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Name	Size	Permission
apr-x86_64.h	17.89 KB	-rw-r--r--
apr.h	636 B	-rw-r--r--
apr_allocator.h	6.07 KB	-rw-r--r--
apr_anylock.h	4.93 KB	-rw-r--r--
apr_atomic.h	6.04 KB	-rw-r--r--
apr_base64.h	3.75 KB	-rw-r--r--
apr_buckets.h	63.15 KB	-rw-r--r--
apr_crypto.h	19.68 KB	-rw-r--r--
apr_cstr.h	11.13 KB	-rw-r--r--
apr_date.h	3.47 KB	-rw-r--r--
apr_dbd.h	23.35 KB	-rw-r--r--
apr_dbm.h	8.4 KB	-rw-r--r--
apr_dso.h	2.64 KB	-rw-r--r--
apr_encode.h	30.35 KB	-rw-r--r--
apr_env.h	2.06 KB	-rw-r--r--
apr_errno.h	53.77 KB	-rw-r--r--
apr_escape.h	17.23 KB	-rw-r--r--
apr_file_info.h	17.17 KB	-rw-r--r--
apr_file_io.h	42.88 KB	-rw-r--r--
apr_fnmatch.h	6.08 KB	-rw-r--r--
apr_general.h	7.34 KB	-rw-r--r--
apr_getopt.h	5.84 KB	-rw-r--r--
apr_global_mutex.h	7.19 KB	-rw-r--r--
apr_hash.h	10.08 KB	-rw-r--r--
apr_hooks.h	12.36 KB	-rw-r--r--
apr_inherit.h	2.09 KB	-rw-r--r--
apr_ldap.h	5.57 KB	-rw-r--r--
apr_ldap_init.h	5.64 KB	-rw-r--r--
apr_ldap_option.h	8.4 KB	-rw-r--r--
apr_ldap_rebind.h	3.09 KB	-rw-r--r--
apr_ldap_url.h	3.71 KB	-rw-r--r--
apr_lib.h	8.23 KB	-rw-r--r--
apr_md4.h	4.42 KB	-rw-r--r--
apr_md5.h	6.2 KB	-rw-r--r--
apr_memcache.h	16.82 KB	-rw-r--r--
apr_mmap.h	5.01 KB	-rw-r--r--
apr_network_io.h	36.02 KB	-rw-r--r--
apr_optional.h	2.71 KB	-rw-r--r--
apr_optional_hooks.h	3.78 KB	-rw-r--r--
apr_perms_set.h	1.86 KB	-rw-r--r--
apr_poll.h	20.6 KB	-rw-r--r--
apr_pools.h	30.94 KB	-rw-r--r--
apr_portable.h	20.02 KB	-rw-r--r--
apr_proc_mutex.h	6.85 KB	-rw-r--r--
apr_queue.h	3.98 KB	-rw-r--r--
apr_random.h	4.92 KB	-rw-r--r--
apr_redis.h	15.62 KB	-rw-r--r--
apr_reslist.h	7.01 KB	-rw-r--r--
apr_ring.h	18.78 KB	-rw-r--r--
apr_rmm.h	4.67 KB	-rw-r--r--
apr_sdbm.h	5.97 KB	-rw-r--r--
apr_sha1.h	3.79 KB	-rw-r--r--
apr_shm.h	9.26 KB	-rw-r--r--
apr_signal.h	2.7 KB	-rw-r--r--
apr_siphash.h	6.01 KB	-rw-r--r--
apr_skiplist.h	14.19 KB	-rw-r--r--
apr_strings.h	14.55 KB	-rw-r--r--
apr_strmatch.h	2.61 KB	-rw-r--r--
apr_support.h	1.6 KB	-rw-r--r--
apr_tables.h	18.9 KB	-rw-r--r--
apr_thread_cond.h	5.4 KB	-rw-r--r--
apr_thread_mutex.h	4.39 KB	-rw-r--r--
apr_thread_pool.h	10.84 KB	-rw-r--r--
apr_thread_proc.h	36.8 KB	-rw-r--r--
apr_thread_rwlock.h	4.65 KB	-rw-r--r--
apr_time.h	7.39 KB	-rw-r--r--
apr_uri.h	6.43 KB	-rw-r--r--
apr_user.h	5.19 KB	-rw-r--r--
apr_uuid.h	2.05 KB	-rw-r--r--
apr_version.h	5.22 KB	-rw-r--r--
apr_want.h	2.89 KB	-rw-r--r--
apr_xlate.h	6.26 KB	-rw-r--r--
apr_xml.h	12.19 KB	-rw-r--r--
apu.h	4.22 KB	-rw-r--r--
apu_errno.h	5.32 KB	-rw-r--r--
apu_version.h	4.2 KB	-rw-r--r--
apu_want.h	1.45 KB	-rw-r--r--

Code Editor : apr_thread_rwlock.h

/* 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;

/**
 * Note: The following operations have undefined results: unlocking a
 * read-write lock which is not locked in the calling thread; write
 * locking a read-write lock which is already locked by the calling
 * thread; destroying a read-write lock more than once; clearing or
 * destroying the pool from which a <b>locked</b> read-write lock is
 * allocated.
 */

/**
 * 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 shared-read lock on the given read-write lock. This
 * is the same as apr_thread_rwlock_rdlock(), only that the function fails
 * if there is another thread holding the write lock, or if there are any
 * write threads blocking on the lock. If the function fails 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 the 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 function 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 */

${this.title}

Code Editor : apr_thread_rwlock.h