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/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <inttypes.h>
#ifndef bool
#define bool char
#define false 0
#define true 1
#endif
#define NDEBUG 1
#ifndef NDEBUG
#include <signal.h>
#endif
#include "cache.h"
#ifndef NDEBUG
const uint64_t redzone_pattern = 0xdeadbeefcafebabe;
int cache_error = 0;
#endif
const int initial_pool_size = 64;
#ifndef NDEBUG
static bool inFreeList(cache_t *cache, void *object) {
bool rv = false;
for (int i = 0; i < cache->freecurr; i++) {
rv |= cache->ptr[i] == object;
}
return rv;
}
#endif
cache_t* cache_create(const char *name, size_t bufsize, size_t align,
cache_constructor_t* constructor,
cache_destructor_t* destructor) {
cache_t* ret = calloc(1, sizeof(cache_t));
char* nm = strdup(name);
void** ptr = calloc(initial_pool_size, sizeof(void*));
if (ret == NULL || nm == NULL || ptr == NULL ||
pthread_mutex_init(&ret->mutex, NULL) == -1) {
free(ret);
free(nm);
free(ptr);
return NULL;
}
ret->name = nm;
ret->ptr = ptr;
ret->freetotal = initial_pool_size;
ret->constructor = constructor;
ret->destructor = destructor;
#ifndef NDEBUG
ret->bufsize = bufsize + 2 * sizeof(redzone_pattern);
#else
ret->bufsize = bufsize;
#endif
return ret;
}
static inline void* get_object(void *ptr) {
#ifndef NDEBUG
uint64_t *pre = ptr;
return pre + 1;
#else
return ptr;
#endif
}
void cache_destroy(cache_t *cache) {
while (cache->freecurr > 0) {
void *ptr = cache->ptr[--cache->freecurr];
if (cache->destructor) {
cache->destructor(get_object(ptr), NULL);
}
free(ptr);
}
free(cache->name);
free(cache->ptr);
pthread_mutex_destroy(&cache->mutex);
}
void* cache_alloc(cache_t *cache) {
void *ret;
void *object;
pthread_mutex_lock(&cache->mutex);
if (cache->freecurr > 0) {
ret = cache->ptr[--cache->freecurr];
object = get_object(ret);
#ifndef NDEBUG
assert(!inFreeList(cache, ret));
#endif
} else {
object = ret = malloc(cache->bufsize);
if (ret != NULL) {
object = get_object(ret);
if (cache->constructor != NULL &&
cache->constructor(object, NULL, 0) != 0) {
free(ret);
object = NULL;
}
}
}
pthread_mutex_unlock(&cache->mutex);
#ifndef NDEBUG
if (object != NULL) {
/* add a simple form of buffer-check */
uint64_t *pre = ret;
*pre = redzone_pattern;
ret = pre+1;
memcpy(((char*)ret) + cache->bufsize - (2 * sizeof(redzone_pattern)),
&redzone_pattern, sizeof(redzone_pattern));
}
#endif
return object;
}
void cache_free(cache_t *cache, void *object) {
void *ptr = object;
pthread_mutex_lock(&cache->mutex);
#ifndef NDEBUG
/* validate redzone... */
if (memcmp(((char*)ptr) + cache->bufsize - (2 * sizeof(redzone_pattern)),
&redzone_pattern, sizeof(redzone_pattern)) != 0) {
raise(SIGABRT);
cache_error = 1;
pthread_mutex_unlock(&cache->mutex);
return;
}
uint64_t *pre = ptr;
--pre;
if (*pre != redzone_pattern) {
raise(SIGABRT);
cache_error = -1;
pthread_mutex_unlock(&cache->mutex);
return;
}
ptr = pre;
#endif
#ifndef NDEBUG
assert(!inFreeList(cache, ptr));
#endif
if (cache->freecurr < cache->freetotal) {
cache->ptr[cache->freecurr++] = ptr;
#ifndef NDEBUG
assert(inFreeList(cache, ptr));
#endif
} else {
/* try to enlarge free connections array */
size_t newtotal = cache->freetotal * 2;
void **new_free = realloc(cache->ptr, sizeof(char *) * newtotal);
if (new_free) {
cache->freetotal = newtotal;
cache->ptr = new_free;
cache->ptr[cache->freecurr++] = ptr;
#ifndef NDEBUG
assert(inFreeList(cache, ptr));
#endif
} else {
if (cache->destructor) {
cache->destructor(ptr, NULL);
}
free(ptr);
#ifndef NDEBUG
assert(!inFreeList(cache, ptr));
#endif
}
}
pthread_mutex_unlock(&cache->mutex);
}
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