diff options
Diffstat (limited to 'locks/unix/global_mutex.c')
| -rw-r--r-- | locks/unix/global_mutex.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/locks/unix/global_mutex.c b/locks/unix/global_mutex.c new file mode 100644 index 0000000..0217351 --- /dev/null +++ b/locks/unix/global_mutex.c @@ -0,0 +1,245 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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->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_timedlock(apr_global_mutex_t *mutex, + apr_interval_time_t timeout) +{ +#if APR_HAS_TIMEDLOCKS + apr_status_t rv; + +#if APR_HAS_THREADS + if (mutex->thread_mutex) { + apr_time_t expiry = 0; + if (timeout > 0) { + expiry = apr_time_now() + timeout; + } + rv = apr_thread_mutex_timedlock(mutex->thread_mutex, timeout); + if (rv != APR_SUCCESS) { + return rv; + } + if (expiry) { + timeout = expiry - apr_time_now(); + if (timeout < 0) { + timeout = 0; + } + } + } +#endif /* APR_HAS_THREADS */ + + rv = apr_proc_mutex_timedlock(mutex->proc_mutex, timeout); + +#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; +#else /* APR_HAS_TIMEDLOCKS */ + return APR_ENOTIMPL; +#endif +} + +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_DECLARE(const char *) apr_global_mutex_lockfile(apr_global_mutex_t *mutex) +{ + return apr_proc_mutex_lockfile(mutex->proc_mutex); +} + +APR_DECLARE(apr_lockmech_e) apr_global_mutex_mech(apr_global_mutex_t *mutex) +{ + return apr_proc_mutex_mech(mutex->proc_mutex); +} + +APR_DECLARE(const char *) apr_global_mutex_name(apr_global_mutex_t *mutex) +{ + return apr_proc_mutex_name(mutex->proc_mutex); +} + +APR_PERMS_SET_IMPLEMENT(global_mutex) +{ + apr_status_t rv; + apr_global_mutex_t *mutex = (apr_global_mutex_t *)theglobal_mutex; + + rv = APR_PERMS_SET_FN(proc_mutex)(mutex->proc_mutex, perms, uid, gid); + return rv; +} + +APR_POOL_IMPLEMENT_ACCESSOR(global_mutex) + |