intsetNew();
- is = intsetAdd(is,32,NULL);
- assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT16);
- is = intsetAdd(is,-65535,NULL);
- assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT32);
- assert(intsetFind(is,32));
- assert(intsetFind(is,-65535));
- checkConsistency(is);
- ok();
- zfree(is);
- }
-
- printf("Upgrade from int16 to int64: "); {
- is = intsetNew();
- is = intsetAdd(is,32,NULL);
- assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT16);
- is = intsetAdd(is,4294967295,NULL);
- assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT64);
- assert(intsetFind(is,32));
- assert(intsetFind(is,4294967295));
- checkConsistency(is);
- zfree(is);
-
- is = intsetNew();
- is = intsetAdd(is,32,NULL);
- assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT16);
- is = intsetAdd(is,-4294967295,NULL);
- assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT64);
- assert(intsetFind(is,32));
- assert(intsetFind(is,-4294967295));
- checkConsistency(is);
- ok();
- zfree(is);
- }
-
- printf("Upgrade from int32 to int64: "); {
- is = intsetNew();
- is = intsetAdd(is,65535,NULL);
- assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT32);
- is = intsetAdd(is,4294967295,NULL);
- assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT64);
- assert(intsetFind(is,65535));
- assert(intsetFind(is,4294967295));
- checkConsistency(is);
- zfree(is);
-
- is = intsetNew();
- is = intsetAdd(is,65535,NULL);
- assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT32);
- is = intsetAdd(is,-4294967295,NULL);
- assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT64);
- assert(intsetFind(is,65535));
- assert(intsetFind(is,-4294967295));
- checkConsistency(is);
- ok();
- zfree(is);
- }
-
- printf("Stress lookups: "); {
- long num = 100000, size = 10000;
- int i, bits = 20;
- long long start;
- is = createSet(bits,size);
- checkConsistency(is);
-
- start = usec();
- for (i = 0; i < num; i++) intsetSearch(is,rand() % ((1<<bits)-1),NULL);
- printf("%ld lookups, %ld element set, %lldusec\n",
- num,size,usec()-start);
- zfree(is);
- }
-
- printf("Stress add+delete: "); {
- int i, v1, v2;
- is = intsetNew();
- for (i = 0; i < 0xffff; i++) {
- v1 = rand() % 0xfff;
- is = intsetAdd(is,v1,NULL);
- assert(intsetFind(is,v1));
-
- v2 = rand() % 0xfff;
- is = intsetRemove(is,v2,NULL);
- assert(!intsetFind(is,v2));
- }
- checkConsistency(is);
- ok();
- zfree(is);
- }
-
- return 0;
-}
-#endif
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