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/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2011 Data Differential, http://datadifferential.com/
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* * The names of its contributors may not be used to endorse or
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* promote products derived from this software without specific prior
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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#include <libmemcachedprotocol/common.h>
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const uint64_t redzone_pattern = 0xdeadbeefcafebabe;
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const size_t initial_pool_size = 64;
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cache_t* cache_create(const char *name, size_t bufsize, size_t align,
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cache_constructor_t* constructor,
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cache_destructor_t* destructor) {
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cache_t* ret = calloc(1, sizeof(cache_t));
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size_t name_length= strlen(name);
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char* nm= calloc(1, (sizeof(char) * name_length) +1);
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memcpy(nm, name, name_length);
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void** ptr = calloc(initial_pool_size, bufsize);
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if (ret == NULL || nm == NULL || ptr == NULL ||
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pthread_mutex_init(&ret->mutex, NULL) == -1) {
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ret->freetotal = initial_pool_size;
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ret->constructor = constructor;
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ret->destructor = destructor;
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ret->bufsize = bufsize + 2 * sizeof(redzone_pattern);
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ret->bufsize = bufsize;
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static inline void* get_object(void *ptr) {
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void cache_destroy(cache_t *cache) {
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while (cache->freecurr > 0) {
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void *ptr = cache->ptr[--cache->freecurr];
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if (cache->destructor) {
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cache->destructor(get_object(ptr), NULL);
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pthread_mutex_destroy(&cache->mutex);
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void* cache_alloc(cache_t *cache) {
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pthread_mutex_lock(&cache->mutex);
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if (cache->freecurr > 0) {
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ret = cache->ptr[--cache->freecurr];
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object = get_object(ret);
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object = ret = malloc(cache->bufsize);
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object = get_object(ret);
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if (cache->constructor != NULL &&
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cache->constructor(object, NULL, 0) != 0) {
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pthread_mutex_unlock(&cache->mutex);
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if (object != NULL) {
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/* add a simple form of buffer-check */
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*pre = redzone_pattern;
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memcpy(((char*)ret) + cache->bufsize - (2 * sizeof(redzone_pattern)),
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&redzone_pattern, sizeof(redzone_pattern));
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void cache_free(cache_t *cache, void *ptr) {
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pthread_mutex_lock(&cache->mutex);
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/* validate redzone... */
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if (memcmp(((char*)ptr) + cache->bufsize - (2 * sizeof(redzone_pattern)),
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&redzone_pattern, sizeof(redzone_pattern)) != 0) {
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pthread_mutex_unlock(&cache->mutex);
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if (*pre != redzone_pattern) {
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pthread_mutex_unlock(&cache->mutex);
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if (cache->freecurr < cache->freetotal) {
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cache->ptr[cache->freecurr++] = ptr;
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/* try to enlarge free connections array */
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size_t newtotal = cache->freetotal * 2;
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void **new_free = realloc(cache->ptr, sizeof(char *) * newtotal);
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cache->freetotal = newtotal;
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cache->ptr = new_free;
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cache->ptr[cache->freecurr++] = ptr;
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if (cache->destructor) {
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cache->destructor(ptr, NULL);
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pthread_mutex_unlock(&cache->mutex);