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/* 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_wqueue.h"
#include "apr_thread_cond.h"
struct apr_wqueue_t {
apr_pool_t *pool;
apr_thread_cond_t *cond;
apr_thread_mutex_t *mutex;
APR_RING_HEAD(wait_ring_t, apr_wqueue_entry_t) ring;
};
static apr_status_t plain_cleanup(void *data)
{
apr_wqueue_t *wqueue = data;
apr_thread_cond_destroy(wqueue->cond);
apr_thread_mutex_destroy(wqueue->mutex);
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_wqueue_create(apr_wqueue_t **wqueue, apr_pool_t *pool)
{
apr_status_t rv;
apr_wqueue_t *wq;
wq = apr_pcalloc(pool, sizeof(*wq));
if (wq == NULL) {
return APR_ENOMEM;
}
rv = apr_thread_mutex_create(&wq->mutex, APR_THREAD_MUTEX_NESTED, pool);
if (rv != APR_SUCCESS) {
return rv;
}
rv = apr_thread_cond_create(&wq->cond, pool);
if (rv != APR_SUCCESS) {
return rv;
}
*wqueue = wq;
wq->pool = pool;
APR_RING_INIT(&wq->ring, apr_wqueue_entry_t, link);
apr_pool_cleanup_register(pool, wq, plain_cleanup, apr_pool_cleanup_null);
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_wqueue_destroy(apr_wqueue_t *wqueue)
{
return apr_pool_cleanup_run(wqueue->pool, wqueue, plain_cleanup);
}
static APR_INLINE void queue_lock(apr_wqueue_t *wqueue)
{
apr_status_t rv = apr_thread_mutex_lock(wqueue->mutex);
}
static APR_INLINE void queue_unlock(apr_wqueue_t *wqueue)
{
apr_status_t rv = apr_thread_mutex_unlock(wqueue->mutex);
}
APR_DECLARE(apr_status_t) apr_wqueue_add(apr_wqueue_t *wqueue, apr_wqueue_entry_t *entry)
{
APR_RING_ELEM_INIT(entry, link);
queue_lock(wqueue);
APR_RING_INSERT_TAIL(&wqueue->ring, entry, apr_wqueue_entry_t, link);
queue_unlock(wqueue);
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_wqueue_remove(apr_wqueue_t *wqueue, apr_wqueue_entry_t *entry)
{
queue_lock(wqueue);
APR_RING_REMOVE(entry, link);
queue_unlock(wqueue);
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_wqueue_wake(apr_wqueue_t *wqueue, apr_uint32_t *nwake)
{
apr_status_t rv;
apr_int32_t count = *nwake;
apr_wqueue_entry_t *entry, *next;
*nwake = 0;
queue_lock(wqueue);
APR_RING_FOREACH_SAFE(entry, next, &wqueue->ring,
apr_wqueue_entry_t, link) {
rv = entry->func(wqueue, entry->data);
if (rv != APR_SUCCESS) {
continue;
}
(*nwake)++;
APR_RING_REMOVE(entry, link);
if (count && !--count) {
break;
}
}
queue_unlock(wqueue);
return APR_SUCCESS;
}
static apr_status_t wqueue_func(apr_wqueue_t *wqueue, void *data)
{
return apr_thread_cond_signal(wqueue->cond);
}
APR_DECLARE(apr_status_t) apr_wqueue_wait(apr_wqueue_t *wqueue, apr_interval_time_t timeout)
{
apr_status_t rv;
apr_wqueue_entry_t entry;
entry.func = wqueue_func;
entry.data = NULL;
APR_RING_ELEM_INIT(&entry, link);
queue_lock(wqueue);
APR_RING_INSERT_TAIL(&wqueue->ring, &entry, apr_wqueue_entry_t, link);
if (timeout < 0) {
rv = apr_thread_cond_wait(wqueue->cond, wqueue->mutex);
} else {
rv = apr_thread_cond_timedwait(wqueue->cond, wqueue->mutex, timeout);
}
APR_RING_REMOVE(&entry, link);
queue_unlock(queue);
return rv;
}
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