apr_global_mutex.h

Go to the documentation of this file.

/* 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.
 */

#ifndef APR_GLOBAL_MUTEX_H
#define APR_GLOBAL_MUTEX_H

#include "apr.h"
#include "apr_proc_mutex.h"    /* only for apr_lockmech_e */
#include "apr_pools.h"
#include "apr_errno.h"
#if APR_PROC_MUTEX_IS_GLOBAL
#include "apr_proc_mutex.h"
#endif

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#if !APR_PROC_MUTEX_IS_GLOBAL || defined(DOXYGEN)

typedef struct apr_global_mutex_t apr_global_mutex_t;

/*   Function definitions */

APR_DECLARE(apr_status_t) apr_global_mutex_create(apr_global_mutex_t **mutex,
                                                  const char *fname,
                                                  apr_lockmech_e mech,
                                                  apr_pool_t *pool);

APR_DECLARE(apr_status_t) apr_global_mutex_child_init(
                              apr_global_mutex_t **mutex,
                              const char *fname,
                              apr_pool_t *pool);

APR_DECLARE(apr_status_t) apr_global_mutex_lock(apr_global_mutex_t *mutex);

APR_DECLARE(apr_status_t) apr_global_mutex_trylock(apr_global_mutex_t *mutex);

APR_DECLARE(apr_status_t) apr_global_mutex_unlock(apr_global_mutex_t *mutex);

APR_DECLARE(apr_status_t) apr_global_mutex_destroy(apr_global_mutex_t *mutex);

APR_DECLARE(const char *) apr_global_mutex_lockfile(apr_global_mutex_t *mutex);

APR_DECLARE(const char *) apr_global_mutex_name(apr_global_mutex_t *mutex);

APR_POOL_DECLARE_ACCESSOR(global_mutex);

#else /* APR_PROC_MUTEX_IS_GLOBAL */

/* Some platforms [e.g. Win32] have cross process locks that are truly
 * global locks, since there isn't the concept of cross-process locks.
 * Define these platforms in terms of an apr_proc_mutex_t.
 */

#define apr_global_mutex_t          apr_proc_mutex_t
#define apr_global_mutex_create     apr_proc_mutex_create
#define apr_global_mutex_child_init apr_proc_mutex_child_init
#define apr_global_mutex_lock       apr_proc_mutex_lock
#define apr_global_mutex_trylock    apr_proc_mutex_trylock
#define apr_global_mutex_unlock     apr_proc_mutex_unlock
#define apr_global_mutex_destroy    apr_proc_mutex_destroy
#define apr_global_mutex_lockfile   apr_proc_mutex_lockfile
#define apr_global_mutex_name       apr_proc_mutex_name
#define apr_global_mutex_pool_get   apr_proc_mutex_pool_get

#endif

#ifdef __cplusplus
}
#endif

#endif  /* ndef APR_GLOBAL_MUTEX_H */