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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_general.h"
#include "apr_lib.h"
#include "apr_strings.h"
#include "apr_portable.h"
#include "apr_arch_thread_mutex.h"
#include "apr_arch_thread_cond.h"
#include "apr_arch_file_io.h"
#include <string.h>
#ifndef DCE_POSTONE
#define DCE_POSTONE 0x0800 // Post one flag
#endif
static apr_status_t thread_cond_cleanup(void *data)
{
apr_thread_cond_t *cv = data;
if (cv->semaphore) {
DosCloseEventSem(cv->semaphore);
}
if (cv->mutex) {
DosCloseMutexSem(cv->mutex);
}
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_thread_cond_create(apr_thread_cond_t **cond,
apr_pool_t *pool)
{
int rc;
apr_thread_cond_t *cv;
cv = apr_pcalloc(pool, sizeof(**cond));
rc = DosCreateEventSem(NULL, &cv->semaphore, DCE_POSTONE, FALSE);
if (rc == 0) {
rc = DosCreateMutexSem(NULL, &cv->mutex, 0, FALSE);
}
*cond = cv;
cv->pool = pool;
apr_pool_cleanup_register(cv->pool, cv, thread_cond_cleanup,
apr_pool_cleanup_null);
return APR_FROM_OS_ERROR(rc);
}
static apr_status_t thread_cond_timedwait(apr_thread_cond_t *cond,
apr_thread_mutex_t *mutex,
ULONG timeout_ms )
{
ULONG rc;
apr_status_t rv = APR_SUCCESS;
int wake = FALSE;
unsigned long generation;
DosRequestMutexSem(cond->mutex, SEM_INDEFINITE_WAIT);
cond->num_waiting++;
generation = cond->generation;
DosReleaseMutexSem(cond->mutex);
apr_thread_mutex_unlock(mutex);
do {
rc = DosWaitEventSem(cond->semaphore, timeout_ms);
DosRequestMutexSem(cond->mutex, SEM_INDEFINITE_WAIT);
if (cond->num_wake) {
if (cond->generation != generation) {
cond->num_wake--;
cond->num_waiting--;
rv = APR_SUCCESS;
break;
} else {
wake = TRUE;
}
}
else if (rc != 0) {
cond->num_waiting--;
rv = APR_TIMEUP;
break;
}
DosReleaseMutexSem(cond->mutex);
if (wake) {
wake = FALSE;
DosPostEventSem(cond->semaphore);
}
} while (1);
DosReleaseMutexSem(cond->mutex);
apr_thread_mutex_lock(mutex);
return rv;
}
APR_DECLARE(apr_status_t) apr_thread_cond_wait(apr_thread_cond_t *cond,
apr_thread_mutex_t *mutex)
{
return thread_cond_timedwait(cond, mutex, SEM_INDEFINITE_WAIT);
}
APR_DECLARE(apr_status_t) apr_thread_cond_timedwait(apr_thread_cond_t *cond,
apr_thread_mutex_t *mutex,
apr_interval_time_t timeout)
{
ULONG timeout_ms = (timeout >= 0) ? apr_time_as_msec(timeout)
: SEM_INDEFINITE_WAIT;
return thread_cond_timedwait(cond, mutex, timeout_ms);
}
APR_DECLARE(apr_status_t) apr_thread_cond_signal(apr_thread_cond_t *cond)
{
int wake = FALSE;
DosRequestMutexSem(cond->mutex, SEM_INDEFINITE_WAIT);
if (cond->num_waiting > cond->num_wake) {
wake = TRUE;
cond->num_wake++;
cond->generation++;
}
DosReleaseMutexSem(cond->mutex);
if (wake) {
DosPostEventSem(cond->semaphore);
}
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_thread_cond_broadcast(apr_thread_cond_t *cond)
{
unsigned long num_wake = 0;
DosRequestMutexSem(cond->mutex, SEM_INDEFINITE_WAIT);
if (cond->num_waiting > cond->num_wake) {
num_wake = cond->num_waiting - cond->num_wake;
cond->num_wake = cond->num_waiting;
cond->generation++;
}
DosReleaseMutexSem(cond->mutex);
for (; num_wake; num_wake--) {
DosPostEventSem(cond->semaphore);
}
return APR_SUCCESS;
}
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)
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