mirror of https://gitee.com/openkylin/apr.git
180 lines
6.1 KiB
C
180 lines
6.1 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership.
|
|
* The ASF licenses this file to You under the Apache License, Version 2.0
|
|
* (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef APR_ALLOCATOR_H
|
|
#define APR_ALLOCATOR_H
|
|
|
|
/**
|
|
* @file apr_allocator.h
|
|
* @brief APR Internal Memory Allocation
|
|
*/
|
|
|
|
#include "apr.h"
|
|
#include "apr_errno.h"
|
|
#define APR_WANT_MEMFUNC /**< For no good reason? */
|
|
#include "apr_want.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* @defgroup apr_allocator Internal Memory Allocation
|
|
* @ingroup APR
|
|
* @{
|
|
*/
|
|
|
|
/** the allocator structure */
|
|
typedef struct apr_allocator_t apr_allocator_t;
|
|
/** the structure which holds information about the allocation */
|
|
typedef struct apr_memnode_t apr_memnode_t;
|
|
|
|
/** basic memory node structure
|
|
* @note The next, ref and first_avail fields are available for use by the
|
|
* caller of apr_allocator_alloc(), the remaining fields are read-only.
|
|
* The next field has to be used with caution and sensibly set when the
|
|
* memnode is passed back to apr_allocator_free(). See apr_allocator_free()
|
|
* for details.
|
|
* The ref and first_avail fields will be properly restored by
|
|
* apr_allocator_free().
|
|
*/
|
|
struct apr_memnode_t {
|
|
apr_memnode_t *next; /**< next memnode */
|
|
apr_memnode_t **ref; /**< reference to self */
|
|
apr_uint32_t index; /**< size */
|
|
apr_uint32_t free_index; /**< how much free */
|
|
char *first_avail; /**< pointer to first free memory */
|
|
char *endp; /**< pointer to end of free memory */
|
|
};
|
|
|
|
/** The base size of a memory node - aligned. */
|
|
#define APR_MEMNODE_T_SIZE APR_ALIGN_DEFAULT(sizeof(apr_memnode_t))
|
|
|
|
/** Symbolic constants */
|
|
#define APR_ALLOCATOR_MAX_FREE_UNLIMITED 0
|
|
|
|
/**
|
|
* Create a new allocator
|
|
* @param allocator The allocator we have just created.
|
|
*
|
|
*/
|
|
APR_DECLARE(apr_status_t) apr_allocator_create(apr_allocator_t **allocator)
|
|
__attribute__((nonnull(1)));
|
|
|
|
/**
|
|
* Destroy an allocator
|
|
* @param allocator The allocator to be destroyed
|
|
* @remark Any memnodes not given back to the allocator prior to destroying
|
|
* will _not_ be free()d.
|
|
*/
|
|
APR_DECLARE(void) apr_allocator_destroy(apr_allocator_t *allocator)
|
|
__attribute__((nonnull(1)));
|
|
|
|
/**
|
|
* Allocate a block of mem from the allocator
|
|
* @param allocator The allocator to allocate from
|
|
* @param size The size of the mem to allocate (excluding the
|
|
* memnode structure)
|
|
*/
|
|
APR_DECLARE(apr_memnode_t *) apr_allocator_alloc(apr_allocator_t *allocator,
|
|
apr_size_t size)
|
|
__attribute__((nonnull(1)));
|
|
|
|
/**
|
|
* Free a list of blocks of mem, giving them back to the allocator.
|
|
* The list is typically terminated by a memnode with its next field
|
|
* set to NULL.
|
|
* @param allocator The allocator to give the mem back to
|
|
* @param memnode The memory node to return
|
|
*/
|
|
APR_DECLARE(void) apr_allocator_free(apr_allocator_t *allocator,
|
|
apr_memnode_t *memnode)
|
|
__attribute__((nonnull(1,2)));
|
|
|
|
/**
|
|
* Get the true size that would be allocated for the given size (including
|
|
* the header and alignment).
|
|
* @param allocator The allocator from which to the memory would be allocated
|
|
* @param size The size to align
|
|
* @return The aligned size (or zero on apr_size_t overflow)
|
|
*/
|
|
APR_DECLARE(apr_size_t) apr_allocator_align(apr_allocator_t *allocator,
|
|
apr_size_t size);
|
|
|
|
#include "apr_pools.h"
|
|
|
|
/**
|
|
* Set the owner of the allocator
|
|
* @param allocator The allocator to set the owner for
|
|
* @param pool The pool that is to own the allocator
|
|
* @remark Typically pool is the highest level pool using the allocator
|
|
*/
|
|
/*
|
|
* XXX: see if we can come up with something a bit better. Currently
|
|
* you can make a pool an owner, but if the pool doesn't use the allocator
|
|
* the allocator will never be destroyed.
|
|
*/
|
|
APR_DECLARE(void) apr_allocator_owner_set(apr_allocator_t *allocator,
|
|
apr_pool_t *pool)
|
|
__attribute__((nonnull(1)));
|
|
|
|
/**
|
|
* Get the current owner of the allocator
|
|
* @param allocator The allocator to get the owner from
|
|
*/
|
|
APR_DECLARE(apr_pool_t *) apr_allocator_owner_get(apr_allocator_t *allocator)
|
|
__attribute__((nonnull(1)));
|
|
|
|
/**
|
|
* Set the current threshold at which the allocator should start
|
|
* giving blocks back to the system.
|
|
* @param allocator The allocator to set the threshold on
|
|
* @param size The threshold. 0 == unlimited.
|
|
*/
|
|
APR_DECLARE(void) apr_allocator_max_free_set(apr_allocator_t *allocator,
|
|
apr_size_t size)
|
|
__attribute__((nonnull(1)));
|
|
|
|
#include "apr_thread_mutex.h"
|
|
|
|
#if APR_HAS_THREADS
|
|
/**
|
|
* Set a mutex for the allocator to use
|
|
* @param allocator The allocator to set the mutex for
|
|
* @param mutex The mutex
|
|
*/
|
|
APR_DECLARE(void) apr_allocator_mutex_set(apr_allocator_t *allocator,
|
|
apr_thread_mutex_t *mutex)
|
|
__attribute__((nonnull(1)));
|
|
|
|
/**
|
|
* Get the mutex currently set for the allocator
|
|
* @param allocator The allocator
|
|
*/
|
|
APR_DECLARE(apr_thread_mutex_t *) apr_allocator_mutex_get(
|
|
apr_allocator_t *allocator)
|
|
__attribute__((nonnull(1)));
|
|
|
|
#endif /* APR_HAS_THREADS */
|
|
|
|
/** @} */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* !APR_ALLOCATOR_H */
|