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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
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* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
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*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
#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 */
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);
/**
* 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);
/**
* 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);
/**
* Free a block of mem, giving it back to the allocator
* @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);
#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);
/** @deprecated @see apr_allocator_owner_set */
APR_DECLARE(void) apr_allocator_set_owner(apr_allocator_t *allocator,
apr_pool_t *pool);
/**
* 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);
/** @deprecated @see apr_allocator_owner_get */
APR_DECLARE(apr_pool_t *) apr_allocator_get_owner(
apr_allocator_t *allocator);
/**
* Set the current threshold at which the allocator should start
* giving blocks back to the system.
* @param allocator The allocator the 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);
/** @deprecated @see apr_allocator_max_free_set */
APR_DECLARE(void) apr_allocator_set_max_free(apr_allocator_t *allocator,
apr_size_t size);
#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);
/** @deprecated @see apr_allocator_mutex_set */
APR_DECLARE(void) apr_allocator_set_mutex(apr_allocator_t *allocator,
apr_thread_mutex_t *mutex);
/**
* 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);
/** @deprecated @see apr_allocator_mutex_get */
APR_DECLARE(apr_thread_mutex_t *) apr_allocator_get_mutex(
apr_allocator_t *allocator);
#endif /* APR_HAS_THREADS */
/** @} */
#ifdef __cplusplus
}
#endif
#endif /* !APR_ALLOCATOR_H */
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