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771b0bd1df
This API only works in very limited circumstances -- relying on it will invariably lead to leaks. The correct way to "free" something from the pool is to use the checkpoint API.
88 lines
2.8 KiB
C
88 lines
2.8 KiB
C
/*
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+----------------------------------------------------------------------+
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| Copyright (c) The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Andrey Hristov <andrey@php.net> |
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| Ulf Wendel <uw@php.net> |
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| Dmitry Stogov <dmitry@php.net> |
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+----------------------------------------------------------------------+
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*/
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#include "php.h"
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#include "mysqlnd.h"
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#include "mysqlnd_block_alloc.h"
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#include "mysqlnd_debug.h"
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#include "mysqlnd_priv.h"
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/* {{{ mysqlnd_mempool_get_chunk */
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static void *
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mysqlnd_mempool_get_chunk(MYSQLND_MEMORY_POOL * pool, size_t size)
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{
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DBG_ENTER("mysqlnd_mempool_get_chunk");
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DBG_RETURN(zend_arena_alloc(&pool->arena, size));
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}
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/* }}} */
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/* {{{ mysqlnd_mempool_create */
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PHPAPI MYSQLND_MEMORY_POOL *
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mysqlnd_mempool_create(size_t arena_size)
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{
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zend_arena * arena;
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MYSQLND_MEMORY_POOL * ret;
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DBG_ENTER("mysqlnd_mempool_create");
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arena = zend_arena_create(MAX(arena_size, ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena))));
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ret = zend_arena_alloc(&arena, sizeof(MYSQLND_MEMORY_POOL));
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ret->arena = arena;
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ret->checkpoint = NULL;
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ret->get_chunk = mysqlnd_mempool_get_chunk;
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DBG_RETURN(ret);
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}
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/* }}} */
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/* {{{ mysqlnd_mempool_destroy */
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PHPAPI void
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mysqlnd_mempool_destroy(MYSQLND_MEMORY_POOL * pool)
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{
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DBG_ENTER("mysqlnd_mempool_destroy");
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/* mnd_free will reference LOCK_access and might crash, depending on the caller...*/
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zend_arena_destroy(pool->arena);
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DBG_VOID_RETURN;
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}
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/* }}} */
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/* {{{ mysqlnd_mempool_save_state */
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PHPAPI void
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mysqlnd_mempool_save_state(MYSQLND_MEMORY_POOL * pool)
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{
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DBG_ENTER("mysqlnd_mempool_save_state");
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pool->checkpoint = zend_arena_checkpoint(pool->arena);
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DBG_VOID_RETURN;
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}
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/* }}} */
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/* {{{ mysqlnd_mempool_restore_state */
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PHPAPI void
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mysqlnd_mempool_restore_state(MYSQLND_MEMORY_POOL * pool)
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{
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DBG_ENTER("mysqlnd_mempool_restore_state");
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#if ZEND_DEBUG
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ZEND_ASSERT(pool->checkpoint);
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#endif
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if (pool->checkpoint) {
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zend_arena_release(&pool->arena, pool->checkpoint);
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pool->checkpoint = NULL;
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}
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DBG_VOID_RETURN;
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}
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/* }}} */
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