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/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
* applicable.
*
* Licensed 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.
*/
#include "apr.h"
#include "apr_strings.h"
#include "apr_arch_global_mutex.h"
#include "apr_proc_mutex.h"
#include "apr_thread_mutex.h"
#include "apr_portable.h"
static apr_status_t global_mutex_cleanup(void *data)
{
apr_global_mutex_t *m = (apr_global_mutex_t *)data;
apr_status_t rv;
rv = apr_proc_mutex_destroy(m->proc_mutex);
#if APR_HAS_THREADS
if (m->thread_mutex) {
if (rv != APR_SUCCESS) {
(void)apr_thread_mutex_destroy(m->thread_mutex);
}
else {
rv = apr_thread_mutex_destroy(m->thread_mutex);
}
}
#endif /* APR_HAS_THREADS */
return rv;
}
APR_DECLARE(apr_status_t) apr_global_mutex_create(apr_global_mutex_t **mutex,
const char *fname,
apr_lockmech_e mech,
apr_pool_t *pool)
{
apr_status_t rv;
apr_global_mutex_t *m;
m = (apr_global_mutex_t *)apr_palloc(pool, sizeof(*m));
m->pool = pool;
rv = apr_proc_mutex_create(&m->proc_mutex, fname, mech, m->pool);
if (rv != APR_SUCCESS) {
return rv;
}
#if APR_HAS_THREADS
if (m->proc_mutex->inter_meth->flags & APR_PROCESS_LOCK_MECH_IS_GLOBAL) {
m->thread_mutex = NULL; /* We don't need a thread lock. */
}
else {
rv = apr_thread_mutex_create(&m->thread_mutex,
APR_THREAD_MUTEX_DEFAULT, m->pool);
if (rv != APR_SUCCESS) {
rv = apr_proc_mutex_destroy(m->proc_mutex);
return rv;
}
}
#endif /* APR_HAS_THREADS */
apr_pool_cleanup_register(m->pool, (void *)m,
global_mutex_cleanup, apr_pool_cleanup_null);
*mutex = m;
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_global_mutex_child_init(
apr_global_mutex_t **mutex,
const char *fname,
apr_pool_t *pool)
{
apr_status_t rv;
rv = apr_proc_mutex_child_init(&((*mutex)->proc_mutex), fname, pool);
return rv;
}
APR_DECLARE(apr_status_t) apr_global_mutex_lock(apr_global_mutex_t *mutex)
{
apr_status_t rv;
#if APR_HAS_THREADS
if (mutex->thread_mutex) {
rv = apr_thread_mutex_lock(mutex->thread_mutex);
if (rv != APR_SUCCESS) {
return rv;
}
}
#endif /* APR_HAS_THREADS */
rv = apr_proc_mutex_lock(mutex->proc_mutex);
#if APR_HAS_THREADS
if (rv != APR_SUCCESS) {
if (mutex->thread_mutex) {
(void)apr_thread_mutex_unlock(mutex->thread_mutex);
}
}
#endif /* APR_HAS_THREADS */
return rv;
}
APR_DECLARE(apr_status_t) apr_global_mutex_trylock(apr_global_mutex_t *mutex)
{
apr_status_t rv;
#if APR_HAS_THREADS
if (mutex->thread_mutex) {
rv = apr_thread_mutex_trylock(mutex->thread_mutex);
if (rv != APR_SUCCESS) {
return rv;
}
}
#endif /* APR_HAS_THREADS */
rv = apr_proc_mutex_trylock(mutex->proc_mutex);
#if APR_HAS_THREADS
if (rv != APR_SUCCESS) {
if (mutex->thread_mutex) {
(void)apr_thread_mutex_unlock(mutex->thread_mutex);
}
}
#endif /* APR_HAS_THREADS */
return rv;
}
APR_DECLARE(apr_status_t) apr_global_mutex_unlock(apr_global_mutex_t *mutex)
{
apr_status_t rv;
rv = apr_proc_mutex_unlock(mutex->proc_mutex);
#if APR_HAS_THREADS
if (mutex->thread_mutex) {
if (rv != APR_SUCCESS) {
(void)apr_thread_mutex_unlock(mutex->thread_mutex);
}
else {
rv = apr_thread_mutex_unlock(mutex->thread_mutex);
}
}
#endif /* APR_HAS_THREADS */
return rv;
}
APR_DECLARE(apr_status_t) apr_os_global_mutex_get(apr_os_global_mutex_t *ospmutex,
apr_global_mutex_t *pmutex)
{
ospmutex->pool = pmutex->pool;
ospmutex->proc_mutex = pmutex->proc_mutex;
#if APR_HAS_THREADS
ospmutex->thread_mutex = pmutex->thread_mutex;
#endif
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_global_mutex_destroy(apr_global_mutex_t *mutex)
{
return apr_pool_cleanup_run(mutex->pool, mutex, global_mutex_cleanup);
}
APR_POOL_IMPLEMENT_ACCESSOR(global_mutex)
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