1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. 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.
17 /*Read/Write locking implementation based on the MultiLock code from
18 * Stephen Beaulieu <hippo@be.com>
21 #include "beos/apr_arch_proc_mutex.h"
22 #include "apr_strings.h"
23 #include "apr_portable.h"
25 static apr_status_t _proc_mutex_cleanup(void * data)
27 apr_proc_mutex_t *lock = (apr_proc_mutex_t*)data;
28 if (lock->LockCount != 0) {
29 /* we're still locked... */
30 while (atomic_add(&lock->LockCount , -1) > 1){
31 /* OK we had more than one person waiting on the lock so
32 * the sem is also locked. Release it until we have no more
35 release_sem (lock->Lock);
38 delete_sem(lock->Lock);
42 APR_DECLARE(apr_status_t) apr_proc_mutex_create(apr_proc_mutex_t **mutex,
47 apr_proc_mutex_t *new;
48 apr_status_t stat = APR_SUCCESS;
50 if (mech != APR_LOCK_DEFAULT) {
54 new = (apr_proc_mutex_t *)apr_pcalloc(pool, sizeof(apr_proc_mutex_t));
59 if ((stat = create_sem(0, "APR_Lock")) < B_NO_ERROR) {
60 _proc_mutex_cleanup(new);
67 apr_pool_cleanup_register(new->pool, (void *)new, _proc_mutex_cleanup,
68 apr_pool_cleanup_null);
74 APR_DECLARE(apr_status_t) apr_proc_mutex_child_init(apr_proc_mutex_t **mutex,
81 APR_DECLARE(apr_status_t) apr_proc_mutex_lock(apr_proc_mutex_t *mutex)
85 if (atomic_add(&mutex->LockCount, 1) > 0) {
86 if ((stat = acquire_sem(mutex->Lock)) < B_NO_ERROR) {
87 atomic_add(&mutex->LockCount, -1);
94 APR_DECLARE(apr_status_t) apr_proc_mutex_trylock(apr_proc_mutex_t *mutex)
99 APR_DECLARE(apr_status_t) apr_proc_mutex_unlock(apr_proc_mutex_t *mutex)
103 if (atomic_add(&mutex->LockCount, -1) > 1) {
104 if ((stat = release_sem(mutex->Lock)) < B_NO_ERROR) {
105 atomic_add(&mutex->LockCount, 1);
112 APR_DECLARE(apr_status_t) apr_proc_mutex_destroy(apr_proc_mutex_t *mutex)
115 if ((stat = _proc_mutex_cleanup(mutex)) == APR_SUCCESS) {
116 apr_pool_cleanup_kill(mutex->pool, mutex, _proc_mutex_cleanup);
122 APR_DECLARE(apr_status_t) apr_proc_mutex_cleanup(void *mutex)
124 return _proc_mutex_cleanup(mutex);
127 APR_DECLARE(const char *) apr_proc_mutex_lockfile(apr_proc_mutex_t *mutex)
132 APR_DECLARE(const char *) apr_proc_mutex_name(apr_proc_mutex_t *mutex)
137 APR_DECLARE(const char *) apr_proc_mutex_defname(void)
142 APR_POOL_IMPLEMENT_ACCESSOR(proc_mutex)
144 /* Implement OS-specific accessors defined in apr_portable.h */
146 APR_DECLARE(apr_status_t) apr_os_proc_mutex_get(apr_os_proc_mutex_t *ospmutex,
147 apr_proc_mutex_t *pmutex)
149 ospmutex->sem = pmutex->Lock;
150 ospmutex->ben = pmutex->LockCount;
154 APR_DECLARE(apr_status_t) apr_os_proc_mutex_put(apr_proc_mutex_t **pmutex,
155 apr_os_proc_mutex_t *ospmutex,
161 if ((*pmutex) == NULL) {
162 (*pmutex) = (apr_proc_mutex_t *)apr_pcalloc(pool, sizeof(apr_proc_mutex_t));
163 (*pmutex)->pool = pool;
165 (*pmutex)->Lock = ospmutex->sem;
166 (*pmutex)->LockCount = ospmutex->ben;