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/* 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_RMM_H
#define APR_RMM_H
/**
* @file apr_rmm.h
* @brief APR-UTIL Relocatable Memory Management Routines
*/
/**
* @defgroup APR_Util_RMM Relocatable Memory Management Routines
* @ingroup APR_Util
* @{
*/
#include "apr.h"
#include "apr_pools.h"
#include "apr_errno.h"
#include "apu.h"
#include "apr_anylock.h"
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/** Structure to access Relocatable, Managed Memory */
typedef struct apr_rmm_t apr_rmm_t;
/** Fundamental allocation unit, within a specific apr_rmm_t */
typedef apr_size_t apr_rmm_off_t;
/**
* Initialize a relocatable memory block to be managed by the apr_rmm API.
* @param rmm The relocatable memory block
* @param lock An apr_anylock_t of the appropriate type of lock, or NULL
* if no locking is required.
* @param membuf The block of relocatable memory to be managed
* @param memsize The size of relocatable memory block to be managed
* @param cont The pool to use for local storage and management
* @remark Both @param membuf and @param memsize must be aligned
* (for instance using APR_ALIGN_DEFAULT).
*/
APU_DECLARE(apr_status_t) apr_rmm_init(apr_rmm_t **rmm, apr_anylock_t *lock,
void *membuf, apr_size_t memsize,
apr_pool_t *cont);
/**
* Destroy a managed memory block.
* @param rmm The relocatable memory block to destroy
*/
APU_DECLARE(apr_status_t) apr_rmm_destroy(apr_rmm_t *rmm);
/**
* Attach to a relocatable memory block already managed by the apr_rmm API.
* @param rmm The relocatable memory block
* @param lock An apr_anylock_t of the appropriate type of lock
* @param membuf The block of relocatable memory already under management
* @param cont The pool to use for local storage and management
*/
APU_DECLARE(apr_status_t) apr_rmm_attach(apr_rmm_t **rmm, apr_anylock_t *lock,
void *membuf, apr_pool_t *cont);
/**
* Detach from the managed block of memory.
* @param rmm The relocatable memory block to detach from
*/
APU_DECLARE(apr_status_t) apr_rmm_detach(apr_rmm_t *rmm);
/**
* Allocate memory from the block of relocatable memory.
* @param rmm The relocatable memory block
* @param reqsize How much memory to allocate
*/
APU_DECLARE(apr_rmm_off_t) apr_rmm_malloc(apr_rmm_t *rmm, apr_size_t reqsize);
/**
* Realloc memory from the block of relocatable memory.
* @param rmm The relocatable memory block
* @param entity The memory allocation to realloc
* @param reqsize The new size
*/
APU_DECLARE(apr_rmm_off_t) apr_rmm_realloc(apr_rmm_t *rmm, void *entity, apr_size_t reqsize);
/**
* Allocate memory from the block of relocatable memory and initialize it to zero.
* @param rmm The relocatable memory block
* @param reqsize How much memory to allocate
*/
APU_DECLARE(apr_rmm_off_t) apr_rmm_calloc(apr_rmm_t *rmm, apr_size_t reqsize);
/**
* Free allocation returned by apr_rmm_malloc or apr_rmm_calloc.
* @param rmm The relocatable memory block
* @param entity The memory allocation to free
*/
APU_DECLARE(apr_status_t) apr_rmm_free(apr_rmm_t *rmm, apr_rmm_off_t entity);
/**
* Retrieve the physical address of a relocatable allocation of memory
* @param rmm The relocatable memory block
* @param entity The memory allocation to free
* @return address The address, aligned with APR_ALIGN_DEFAULT.
*/
APU_DECLARE(void *) apr_rmm_addr_get(apr_rmm_t *rmm, apr_rmm_off_t entity);
/**
* Compute the offset of a relocatable allocation of memory
* @param rmm The relocatable memory block
* @param entity The physical address to convert to an offset
*/
APU_DECLARE(apr_rmm_off_t) apr_rmm_offset_get(apr_rmm_t *rmm, void *entity);
/**
* Compute the required overallocation of memory needed to fit n allocs
* @param n The number of alloc/calloc regions desired
*/
APU_DECLARE(apr_size_t) apr_rmm_overhead_get(int n);
#ifdef __cplusplus
}
#endif
/** @} */
#endif /* ! APR_RMM_H */
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