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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_proc_mutex.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_PROC_MUTEX_H
#define APR_PROC_MUTEX_H

/**
 * @file apr_proc_mutex.h
 * @brief APR Process Locking Routines
 */

#include "apr.h"
#include "apr_pools.h"
#include "apr_errno.h"
#include "apr_perms_set.h"
#include "apr_time.h"

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

/**
 * @defgroup apr_proc_mutex Process Locking Routines
 * @ingroup APR 
 * @{
 */

/** 
 * Enumerated potential types for APR process locking methods
 * @warning Check APR_HAS_foo_SERIALIZE defines to see if the platform supports
 *          APR_LOCK_foo.  Only APR_LOCK_DEFAULT is portable.
 */
typedef enum {
    APR_LOCK_FCNTL,         /**< fcntl() */
    APR_LOCK_FLOCK,         /**< flock() */
    APR_LOCK_SYSVSEM,       /**< System V Semaphores */
    APR_LOCK_PROC_PTHREAD,  /**< POSIX pthread process-based locking */
    APR_LOCK_POSIXSEM,      /**< POSIX semaphore process-based locking */
    APR_LOCK_DEFAULT,       /**< Use the default process lock */
    APR_LOCK_DEFAULT_TIMED  /**< Use the default process timed lock */
} apr_lockmech_e;

/** Opaque structure representing a process mutex. */
typedef struct apr_proc_mutex_t apr_proc_mutex_t;

/*   Function definitions */

/**
 * Create and initialize a mutex that can be used to synchronize processes.
 * @param mutex the memory address where the newly created mutex will be
 *        stored.
 * @param fname A file name to use if the lock mechanism requires one.  This
 *        argument should always be provided.  The lock code itself will
 *        determine if it should be used.
 * @param mech The mechanism to use for the interprocess lock, if any; one of
 * <PRE>
 *            APR_LOCK_FCNTL
 *            APR_LOCK_FLOCK
 *            APR_LOCK_SYSVSEM
 *            APR_LOCK_POSIXSEM
 *            APR_LOCK_PROC_PTHREAD
 *            APR_LOCK_DEFAULT     pick the default mechanism for the platform
 * </PRE>
 * @param pool the pool from which to allocate the mutex.
 * @see apr_lockmech_e
 * @warning Check APR_HAS_foo_SERIALIZE defines to see if the platform supports
 *          APR_LOCK_foo.  Only APR_LOCK_DEFAULT is portable.
 */
APR_DECLARE(apr_status_t) apr_proc_mutex_create(apr_proc_mutex_t **mutex,
                                                const char *fname,
                                                apr_lockmech_e mech,
                                                apr_pool_t *pool);

/**
 * Re-open a mutex in a child process.
 * @param mutex The newly re-opened mutex structure.
 * @param fname A file name to use if the mutex mechanism requires one.  This
 *              argument should always be provided.  The mutex code itself will
 *              determine if it should be used.  This filename should be the 
 *              same one that was passed to apr_proc_mutex_create().
 * @param pool The pool to operate on.
 * @remark This function must be called to maintain portability, even
 *         if the underlying lock mechanism does not require it.
 */
APR_DECLARE(apr_status_t) apr_proc_mutex_child_init(apr_proc_mutex_t **mutex,
                                                    const char *fname,
                                                    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_proc_mutex_lock(apr_proc_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_proc_mutex_trylock(apr_proc_mutex_t *mutex);

/**
 * Attempt to acquire the lock for the given mutex until timeout expires.
 * If the acquisition time outs, the call returns with APR_TIMEUP.
 * @param mutex the mutex on which to attempt the lock acquiring.
 * @param timeout the relative timeout (microseconds).
 * @note A negative or nul timeout means immediate attempt, returning
 *       APR_TIMEUP without blocking if it the lock is already acquired.
 */
APR_DECLARE(apr_status_t) apr_proc_mutex_timedlock(apr_proc_mutex_t *mutex,
                                               apr_interval_time_t timeout);

/**
 * Release the lock for the given mutex.
 * @param mutex the mutex from which to release the lock.
 */
APR_DECLARE(apr_status_t) apr_proc_mutex_unlock(apr_proc_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_proc_mutex_destroy(apr_proc_mutex_t *mutex);

/**
 * Destroy the mutex and free the memory associated with the lock.
 * @param mutex the mutex to destroy.
 * @note This function is generally used to kill a cleanup on an already
 *       created mutex
 */
APR_DECLARE(apr_status_t) apr_proc_mutex_cleanup(void *mutex);

/**
 * Return the name of the lockfile for the mutex, or NULL
 * if the mutex doesn't use a lock file
 */

APR_DECLARE(const char *) apr_proc_mutex_lockfile(apr_proc_mutex_t *mutex);

/**
 * Get the mechanism of the mutex, as it relates to the actual method
 * used for the underlying apr_proc_mutex_t.
 * @param mutex the mutex to get the mechanism from.
 */
APR_DECLARE(apr_lockmech_e) apr_proc_mutex_mech(apr_proc_mutex_t *mutex);

/**
 * Get the mechanism's name of the mutex, as it relates to the actual method
 * used for the underlying apr_proc_mutex_t.
 * @param mutex the mutex to get the mechanism's name from.
 */
APR_DECLARE(const char *) apr_proc_mutex_name(apr_proc_mutex_t *mutex);

/**
 * Display the name of the default mutex: APR_LOCK_DEFAULT
 */
APR_DECLARE(const char *) apr_proc_mutex_defname(void);

/**
 * Set mutex permissions.
 */
APR_PERMS_SET_IMPLEMENT(proc_mutex);

/**
 * Get the pool used by this proc_mutex.
 * @return apr_pool_t the pool
 */
APR_POOL_DECLARE_ACCESSOR(proc_mutex);

/** @} */

#ifdef __cplusplus
}
#endif

#endif  /* ! APR_PROC_MUTEX_H */

${this.title}

Code Editor : apr_proc_mutex.h