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 24static 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 45APR_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 81APR_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 92APR_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 118APR_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 144APR_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 162APR_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 173APR_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 178APR_DECLARE(const char *) apr_global_mutex_lockfile(apr_global_mutex_t *mutex) 179{ 180 return apr_proc_mutex_lockfile(mutex->proc_mutex); 181} 182 183APR_DECLARE(const char *) apr_global_mutex_name(apr_global_mutex_t *mutex) 184{ 185 return apr_proc_mutex_name(mutex->proc_mutex); 186} 187 188APR_POOL_IMPLEMENT_ACCESSOR(global_mutex) 189