+++ /dev/null
-/* 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_THREAD_RWLOCK_H
-#define APR_THREAD_RWLOCK_H
-
-/**
- * @file apr_thread_rwlock.h
- * @brief APR Reader/Writer Lock Routines
- */
-
-#include "apr.h"
-#include "apr_pools.h"
-#include "apr_errno.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-#if APR_HAS_THREADS
-
-/**
- * @defgroup apr_thread_rwlock Reader/Writer Lock Routines
- * @ingroup APR
- * @{
- */
-
-/** Opaque read-write thread-safe lock. */
-typedef struct apr_thread_rwlock_t apr_thread_rwlock_t;
-
-/**
- * Create and initialize a read-write lock that can be used to synchronize
- * threads.
- * @param rwlock the memory address where the newly created readwrite lock
- * will be stored.
- * @param pool the pool from which to allocate the mutex.
- */
-APR_DECLARE(apr_status_t) apr_thread_rwlock_create(apr_thread_rwlock_t **rwlock,
- apr_pool_t *pool);
-/**
- * Acquire a shared-read lock on the given read-write lock. This will allow
- * multiple threads to enter the same critical section while they have acquired
- * the read lock.
- * @param rwlock the read-write lock on which to acquire the shared read.
- */
-APR_DECLARE(apr_status_t) apr_thread_rwlock_rdlock(apr_thread_rwlock_t *rwlock);
-
-/**
- * Attempt to acquire the shread-read lock on the given read-write lock. This
- * is the same as apr_thread_rwlock_rdlock(), only that the funtion fails
- * if there is another thread holding the write lock, or if there are any
- * write threads blocking on the lock. If the function failes for this case,
- * APR_EBUSY will be returned. 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 rwlock the rwlock on which to attempt the shared read.
- */
-APR_DECLARE(apr_status_t) apr_thread_rwlock_tryrdlock(apr_thread_rwlock_t *rwlock);
-
-/**
- * Acquire an exclusive-write lock on the given read-write lock. This will
- * allow only one single thread to enter the critical sections. If there
- * are any threads currently holding thee read-lock, this thread is put to
- * sleep until it can have exclusive access to the lock.
- * @param rwlock the read-write lock on which to acquire the exclusive write.
- */
-APR_DECLARE(apr_status_t) apr_thread_rwlock_wrlock(apr_thread_rwlock_t *rwlock);
-
-/**
- * Attempt to acquire the exclusive-write lock on the given read-write lock.
- * This is the same as apr_thread_rwlock_wrlock(), only that the funtion fails
- * if there is any other thread holding the lock (for reading or writing),
- * in which case the function will return 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 rwlock the rwlock on which to attempt the exclusive write.
- */
-APR_DECLARE(apr_status_t) apr_thread_rwlock_trywrlock(apr_thread_rwlock_t *rwlock);
-
-/**
- * Release either the read or write lock currently held by the calling thread
- * associated with the given read-write lock.
- * @param rwlock the read-write lock to be released (unlocked).
- */
-APR_DECLARE(apr_status_t) apr_thread_rwlock_unlock(apr_thread_rwlock_t *rwlock);
-
-/**
- * Destroy the read-write lock and free the associated memory.
- * @param rwlock the rwlock to destroy.
- */
-APR_DECLARE(apr_status_t) apr_thread_rwlock_destroy(apr_thread_rwlock_t *rwlock);
-
-/**
- * Get the pool used by this thread_rwlock.
- * @return apr_pool_t the pool
- */
-APR_POOL_DECLARE_ACCESSOR(thread_rwlock);
-
-#endif /* APR_HAS_THREADS */
-
-/** @} */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* ! APR_THREAD_RWLOCK_H */
Code Review / bottlenecks.git / blobdiff