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apc_cache.c
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/*
+----------------------------------------------------------------------+
| APC |
+----------------------------------------------------------------------+
| Copyright (c) 2006-2011 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http:www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Daniel Cowgill <dcowgill@communityconnect.com> |
| Rasmus Lerdorf <rasmus@php.net> |
| Arun C. Murthy <arunc@yahoo-inc.com> |
| Gopal Vijayaraghavan <gopalv@yahoo-inc.com> |
+----------------------------------------------------------------------+
This software was contributed to PHP by Community Connect Inc. in 2002
and revised in 2005 by Yahoo! Inc. to add support for PHP 5.1.
Future revisions and derivatives of this source code must acknowledge
Community Connect Inc. as the original contributor of this module by
leaving this note intact in the source code.
All other licensing and usage conditions are those of the PHP Group.
*/
/* $Id: apc_cache.c 328743 2012-12-12 07:58:32Z ab $ */
#include "apc_cache.h"
#include "apc_sma.h"
#include "apc_globals.h"
#include "php_scandir.h"
#include "SAPI.h"
#include "TSRM.h"
#include "php_main.h"
#include "ext/standard/md5.h"
#include "ext/standard/php_var.h"
#include "zend_smart_str.h"
typedef void* (*ht_copy_fun_t)(void*, void*, apc_context_t*);
typedef int (*ht_check_copy_fun_t)(Bucket*, va_list);
#define CHECK(p) { if ((p) == NULL) return NULL; }
static APC_HOTSPOT void my_copy_zval(zval* dst, const zval* src, apc_context_t* ctxt);
/* {{{ make_prime */
static int const primes[] = {
257, /* 256 */
521, /* 512 */
1031, /* 1024 */
2053, /* 2048 */
3079, /* 3072 */
4099, /* 4096 */
5147, /* 5120 */
6151, /* 6144 */
7177, /* 7168 */
8209, /* 8192 */
9221, /* 9216 */
10243, /* 10240 */
11273, /* 11264 */
12289, /* 12288 */
13313, /* 13312 */
14341, /* 14336 */
15361, /* 15360 */
16411, /* 16384 */
17417, /* 17408 */
18433, /* 18432 */
19457, /* 19456 */
20483, /* 20480 */
30727, /* 30720 */
40961, /* 40960 */
61441, /* 61440 */
81929, /* 81920 */
122887,/* 122880 */
163841,/* 163840 */
245771,/* 245760 */
327689,/* 327680 */
491527,/* 491520 */
655373,/* 655360 */
983063,/* 983040 */
0 /* sentinel */
};
static int make_prime(int n)
{
int *k = (int*)primes;
while(*k) {
if((*k) > n) return *k;
k++;
}
return *(k-1);
}
/* }}} */
/* {{{ make_slot */
apc_cache_slot_t* make_slot(apc_cache_t* cache, apc_cache_key_t *key, apc_cache_entry_t* value, apc_cache_slot_t* next, time_t t)
{
apc_cache_slot_t* p = NULL;
/* allocate slot */
if ((p = value->pool->palloc(value->pool, sizeof(apc_cache_slot_t)))) {
/* copy identifier */
zend_string *copiedKey = apc_pstrcpy(key->str, value->pool);
if (copiedKey) {
/* set slot data */
p->key = key[0];
p->key.str = copiedKey;
p->value = value;
/* set slot relation */
p->next = next;
/* set slot defaults */
p->nhits = 0;
p->ctime = t;
p->atime = t;
p->dtime = 0;
}
}
return p;
}
/* }}} */
/* {{{ free_slot */
static void free_slot(apc_cache_slot_t* slot)
{
/* destroy slot pool */
apc_pool_destroy(
slot->value->pool);
}
/* }}} */
/* {{{ apc_cache_hash_slot
Note: These calculations can and should be done outside of a lock */
static void apc_cache_hash_slot(apc_cache_t* cache,
zend_string *key,
zend_ulong* hash,
zend_ulong* slot) {
(*hash) = ZSTR_HASH(key);
(*slot) = (*hash) % (cache->nslots);
} /* }}} */
/* {{{ apc_cache_remove_slot */
PHP_APCU_API void apc_cache_remove_slot(apc_cache_t* cache, apc_cache_slot_t** slot)
{
apc_cache_slot_t* dead = *slot;
/* think here is safer */
*slot = (*slot)->next;
/* adjust header info */
if (cache->header->mem_size)
cache->header->mem_size -= dead->value->mem_size;
if (cache->header->nentries)
cache->header->nentries--;
/* remove if there are no references */
if (dead->value->ref_count <= 0) {
free_slot(dead);
} else {
/* add to gc if there are still refs */
dead->next = cache->header->gc;
dead->dtime = time(0);
cache->header->gc = dead;
}
}
/* }}} */
/* {{{ apc_cache_gc */
PHP_APCU_API void apc_cache_gc(apc_cache_t* cache)
{
/* This function scans the list of removed cache entries and deletes any
* entry whose reference count is zero or that has been on the gc
* list for more than cache->gc_ttl seconds
* (we issue a warning in the latter case).
*/
if (!cache || !cache->header->gc) {
return;
}
{
apc_cache_slot_t** slot = &cache->header->gc;
while (*slot != NULL) {
time_t now = time(0);
time_t gc_sec = cache->gc_ttl ? (now - (*slot)->dtime) : 0;
if (!(*slot)->value->ref_count || gc_sec > (time_t)cache->gc_ttl) {
apc_cache_slot_t* dead = *slot;
/* good ol' whining */
if (dead->value->ref_count > 0) {
apc_debug(
"GC cache entry '%s' was on gc-list for %d seconds",
dead->key.str, gc_sec
);
}
/* set next slot */
*slot = dead->next;
/* free slot */
free_slot(
dead);
/* next */
continue;
} else {
slot = &(*slot)->next;
}
}
}
}
/* }}} */
/* {{{ php serializer */
PHP_APCU_API int APC_SERIALIZER_NAME(php) (APC_SERIALIZER_ARGS)
{
smart_str strbuf = {0};
php_serialize_data_t var_hash;
PHP_VAR_SERIALIZE_INIT(var_hash);
php_var_serialize(&strbuf, (zval*) value, &var_hash);
PHP_VAR_SERIALIZE_DESTROY(var_hash);
if(strbuf.s->val) {
*buf = (unsigned char *)estrndup(ZSTR_VAL(strbuf.s), ZSTR_LEN(strbuf.s));
*buf_len = ZSTR_LEN(strbuf.s);
smart_str_free(&strbuf);
return 1;
}
return 0;
} /* }}} */
/* {{{ php unserializer */
PHP_APCU_API int APC_UNSERIALIZER_NAME(php) (APC_UNSERIALIZER_ARGS)
{
const unsigned char *tmp = buf;
php_unserialize_data_t var_hash;
PHP_VAR_UNSERIALIZE_INIT(var_hash);
if(!php_var_unserialize(value, &tmp, buf + buf_len, &var_hash)) {
PHP_VAR_UNSERIALIZE_DESTROY(var_hash);
php_error_docref(NULL, E_NOTICE, "Error at offset %ld of %ld bytes", (zend_long)(tmp - buf), (zend_long)buf_len);
ZVAL_NULL(value);
return 0;
}
PHP_VAR_UNSERIALIZE_DESTROY(var_hash);
return 1;
} /* }}} */
/* {{{ apc_cache_create */
PHP_APCU_API apc_cache_t* apc_cache_create(apc_sma_t* sma, apc_serializer_t* serializer, zend_long size_hint, zend_long gc_ttl, zend_long ttl, zend_long smart, zend_bool defend) {
apc_cache_t* cache;
zend_long cache_size;
zend_long nslots;
/* calculate number of slots */
nslots = make_prime(size_hint > 0 ? size_hint : 2000);
/* allocate pointer by normal means */
cache = (apc_cache_t*) apc_emalloc(sizeof(apc_cache_t));
/* calculate cache size for shm allocation */
cache_size = sizeof(apc_cache_header_t) + nslots*sizeof(apc_cache_slot_t*);
/* allocate shm */
cache->shmaddr = sma->smalloc(cache_size);
if(!cache->shmaddr) {
apc_error("Unable to allocate shared memory for cache structures. (Perhaps your shared memory size isn't large enough?). ");
return NULL;
}
/* zero shm */
memset(cache->shmaddr, 0, cache_size);
/* set default header */
cache->header = (apc_cache_header_t*) cache->shmaddr;
cache->header->nhits = 0;
cache->header->nmisses = 0;
cache->header->nentries = 0;
cache->header->nexpunges = 0;
cache->header->gc = NULL;
cache->header->stime = time(NULL);
cache->header->state |= APC_CACHE_ST_NONE;
/* set cache options */
cache->slots = (apc_cache_slot_t**) (((char*) cache->shmaddr) + sizeof(apc_cache_header_t));
cache->sma = sma;
cache->serializer = serializer;
cache->nslots = nslots;
cache->gc_ttl = gc_ttl;
cache->ttl = ttl;
cache->smart = smart;
cache->defend = defend;
/* header lock */
CREATE_LOCK(&cache->header->lock);
/* zero slots */
memset(cache->slots, 0, sizeof(apc_cache_slot_t*)*nslots);
return cache;
} /* }}} */
static inline zend_bool apc_cache_insert_internal(apc_cache_t* cache,
apc_cache_key_t *key,
apc_cache_entry_t* value,
apc_context_t* ctxt,
time_t t,
zend_bool exclusive) {
/* at least */
if (!value) {
return 0;
}
/* check we are able to deal with this request */
if (!cache || apc_cache_busy(cache)) {
return 0;
}
/* process deleted list */
apc_cache_gc(cache);
/* make the insertion */
{
apc_cache_slot_t** slot;
/*
* select appropriate slot ...
*/
slot = &cache->slots[ZSTR_HASH(key->str) % cache->nslots];
while (*slot) {
/* check for a match by hash and string */
if ((ZSTR_HASH((*slot)->key.str) == ZSTR_HASH(key->str)) &&
memcmp(ZSTR_VAL((*slot)->key.str), ZSTR_VAL(key->str), ZSTR_LEN(key->str)) == SUCCESS) {
/*
* At this point we have found the user cache entry. If we are doing
* an exclusive insert (apc_add) we are going to bail right away if
* the user entry already exists and it has no ttl, or
* there is a ttl and the entry has not timed out yet.
*/
if(exclusive) {
if (!(*slot)->value->ttl || (time_t) ((*slot)->ctime + (*slot)->value->ttl) >= t) {
return 0;
}
}
apc_cache_remove_slot(cache, slot);
break;
} else
/*
* This is a bit nasty. The idea here is to do runtime cleanup of the linked list of
* slot entries so we don't always have to skip past a bunch of stale entries. We check
* for staleness here and get rid of them by first checking to see if the cache has a global
* access ttl on it and removing entries that haven't been accessed for ttl seconds and secondly
* we see if the entry has a hard ttl on it and remove it if it has been around longer than its ttl
*/
if((cache->ttl && (time_t)(*slot)->atime < (t - (time_t)cache->ttl)) ||
((*slot)->value->ttl && (time_t) ((*slot)->ctime + (*slot)->value->ttl) < t)) {
apc_cache_remove_slot(cache, slot);
continue;
}
/* set next slot */
slot = &(*slot)->next;
}
if ((*slot = make_slot(cache, key, value, *slot, t)) != NULL) {
/* set value size from pool size */
value->mem_size = ctxt->pool->size;
cache->header->mem_size += ctxt->pool->size;
cache->header->nentries++;
cache->header->ninserts++;
} else {
return 0;
}
}
return 1;
}
static inline zend_bool apc_cache_store_internal(apc_cache_t *cache, zend_string *strkey, const zval *val, const int32_t ttl, const zend_bool exclusive) {
apc_cache_entry_t *entry;
apc_cache_key_t key;
time_t t;
apc_context_t ctxt={0,};
zend_bool ret = 0;
t = apc_time();
/* initialize a context suitable for making an insert */
if (apc_cache_make_context(cache, &ctxt, APC_CONTEXT_SHARE, APC_SMALL_POOL, APC_COPY_IN, 0)) {
/* initialize the key for insertion */
if (apc_cache_make_key(&key, strkey)) {
/* run cache defense */
if (!apc_cache_defense(cache, &key)) {
/* initialize the entry for insertion */
if ((entry = apc_cache_make_entry(&ctxt, &key, val, ttl))) {
/* execute an insertion */
if (apc_cache_insert_internal(cache, &key, entry, &ctxt, t, exclusive)) {
ret = 1;
}
}
}
}
/* in any case of failure the context should be destroyed */
if (!ret) {
apc_cache_destroy_context(&ctxt);
}
}
return ret;
}
static inline apc_cache_entry_t* apc_cache_find_internal(apc_cache_t *cache, zend_string *key, time_t t, zend_bool lock) {
apc_cache_slot_t** slot;
zend_ulong h, s;
volatile apc_cache_entry_t* value = NULL;
if (lock)
APC_RLOCK(cache->header);
/* calculate hash and slot */
apc_cache_hash_slot(cache, key, &h, &s);
/* find head */
slot = &cache->slots[s];
while (*slot) {
/* check for a matching key by has and identifier */
if ((h == ZSTR_HASH((*slot)->key.str)) &&
memcmp(ZSTR_VAL((*slot)->key.str), ZSTR_VAL(key), ZSTR_LEN(key)) == SUCCESS) {
/* Check to make sure this entry isn't expired by a hard TTL */
if((*slot)->value->ttl && (time_t) ((*slot)->ctime + (*slot)->value->ttl) < t) {
/* increment misses on cache */
ATOMIC_INC(cache, cache->header->nmisses);
if (lock)
APC_RUNLOCK(cache->header);
return NULL;
}
/* set cache num hits */
ATOMIC_INC(cache, cache->header->nhits);
/* grab value */
value = (*slot)->value;
(*slot)->atime = t;
/* Otherwise we are fine, increase counters and return the cache entry */
ATOMIC_INC(cache, (*slot)->nhits);
ATOMIC_INC(cache, (*slot)->value->ref_count);
if (lock)
APC_RUNLOCK(cache->header);
return (apc_cache_entry_t*)value;
}
/* next */
slot = &(*slot)->next;
}
/* not found, so increment misses */
ATOMIC_INC(cache, cache->header->nmisses);
if (lock)
APC_RUNLOCK(cache->header);
return NULL;
}
static inline zend_bool apc_cache_fetch_internal(apc_cache_t* cache, zend_string *key, apc_cache_entry_t *entry, time_t t, zval **dst) {
/* context for copying out */
apc_context_t ctxt = {0, };
/* create unpool context */
if (apc_cache_make_context(cache, &ctxt, APC_CONTEXT_NOSHARE, APC_UNPOOL, APC_COPY_OUT, 0)) {
/* copy to destination */
apc_cache_fetch_zval(&ctxt, *dst, &entry->val);
/* release entry */
apc_cache_release(cache, entry);
/* destroy context */
apc_cache_destroy_context(&ctxt );
return 1;
}
return 0;
}
/* {{{ apc_cache_store */
PHP_APCU_API zend_bool apc_cache_store(apc_cache_t* cache, zend_string *strkey, const zval *val, const int32_t ttl, const zend_bool exclusive) {
apc_cache_entry_t *entry;
apc_cache_key_t key;
time_t t;
apc_context_t ctxt={0,};
zend_bool ret = 0;
t = apc_time();
/* initialize a context suitable for making an insert */
if (apc_cache_make_context(cache, &ctxt, APC_CONTEXT_SHARE, APC_SMALL_POOL, APC_COPY_IN, 0)) {
/* initialize the key for insertion */
if (apc_cache_make_key(&key, strkey)) {
/* run cache defense */
if (!apc_cache_defense(cache, &key)) {
/* initialize the entry for insertion */
if ((entry = apc_cache_make_entry(&ctxt, &key, val, ttl))) {
/* execute an insertion */
if (apc_cache_insert(cache, &key, entry, &ctxt, t, exclusive)) {
ret = 1;
}
}
}
}
/* in any case of failure the context should be destroyed */
if (!ret) {
apc_cache_destroy_context(&ctxt);
}
}
return ret;
} /* }}} */
/* {{{ data_unserialize */
static zval data_unserialize(const char *filename)
{
zval retval;
zend_long len = 0;
zend_stat_t sb;
char *contents, *tmp;
FILE *fp;
php_unserialize_data_t var_hash = {0,};
if(VCWD_STAT(filename, &sb) == -1) {
return EG(uninitialized_zval);
}
fp = fopen(filename, "rb");
len = sizeof(char)*sb.st_size;
tmp = contents = malloc(len);
if(!contents) {
fclose(fp);
return EG(uninitialized_zval);
}
if(fread(contents, 1, len, fp) < 1) {
fclose(fp);
free(contents);
return EG(uninitialized_zval);
}
ZVAL_UNDEF(&retval);
PHP_VAR_UNSERIALIZE_INIT(var_hash);
/* I wish I could use json */
if(!php_var_unserialize(&retval, (const unsigned char**)&tmp, (const unsigned char*)(contents+len), &var_hash)) {
fclose(fp);
zval_dtor(&retval);
return EG(uninitialized_zval);
}
PHP_VAR_UNSERIALIZE_DESTROY(var_hash);
free(contents);
fclose(fp);
return retval;
}
static int apc_load_data(apc_cache_t* cache, const char *data_file)
{
char *p;
char key[MAXPATHLEN] = {0,};
unsigned int key_len;
zval data;
p = strrchr(data_file, DEFAULT_SLASH);
if(p && p[1]) {
strlcpy(key, p+1, sizeof(key));
p = strrchr(key, '.');
if(p) {
p[0] = '\0';
key_len = strlen(key);
data = data_unserialize(data_file);
if(Z_TYPE(data) != IS_UNDEF) {
zend_string *name = zend_string_init(key, key_len, 0);
apc_cache_store(
cache, name, &data, 0, 1);
zend_string_release(name);
zval_dtor(&data);
}
return 1;
}
}
return 0;
}
/* {{{ apc_cache_preload shall load the prepared data files in path into the specified cache */
PHP_APCU_API zend_bool apc_cache_preload(apc_cache_t* cache, const char *path)
{
#ifndef ZTS
zend_bool result = 0;
char file[MAXPATHLEN]={0,};
int ndir, i;
char *p = NULL;
struct dirent **namelist = NULL;
if ((ndir = php_scandir(path, &namelist, 0, php_alphasort)) > 0) {
for (i = 0; i < ndir; i++) {
/* check for extension */
if (!(p = strrchr(namelist[i]->d_name, '.'))
|| (p && strcmp(p, ".data"))) {
free(namelist[i]);
continue;
}
snprintf(file, MAXPATHLEN, "%s%c%s",
path, DEFAULT_SLASH, namelist[i]->d_name);
if(apc_load_data(cache, file)) {
result = 1;
}
free(namelist[i]);
}
free(namelist);
}
return result;
#else
apc_error("Cannot load data from apc.preload_path=%s in thread-safe mode", path);
return 0;
#endif
} /* }}} */
/* {{{ apc_cache_release */
PHP_APCU_API void apc_cache_release(apc_cache_t* cache, apc_cache_entry_t* entry)
{
ATOMIC_DEC(cache, entry->ref_count);
}
/* }}} */
/* {{{ apc_cache_destroy */
PHP_APCU_API void apc_cache_destroy(apc_cache_t* cache)
{
if (!cache) {
return;
}
/* destroy lock */
DESTROY_LOCK(&cache->header->lock);
/* XXX this is definitely a leak, but freeing this causes all the apache
children to freeze. It might be because the segment is shared between
several processes. To figure out is how to free this safely. */
/*apc_sma_free(cache->shmaddr);*/
apc_efree(cache);
}
/* }}} */
/* {{{ apc_cache_real_expunge */
PHP_APCU_API void apc_cache_real_expunge(apc_cache_t* cache) {
/* increment counter */
cache->header->nexpunges++;
/* expunge */
{
zend_ulong i;
for (i = 0; i < cache->nslots; i++) {
apc_cache_slot_t* p = cache->slots[i];
while (p) {
apc_cache_remove_slot(cache, &p);
}
cache->slots[i] = NULL;
}
}
/* set new time so counters make sense */
cache->header->stime = apc_time();
/* reset counters */
cache->header->ninserts = 0;
cache->header->nentries = 0;
cache->header->nhits = 0;
cache->header->nmisses = 0;
/* resets lastkey */
memset(&cache->header->lastkey, 0, sizeof(apc_cache_key_t));
} /* }}} */
/* {{{ apc_cache_clear */
PHP_APCU_API void apc_cache_clear(apc_cache_t* cache)
{
/* check there is a cache and it is not busy */
if(!cache || apc_cache_busy(cache)) {
return;
}
/* lock header */
APC_LOCK(cache->header);
/* set busy */
cache->header->state |= APC_CACHE_ST_BUSY;
/* expunge cache */
apc_cache_real_expunge(cache);
/* set info */
cache->header->stime = apc_time();
cache->header->nexpunges = 0;
/* unset busy */
cache->header->state &= ~APC_CACHE_ST_BUSY;
/* unlock header */
APC_UNLOCK(cache->header);
}
/* }}} */
/* {{{ apc_cache_default_expunge */
PHP_APCU_API void apc_cache_default_expunge(apc_cache_t* cache, size_t size)
{
time_t t;
size_t suitable = 0L;
size_t available = 0L;
t = apc_time();
/* check there is a cache, and it is not busy */
if(!cache || apc_cache_busy(cache)) {
return;
}
/* get the lock for header */
APC_LOCK(cache->header);
/* update state in header */
cache->header->state |= APC_CACHE_ST_BUSY;
/* make suitable selection */
suitable = (cache->smart > 0L) ? (size_t) (cache->smart * size) : (size_t) (cache->sma->size/2);
/* gc */
apc_cache_gc(cache);
/* get available */
available = cache->sma->get_avail_mem();
/* perform expunge processing */
if(!cache->ttl) {
/* check it is necessary to expunge */
if (available < suitable) {
apc_cache_real_expunge(cache);
}
} else {
apc_cache_slot_t **slot;
/* check that expunge is necessary */
if (available < suitable) {
zend_ulong i;
/* look for junk */
for (i = 0; i < cache->nslots; i++) {
slot = &cache->slots[i];
while (*slot) {
/*
* Entry TTL has precedence over cache TTL
*/
if((*slot)->value->ttl) {
if((time_t) ((*slot)->ctime + (*slot)->value->ttl) < t) {
apc_cache_remove_slot(cache, slot);
continue;
}
} else if(cache->ttl) {
if((time_t) ((*slot)->ctime + cache->ttl) < t) {
apc_cache_remove_slot(cache, slot);
continue;
}
}
/* grab next slot */
slot = &(*slot)->next;
}
}
/* if the cache now has space, then reset last key */
if (cache->sma->get_avail_size(size)) {
/* wipe lastkey */
memset(&cache->header->lastkey, 0, sizeof(apc_cache_key_t));
} else {
/* with not enough space left in cache, we are forced to expunge */
apc_cache_real_expunge(cache);
}
}
}
/* we are done */
cache->header->state &= ~APC_CACHE_ST_BUSY;
/* unlock header */
APC_UNLOCK(cache->header);
}
/* }}} */
/* {{{ apc_cache_make_context */
PHP_APCU_API zend_bool apc_cache_make_context(apc_cache_t* cache,
apc_context_t* context,
apc_context_type context_type,
apc_pool_type pool_type,
apc_copy_type copy_type,
uint force_update) {
switch (context_type) {
case APC_CONTEXT_SHARE: {
return apc_cache_make_context_ex(
context,
cache->serializer,
(apc_malloc_t) cache->sma->smalloc,
cache->sma->sfree,
cache->sma->protect,
cache->sma->unprotect,
pool_type, copy_type, force_update
);
} break;
case APC_CONTEXT_NOSHARE: {
return apc_cache_make_context_ex(
context,
cache->serializer,
apc_php_malloc, apc_php_free, NULL, NULL,
pool_type, copy_type, force_update
);
} break;
case APC_CONTEXT_NONE:
/* never used, just to make gcc warning free */
break;
}
return 0;
} /* }}} */
/* {{{ apc_cache_make_context_ex */
PHP_APCU_API zend_bool apc_cache_make_context_ex(apc_context_t* context,
apc_serializer_t* serializer,
apc_malloc_t _malloc,
apc_free_t _free,
apc_protect_t _protect,
apc_unprotect_t _unprotect,
apc_pool_type pool_type,
apc_copy_type copy_type,
uint force_update) {
/* attempt to create the pool */
context->pool = apc_pool_create(
pool_type, _malloc, _free, _protect, _unprotect
);
if (!context->pool) {
apc_warning("Unable to allocate memory for pool.");
return 0;
}
/* set context information */
context->serializer = serializer;
context->copy = copy_type;
context->force_update = force_update;
/* set this to avoid memory errors */
memset(&context->copied, 0, sizeof(HashTable));
return 1;
} /* }}} */
/* {{{ apc_context_destroy */
PHP_APCU_API zend_bool apc_cache_destroy_context(apc_context_t* context) {
if (!context->pool) {
return 0;
}
apc_pool_destroy(context->pool);
return 1;
} /* }}} */
/* {{{ apc_cache_insert */
PHP_APCU_API zend_bool apc_cache_insert(apc_cache_t* cache,
apc_cache_key_t *key,
apc_cache_entry_t* value,
apc_context_t* ctxt,
time_t t,
zend_bool exclusive)
{
zend_bool result = 0;
APC_LOCK(cache->header);
result = apc_cache_insert_internal(
cache, key, value, ctxt, t, exclusive);
APC_UNLOCK(cache->header);
return result;
}
/* }}} */
/* {{{ apc_cache_find */
PHP_APCU_API apc_cache_entry_t* apc_cache_find(apc_cache_t* cache, zend_string *key, time_t t)
{
apc_cache_entry_t *entry = NULL;
/* check we are able to deal with the request */
if(!cache || apc_cache_busy(cache)) {
return entry;
}
entry = apc_cache_find_internal(cache, key, t, 1);
return entry;
}
/* }}} */
/* {{{ apc_cache_fetch */
PHP_APCU_API zend_bool apc_cache_fetch(apc_cache_t* cache, zend_string *key, time_t t, zval **dst)
{
apc_cache_entry_t *entry = NULL;
zend_bool ret = 0;
/* check we are able to deal with the request */
if(!cache || apc_cache_busy(cache)) {
return 0;
}
entry = apc_cache_find_internal(cache, key, t, 1);
if (entry) {
ret = apc_cache_fetch_internal(cache, key, entry, t, dst);
}
return ret;
} /* }}} */
/* {{{ apc_cache_exists */
PHP_APCU_API apc_cache_entry_t* apc_cache_exists(apc_cache_t* cache, zend_string *key, time_t t)
{
if(apc_cache_busy(cache))
{
/* cache cleanup in progress */
return NULL;
}
/* we only declare volatiles we need */
{
apc_cache_slot_t** slot;
volatile apc_cache_entry_t* value = NULL;
zend_ulong h, s;
/* get hash and slot */
apc_cache_hash_slot(cache, key, &h, &s);
/* read lock header */
APC_RLOCK(cache->header);