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/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
* applicable.
*
* 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.h"
#include "apr_private.h"
#include "apr_general.h"
#include "apr_strings.h"
#include "apr_arch_thread_mutex.h"
#include "apr_thread_mutex.h"
#include "apr_portable.h"
#include "apr_arch_misc.h"
static apr_status_t thread_mutex_cleanup(void *data)
{
apr_thread_mutex_t *lock = data;
if (lock->type == thread_mutex_critical_section) {
lock->type = -1;
DeleteCriticalSection(&lock->section);
}
else {
if (!CloseHandle(lock->handle)) {
return apr_get_os_error();
}
}
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_thread_mutex_create(apr_thread_mutex_t **mutex,
unsigned int flags,
apr_pool_t *pool)
{
(*mutex) = (apr_thread_mutex_t *)apr_palloc(pool, sizeof(**mutex));
(*mutex)->pool = pool;
if (flags & APR_THREAD_MUTEX_UNNESTED) {
/* Use an auto-reset signaled event, ready to accept one
* waiting thread.
*/
(*mutex)->type = thread_mutex_unnested_event;
(*mutex)->handle = CreateEvent(NULL, FALSE, TRUE, NULL);
}
else {
#if APR_HAS_UNICODE_FS
/* Critical Sections are terrific, performance-wise, on NT.
* On Win9x, we cannot 'try' on a critical section, so we
* use a [slower] mutex object, instead.
*/
IF_WIN_OS_IS_UNICODE {
InitializeCriticalSection(&(*mutex)->section);
(*mutex)->type = thread_mutex_critical_section;
}
#endif
#if APR_HAS_ANSI_FS
ELSE_WIN_OS_IS_ANSI {
(*mutex)->type = thread_mutex_nested_mutex;
(*mutex)->handle = CreateMutex(NULL, FALSE, NULL);
}
#endif
}
apr_pool_cleanup_register((*mutex)->pool, (*mutex), thread_mutex_cleanup,
apr_pool_cleanup_null);
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_thread_mutex_lock(apr_thread_mutex_t *mutex)
{
if (mutex->type == thread_mutex_critical_section) {
EnterCriticalSection(&mutex->section);
}
else {
DWORD rv = WaitForSingleObject(mutex->handle, INFINITE);
if ((rv != WAIT_OBJECT_0) && (rv != WAIT_ABANDONED)) {
return (rv == WAIT_TIMEOUT) ? APR_EBUSY : apr_get_os_error();
}
}
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_thread_mutex_trylock(apr_thread_mutex_t *mutex)
{
if (mutex->type == thread_mutex_critical_section) {
if (!TryEnterCriticalSection(&mutex->section)) {
return APR_EBUSY;
}
}
else {
DWORD rv = WaitForSingleObject(mutex->handle, 0);
if ((rv != WAIT_OBJECT_0) && (rv != WAIT_ABANDONED)) {
return (rv == WAIT_TIMEOUT) ? APR_EBUSY : apr_get_os_error();
}
}
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_thread_mutex_unlock(apr_thread_mutex_t *mutex)
{
if (mutex->type == thread_mutex_critical_section) {
LeaveCriticalSection(&mutex->section);
}
else if (mutex->type == thread_mutex_unnested_event) {
if (!SetEvent(mutex->handle)) {
return apr_get_os_error();
}
}
else if (mutex->type == thread_mutex_nested_mutex) {
if (!ReleaseMutex(mutex->handle)) {
return apr_get_os_error();
}
}
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_thread_mutex_destroy(apr_thread_mutex_t *mutex)
{
return apr_pool_cleanup_run(mutex->pool, mutex, thread_mutex_cleanup);
}
APR_POOL_IMPLEMENT_ACCESSOR(thread_mutex)
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