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- /* ====================================================================
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2000-2003 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Apache" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
-
- #ifndef APR_THREAD_MUTEX_H
- #define APR_THREAD_MUTEX_H
-
- /**
- * @file apr_thread_mutex.h
- * @brief APR Thread Mutex Routines
- */
-
- #include "apr.h"
- #include "apr_errno.h"
-
- #ifdef __cplusplus
- extern "C" {
- #endif /* __cplusplus */
-
- #if APR_HAS_THREADS || defined(DOXYGEN)
-
- /**
- * @defgroup apr_thread_mutex Thread Mutex Routines
- * @ingroup APR
- * @{
- */
-
- /** Opaque thread-local mutex structure */
- typedef struct apr_thread_mutex_t apr_thread_mutex_t;
-
- #define APR_THREAD_MUTEX_DEFAULT 0x0 /**< platform-optimal lock behavior */
- #define APR_THREAD_MUTEX_NESTED 0x1 /**< enable nested (recursive) locks */
- #define APR_THREAD_MUTEX_UNNESTED 0x2 /**< disable nested locks */
-
- /* Delayed the include to avoid a circular reference */
- #include "apr_pools.h"
-
- /**
- * Create and initialize a mutex that can be used to synchronize threads.
- * @param mutex the memory address where the newly created mutex will be
- * stored.
- * @param flags Or'ed value of:
- * <PRE>
- * APR_THREAD_MUTEX_DEFAULT platform-optimal lock behavior.
- * APR_THREAD_MUTEX_NESTED enable nested (recursive) locks.
- * APR_THREAD_MUTEX_UNNESTED disable nested locks (non-recursive).
- * </PRE>
- * @param pool the pool from which to allocate the mutex.
- * @warning Be cautious in using APR_THREAD_MUTEX_DEFAULT. While this is the
- * most optimial mutex based on a given platform's performance charateristics,
- * it will behave as either a nested or an unnested lock.
- */
- APR_DECLARE(apr_status_t) apr_thread_mutex_create(apr_thread_mutex_t **mutex,
- unsigned int flags,
- apr_pool_t *pool);
- /**
- * Acquire the lock for the given mutex. If the mutex is already locked,
- * the current thread will be put to sleep until the lock becomes available.
- * @param mutex the mutex on which to acquire the lock.
- */
- APR_DECLARE(apr_status_t) apr_thread_mutex_lock(apr_thread_mutex_t *mutex);
-
- /**
- * Attempt to acquire the lock for the given mutex. If the mutex has already
- * been acquired, the call returns immediately with APR_EBUSY. Note: it
- * is important that the APR_STATUS_IS_EBUSY(s) macro be used to determine
- * if the return value was APR_EBUSY, for portability reasons.
- * @param mutex the mutex on which to attempt the lock acquiring.
- */
- APR_DECLARE(apr_status_t) apr_thread_mutex_trylock(apr_thread_mutex_t *mutex);
-
- /**
- * Release the lock for the given mutex.
- * @param mutex the mutex from which to release the lock.
- */
- APR_DECLARE(apr_status_t) apr_thread_mutex_unlock(apr_thread_mutex_t *mutex);
-
- /**
- * Destroy the mutex and free the memory associated with the lock.
- * @param mutex the mutex to destroy.
- */
- APR_DECLARE(apr_status_t) apr_thread_mutex_destroy(apr_thread_mutex_t *mutex);
-
- /**
- * Get the pool used by this thread_mutex.
- * @return apr_pool_t the pool
- */
- APR_POOL_DECLARE_ACCESSOR(thread_mutex);
-
- #endif /* APR_HAS_THREADS */
-
- /** @} */
-
- #ifdef __cplusplus
- }
- #endif
-
- #endif /* ! APR_THREAD_MUTEX_H */
-