thread_cond.c

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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.h"
 
#if APR_HAS_THREADS
 
#include "apr_arch_thread_mutex.h"
#include "apr_arch_thread_cond.h"
 
static apr_status_t thread_cond_cleanup(void *data)
{
    apr_thread_cond_t *cond = (apr_thread_cond_t *)data;
    apr_status_t rv;
 
    rv = pthread_cond_destroy(&cond->cond);
#ifdef HAVE_ZOS_PTHREADS
    if (rv) {
        rv = errno;
    }
#endif
    return rv;
} 
 
APR_DECLARE(apr_status_t) apr_thread_cond_create(apr_thread_cond_t **cond,
                                                 apr_pool_t *pool)
{
    apr_thread_cond_t *new_cond;
    apr_status_t rv;
 
    new_cond = apr_palloc(pool, sizeof(apr_thread_cond_t));
 
    new_cond->pool = pool;
 
    if ((rv = pthread_cond_init(&new_cond->cond, NULL))) {
#ifdef HAVE_ZOS_PTHREADS
        rv = errno;
#endif
        return rv;
    }
 
    apr_pool_cleanup_register(new_cond->pool,
                              (void *)new_cond, thread_cond_cleanup,
                              apr_pool_cleanup_null);
 
    *cond = new_cond;
    return APR_SUCCESS;
}
 
APR_DECLARE(apr_status_t) apr_thread_cond_wait(apr_thread_cond_t *cond,
                                               apr_thread_mutex_t *mutex)
{
    apr_status_t rv;
 
    rv = pthread_cond_wait(&cond->cond, &mutex->mutex);
#ifdef HAVE_ZOS_PTHREADS
    if (rv) {
        rv = errno;
    }
#endif
    return rv;
}
 
APR_DECLARE(apr_status_t) apr_thread_cond_timedwait(apr_thread_cond_t *cond,
                                                    apr_thread_mutex_t *mutex,
                                                    apr_interval_time_t timeout)
{
    apr_status_t rv;
    if (timeout < 0) {
        rv = pthread_cond_wait(&cond->cond, &mutex->mutex);
#ifdef HAVE_ZOS_PTHREADS
        if (rv) {
            rv = errno;
        }
#endif
    }
    else {
        apr_time_t then;
        struct timespec abstime;
 
        then = apr_time_now() + timeout;
        abstime.tv_sec = apr_time_sec(then);
        abstime.tv_nsec = apr_time_usec(then) * 1000; /* nanoseconds */
 
        rv = pthread_cond_timedwait(&cond->cond, &mutex->mutex, &abstime);
#ifdef HAVE_ZOS_PTHREADS
        if (rv) {
            rv = errno;
        }
#endif
        if (ETIMEDOUT == rv) {
            return APR_TIMEUP;
        }
    }
    return rv;
}
 
 
APR_DECLARE(apr_status_t) apr_thread_cond_signal(apr_thread_cond_t *cond)
{
    apr_status_t rv;
 
    rv = pthread_cond_signal(&cond->cond);
#ifdef HAVE_ZOS_PTHREADS
    if (rv) {
        rv = errno;
    }
#endif
    return rv;
}
 
APR_DECLARE(apr_status_t) apr_thread_cond_broadcast(apr_thread_cond_t *cond)
{
    apr_status_t rv;
 
    rv = pthread_cond_broadcast(&cond->cond);
#ifdef HAVE_ZOS_PTHREADS
    if (rv) {
        rv = errno;
    }
#endif
    return rv;
}
 
APR_DECLARE(apr_status_t) apr_thread_cond_destroy(apr_thread_cond_t *cond)
{
    return apr_pool_cleanup_run(cond->pool, cond, thread_cond_cleanup);
}
 
APR_POOL_IMPLEMENT_ACCESSOR(thread_cond)
 
#endif /* APR_HAS_THREADS */