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/* Copyright 2000-2004 The Apache Software Foundation
*
* 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_arch_thread_rwlock.h"
#include "apr_private.h"
#if APR_HAS_THREADS
#ifdef HAVE_PTHREAD_RWLOCKS
/* The rwlock must be initialized but not locked by any thread when
* cleanup is called. */
static apr_status_t thread_rwlock_cleanup(void *data)
{
apr_thread_rwlock_t *rwlock = (apr_thread_rwlock_t *)data;
apr_status_t stat;
stat = pthread_rwlock_destroy(&rwlock->rwlock);
#ifdef PTHREAD_SETS_ERRNO
if (stat) {
stat = errno;
}
#endif
return stat;
}
APR_DECLARE(apr_status_t) apr_thread_rwlock_create(apr_thread_rwlock_t **rwlock,
apr_pool_t *pool)
{
apr_thread_rwlock_t *new_rwlock;
apr_status_t stat;
new_rwlock = apr_palloc(pool, sizeof(apr_thread_rwlock_t));
new_rwlock->pool = pool;
if ((stat = pthread_rwlock_init(&new_rwlock->rwlock, NULL))) {
#ifdef PTHREAD_SETS_ERRNO
stat = errno;
#endif
return stat;
}
apr_pool_cleanup_register(new_rwlock->pool,
(void *)new_rwlock, thread_rwlock_cleanup,
apr_pool_cleanup_null);
*rwlock = new_rwlock;
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_thread_rwlock_rdlock(apr_thread_rwlock_t *rwlock)
{
apr_status_t stat;
stat = pthread_rwlock_rdlock(&rwlock->rwlock);
#ifdef PTHREAD_SETS_ERRNO
if (stat) {
stat = errno;
}
#endif
return stat;
}
APR_DECLARE(apr_status_t) apr_thread_rwlock_tryrdlock(apr_thread_rwlock_t *rwlock)
{
apr_status_t stat;
stat = pthread_rwlock_tryrdlock(&rwlock->rwlock);
#ifdef PTHREAD_SETS_ERRNO
if (stat) {
stat = errno;
}
#endif
/* Normalize the return code. */
if (stat == EBUSY)
stat = APR_EBUSY;
return stat;
}
APR_DECLARE(apr_status_t) apr_thread_rwlock_wrlock(apr_thread_rwlock_t *rwlock)
{
apr_status_t stat;
stat = pthread_rwlock_wrlock(&rwlock->rwlock);
#ifdef PTHREAD_SETS_ERRNO
if (stat) {
stat = errno;
}
#endif
return stat;
}
APR_DECLARE(apr_status_t) apr_thread_rwlock_trywrlock(apr_thread_rwlock_t *rwlock)
{
apr_status_t stat;
stat = pthread_rwlock_trywrlock(&rwlock->rwlock);
#ifdef PTHREAD_SETS_ERRNO
if (stat) {
stat = errno;
}
#endif
/* Normalize the return code. */
if (stat == EBUSY)
stat = APR_EBUSY;
return stat;
}
APR_DECLARE(apr_status_t) apr_thread_rwlock_unlock(apr_thread_rwlock_t *rwlock)
{
apr_status_t stat;
stat = pthread_rwlock_unlock(&rwlock->rwlock);
#ifdef PTHREAD_SETS_ERRNO
if (stat) {
stat = errno;
}
#endif
return stat;
}
APR_DECLARE(apr_status_t) apr_thread_rwlock_destroy(apr_thread_rwlock_t *rwlock)
{
return apr_pool_cleanup_run(rwlock->pool, rwlock, thread_rwlock_cleanup);
}
#else /* HAVE_PTHREAD_RWLOCKS */
APR_DECLARE(apr_status_t) apr_thread_rwlock_create(apr_thread_rwlock_t **rwlock,
apr_pool_t *pool)
{
return APR_ENOTIMPL;
}
APR_DECLARE(apr_status_t) apr_thread_rwlock_rdlock(apr_thread_rwlock_t *rwlock)
{
return APR_ENOTIMPL;
}
APR_DECLARE(apr_status_t) apr_thread_rwlock_tryrdlock(apr_thread_rwlock_t *rwlock)
{
return APR_ENOTIMPL;
}
APR_DECLARE(apr_status_t) apr_thread_rwlock_wrlock(apr_thread_rwlock_t *rwlock)
{
return APR_ENOTIMPL;
}
APR_DECLARE(apr_status_t) apr_thread_rwlock_trywrlock(apr_thread_rwlock_t *rwlock)
{
return APR_ENOTIMPL;
}
APR_DECLARE(apr_status_t) apr_thread_rwlock_unlock(apr_thread_rwlock_t *rwlock)
{
return APR_ENOTIMPL;
}
APR_DECLARE(apr_status_t) apr_thread_rwlock_destroy(apr_thread_rwlock_t *rwlock)
{
return APR_ENOTIMPL;
}
#endif /* HAVE_PTHREAD_RWLOCKS */
APR_POOL_IMPLEMENT_ACCESSOR(thread_rwlock)
#endif /* APR_HAS_THREADS */
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