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
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
17 #include "apr.h"
18 #include "apr_strings.h"
19 #include "apr_arch_global_mutex.h"
20 #include "apr_proc_mutex.h"
21 #include "apr_thread_mutex.h"
22 #include "apr_portable.h"
23
global_mutex_cleanup(void * data)24 static apr_status_t global_mutex_cleanup(void *data)
25 {
26 apr_global_mutex_t *m = (apr_global_mutex_t *)data;
27 apr_status_t rv;
28
29 rv = apr_proc_mutex_destroy(m->proc_mutex);
30
31 #if APR_HAS_THREADS
32 if (m->thread_mutex) {
33 if (rv != APR_SUCCESS) {
34 (void)apr_thread_mutex_destroy(m->thread_mutex);
35 }
36 else {
37 rv = apr_thread_mutex_destroy(m->thread_mutex);
38 }
39 }
40 #endif /* APR_HAS_THREADS */
41
42 return rv;
43 }
44
apr_global_mutex_create(apr_global_mutex_t ** mutex,const char * fname,apr_lockmech_e mech,apr_pool_t * pool)45 APR_DECLARE(apr_status_t) apr_global_mutex_create(apr_global_mutex_t **mutex,
46 const char *fname,
47 apr_lockmech_e mech,
48 apr_pool_t *pool)
49 {
50 apr_status_t rv;
51 apr_global_mutex_t *m;
52
53 m = (apr_global_mutex_t *)apr_palloc(pool, sizeof(*m));
54 m->pool = pool;
55
56 rv = apr_proc_mutex_create(&m->proc_mutex, fname, mech, m->pool);
57 if (rv != APR_SUCCESS) {
58 return rv;
59 }
60
61 #if APR_HAS_THREADS
62 if (m->proc_mutex->inter_meth->flags & APR_PROCESS_LOCK_MECH_IS_GLOBAL) {
63 m->thread_mutex = NULL; /* We don't need a thread lock. */
64 }
65 else {
66 rv = apr_thread_mutex_create(&m->thread_mutex,
67 APR_THREAD_MUTEX_DEFAULT, m->pool);
68 if (rv != APR_SUCCESS) {
69 rv = apr_proc_mutex_destroy(m->proc_mutex);
70 return rv;
71 }
72 }
73 #endif /* APR_HAS_THREADS */
74
75 apr_pool_cleanup_register(m->pool, (void *)m,
76 global_mutex_cleanup, apr_pool_cleanup_null);
77 *mutex = m;
78 return APR_SUCCESS;
79 }
80
apr_global_mutex_child_init(apr_global_mutex_t ** mutex,const char * fname,apr_pool_t * pool)81 APR_DECLARE(apr_status_t) apr_global_mutex_child_init(
82 apr_global_mutex_t **mutex,
83 const char *fname,
84 apr_pool_t *pool)
85 {
86 apr_status_t rv;
87
88 rv = apr_proc_mutex_child_init(&((*mutex)->proc_mutex), fname, pool);
89 return rv;
90 }
91
apr_global_mutex_lock(apr_global_mutex_t * mutex)92 APR_DECLARE(apr_status_t) apr_global_mutex_lock(apr_global_mutex_t *mutex)
93 {
94 apr_status_t rv;
95
96 #if APR_HAS_THREADS
97 if (mutex->thread_mutex) {
98 rv = apr_thread_mutex_lock(mutex->thread_mutex);
99 if (rv != APR_SUCCESS) {
100 return rv;
101 }
102 }
103 #endif /* APR_HAS_THREADS */
104
105 rv = apr_proc_mutex_lock(mutex->proc_mutex);
106
107 #if APR_HAS_THREADS
108 if (rv != APR_SUCCESS) {
109 if (mutex->thread_mutex) {
110 (void)apr_thread_mutex_unlock(mutex->thread_mutex);
111 }
112 }
113 #endif /* APR_HAS_THREADS */
114
115 return rv;
116 }
117
apr_global_mutex_trylock(apr_global_mutex_t * mutex)118 APR_DECLARE(apr_status_t) apr_global_mutex_trylock(apr_global_mutex_t *mutex)
119 {
120 apr_status_t rv;
121
122 #if APR_HAS_THREADS
123 if (mutex->thread_mutex) {
124 rv = apr_thread_mutex_trylock(mutex->thread_mutex);
125 if (rv != APR_SUCCESS) {
126 return rv;
127 }
128 }
129 #endif /* APR_HAS_THREADS */
130
131 rv = apr_proc_mutex_trylock(mutex->proc_mutex);
132
133 #if APR_HAS_THREADS
134 if (rv != APR_SUCCESS) {
135 if (mutex->thread_mutex) {
136 (void)apr_thread_mutex_unlock(mutex->thread_mutex);
137 }
138 }
139 #endif /* APR_HAS_THREADS */
140
141 return rv;
142 }
143
apr_global_mutex_unlock(apr_global_mutex_t * mutex)144 APR_DECLARE(apr_status_t) apr_global_mutex_unlock(apr_global_mutex_t *mutex)
145 {
146 apr_status_t rv;
147
148 rv = apr_proc_mutex_unlock(mutex->proc_mutex);
149 #if APR_HAS_THREADS
150 if (mutex->thread_mutex) {
151 if (rv != APR_SUCCESS) {
152 (void)apr_thread_mutex_unlock(mutex->thread_mutex);
153 }
154 else {
155 rv = apr_thread_mutex_unlock(mutex->thread_mutex);
156 }
157 }
158 #endif /* APR_HAS_THREADS */
159 return rv;
160 }
161
apr_os_global_mutex_get(apr_os_global_mutex_t * ospmutex,apr_global_mutex_t * pmutex)162 APR_DECLARE(apr_status_t) apr_os_global_mutex_get(apr_os_global_mutex_t *ospmutex,
163 apr_global_mutex_t *pmutex)
164 {
165 ospmutex->pool = pmutex->pool;
166 ospmutex->proc_mutex = pmutex->proc_mutex;
167 #if APR_HAS_THREADS
168 ospmutex->thread_mutex = pmutex->thread_mutex;
169 #endif
170 return APR_SUCCESS;
171 }
172
apr_global_mutex_destroy(apr_global_mutex_t * mutex)173 APR_DECLARE(apr_status_t) apr_global_mutex_destroy(apr_global_mutex_t *mutex)
174 {
175 return apr_pool_cleanup_run(mutex->pool, mutex, global_mutex_cleanup);
176 }
177
apr_global_mutex_lockfile(apr_global_mutex_t * mutex)178 APR_DECLARE(const char *) apr_global_mutex_lockfile(apr_global_mutex_t *mutex)
179 {
180 return apr_proc_mutex_lockfile(mutex->proc_mutex);
181 }
182
apr_global_mutex_name(apr_global_mutex_t * mutex)183 APR_DECLARE(const char *) apr_global_mutex_name(apr_global_mutex_t *mutex)
184 {
185 return apr_proc_mutex_name(mutex->proc_mutex);
186 }
187
188 APR_POOL_IMPLEMENT_ACCESSOR(global_mutex)
189