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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_mutex.h"
#include "apr_arch_thread_cond.h"
#include "apr_strings.h"
#include "apr_portable.h"
static apr_status_t thread_cond_cleanup(void *data)
{
struct waiter *w;
apr_thread_cond_t *cond = (apr_thread_cond_t *)data;
acquire_sem(cond->lock);
delete_sem(cond->lock);
return APR_SUCCESS;
}
static struct waiter_t *make_waiter(apr_pool_t *pool)
{
struct waiter_t *w = (struct waiter_t*)
apr_palloc(pool, sizeof(struct waiter_t));
if (w == NULL)
return NULL;
w->sem = create_sem(0, "apr conditional waiter");
if (w->sem < 0)
return NULL;
APR_RING_ELEM_INIT(w, link);
return w;
}
APR_DECLARE(apr_status_t) apr_thread_cond_create(apr_thread_cond_t **cond,
apr_pool_t *pool)
{
apr_thread_cond_t *new_cond;
sem_id rv;
int i;
new_cond = (apr_thread_cond_t *)apr_palloc(pool, sizeof(apr_thread_cond_t));
if (new_cond == NULL)
return APR_ENOMEM;
if ((rv = create_sem(1, "apr conditional lock")) < B_OK)
return rv;
new_cond->lock = rv;
new_cond->pool = pool;
APR_RING_INIT(&new_cond->alist, waiter_t, link);
APR_RING_INIT(&new_cond->flist, waiter_t, link);
for (i=0;i < 10 ;i++) {
struct waiter_t *nw = make_waiter(pool);
APR_RING_INSERT_TAIL(&new_cond->flist, nw, waiter_t, link);
}
apr_pool_cleanup_register(new_cond->pool,
(void *)new_cond, thread_cond_cleanup,
apr_pool_cleanup_null);
*cond = new_cond;
return APR_SUCCESS;
}
static apr_status_t do_wait(apr_thread_cond_t *cond, apr_thread_mutex_t *mutex,
int timeout)
{
struct waiter_t *wait;
thread_id cth = find_thread(NULL);
apr_status_t rv;
int flags = B_RELATIVE_TIMEOUT;
/* We must be the owner of the mutex or we can't do this... */
if (mutex->owner != cth) {
/* What should we return??? */
return APR_EINVAL;
}
acquire_sem(cond->lock);
wait = APR_RING_FIRST(&cond->flist);
if (wait)
APR_RING_REMOVE(wait, link);
else
wait = make_waiter(cond->pool);
APR_RING_INSERT_TAIL(&cond->alist, wait, waiter_t, link);
cond->condlock = mutex;
release_sem(cond->lock);
apr_thread_mutex_unlock(cond->condlock);
if (timeout == 0)
flags = 0;
rv = acquire_sem_etc(wait->sem, 1, flags, timeout);
apr_thread_mutex_lock(cond->condlock);
if (rv != B_OK)
if (rv == B_TIMED_OUT)
return APR_TIMEUP;
return rv;
acquire_sem(cond->lock);
APR_RING_REMOVE(wait, link);
APR_RING_INSERT_TAIL(&cond->flist, wait, waiter_t, link);
release_sem(cond->lock);
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_thread_cond_wait(apr_thread_cond_t *cond,
apr_thread_mutex_t *mutex)
{
return do_wait(cond, mutex, 0);
}
APR_DECLARE(apr_status_t) apr_thread_cond_timedwait(apr_thread_cond_t *cond,
apr_thread_mutex_t *mutex,
apr_interval_time_t timeout)
{
return do_wait(cond, mutex, timeout);
}
APR_DECLARE(apr_status_t) apr_thread_cond_signal(apr_thread_cond_t *cond)
{
struct waiter_t *wake;
acquire_sem(cond->lock);
if (!APR_RING_EMPTY(&cond->alist, waiter_t, link)) {
wake = APR_RING_FIRST(&cond->alist);
APR_RING_REMOVE(wake, link);
release_sem(wake->sem);
APR_RING_INSERT_TAIL(&cond->flist, wake, waiter_t, link);
}
release_sem(cond->lock);
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_thread_cond_broadcast(apr_thread_cond_t *cond)
{
struct waiter_t *wake;
acquire_sem(cond->lock);
while (! APR_RING_EMPTY(&cond->alist, waiter_t, link)) {
wake = APR_RING_FIRST(&cond->alist);
APR_RING_REMOVE(wake, link);
release_sem(wake->sem);
APR_RING_INSERT_TAIL(&cond->flist, wake, waiter_t, link);
}
release_sem(cond->lock);
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_thread_cond_destroy(apr_thread_cond_t *cond)
{
apr_status_t stat;
if ((stat = thread_cond_cleanup(cond)) == APR_SUCCESS) {
apr_pool_cleanup_kill(cond->pool, cond, thread_cond_cleanup);
return APR_SUCCESS;
}
return stat;
}
APR_POOL_IMPLEMENT_ACCESSOR(thread_cond)
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