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apr_allocator.h
/* 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 */
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