1 /* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
22 * @brief APR-UTIL Resource List Routines
27 #include "apr_pools.h"
28 #include "apr_errno.h"
34 * @defgroup APR_Util_RL Resource List Routines
41 #endif /* __cplusplus */
43 /** Opaque resource list object */
44 typedef struct apr_reslist_t apr_reslist_t;
46 /* Generic constructor called by resource list when it needs to create a
48 * @param resource opaque resource
52 typedef apr_status_t (*apr_reslist_constructor)(void **resource, void *params,
55 /* Generic destructor called by resource list when it needs to destroy a
57 * @param resource opaque resource
61 typedef apr_status_t (*apr_reslist_destructor)(void *resource, void *params,
65 * Create a new resource list with the following parameters:
66 * @param reslist An address where the pointer to the new resource
67 * list will be stored.
68 * @param pool The pool to use for local storage and management
69 * @param min Allowed minimum number of available resources. Zero
70 * creates new resources only when needed.
71 * @param smax Resources will be destroyed to meet this maximum
72 * restriction as they expire.
73 * @param hmax Absolute maximum limit on the number of total resources.
74 * @param ttl If non-zero, sets the maximum amount of time a resource
75 * may be available while exceeding the soft limit.
76 * @param con Constructor routine that is called to create a new resource.
77 * @param de Destructor routine that is called to destroy an expired resource.
78 * @param params Passed to constructor and deconstructor
79 * @param pool The pool from which to create this resoure list. Also the
80 * same pool that is passed to the constructor and destructor
83 APU_DECLARE(apr_status_t) apr_reslist_create(apr_reslist_t **reslist,
84 int min, int smax, int hmax,
85 apr_interval_time_t ttl,
86 apr_reslist_constructor con,
87 apr_reslist_destructor de,
92 * Destroy the given resource list and all resources controlled by
94 * FIXME: Should this block until all resources become available,
95 * or maybe just destroy all the free ones, or maybe destroy
96 * them even though they might be in use by something else?
97 * @param reslist The reslist to destroy
99 APU_DECLARE(apr_status_t) apr_reslist_destroy(apr_reslist_t *reslist);
102 * Retrieve a resource from the list, creating a new one if necessary.
103 * If we have met our maximum number of resources, we will block
104 * until one becomes available.
106 APU_DECLARE(apr_status_t) apr_reslist_acquire(apr_reslist_t *reslist,
110 * Return a resource back to the list of available resources.
112 APU_DECLARE(apr_status_t) apr_reslist_release(apr_reslist_t *reslist,
116 * Set the timeout the acquire will wait for a free resource
117 * when the maximum number of resources is exceeded.
118 * @param reslist The resource list.
119 * @param timeout Timeout to wait. The zero waits forewer.
121 APU_DECLARE(void) apr_reslist_timeout_set(apr_reslist_t *reslist,
122 apr_interval_time_t timeout);
125 * Invalidate a resource in the pool - e.g. a database connection
126 * that returns a "lost connection" error and can't be restored.
127 * Use this instead of apr_reslist_release if the resource is bad.
129 APU_DECLARE(apr_status_t) apr_reslist_invalidate(apr_reslist_t *reslist,
139 #endif /* APR_HAS_THREADS */
141 #endif /* ! APR_RESLIST_H */