add apr to in tree libs

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3733 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/apr/include/apr_allocator.h

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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_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);
+
+/**
+ * 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 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);
+
+#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);
+
+/**
+ * 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);
+
+/**
+ * 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);
+
+#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);
+
+/**
+ * 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);
+
+#endif /* APR_HAS_THREADS */
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !APR_ALLOCATOR_H */