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Edit File : apr_thread_cond.h \| Size : 5.40 KB
/* 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_COND_H #define APR_THREAD_COND_H /* * @file apr_thread_cond.h * @brief APR Condition Variable Routines / #include "apr.h" #include "apr_pools.h" #include "apr_errno.h" #include "apr_time.h" #include "apr_thread_mutex.h" #ifdef __cplusplus extern "C" { #endif / __cplusplus / #if APR_HAS_THREADS \|\| defined(DOXYGEN) /* * @defgroup apr_thread_cond Condition Variable Routines * @ingroup APR * @{ / /* Opaque structure for thread condition variables / typedef struct apr_thread_cond_t apr_thread_cond_t; /* * Note: destroying a condition variable (or likewise, destroying or * clearing the pool from which a condition variable was allocated) if * any threads are blocked waiting on it gives undefined results. / /* * Create and initialize a condition variable that can be used to signal * and schedule threads in a single process. * @param cond the memory address where the newly created condition variable * will be stored. * @param pool the pool from which to allocate the condition. / APR_DECLARE(apr_status_t) apr_thread_cond_create(apr_thread_cond_t cond, apr_pool_t pool); /** * Put the active calling thread to sleep until signaled to wake up. Each * condition variable must be associated with a mutex, and that mutex must * be locked before calling this function, or the behavior will be * undefined. As the calling thread is put to sleep, the given mutex * will be simultaneously released; and as this thread wakes up the lock * is again simultaneously acquired. * @param cond the condition variable on which to block. * @param mutex the mutex that must be locked upon entering this function, * is released while the thread is asleep, and is again acquired before * returning from this function. * @remark Spurious wakeups may occur. Before and after every call to wait on * a condition variable, the caller should test whether the condition is already * met. / APR_DECLARE(apr_status_t) apr_thread_cond_wait(apr_thread_cond_t cond, apr_thread_mutex_t mutex); /* * Put the active calling thread to sleep until signaled to wake up or * the timeout is reached. Each condition variable must be associated * with a mutex, and that mutex must be locked before calling this * function, or the behavior will be undefined. As the calling thread * is put to sleep, the given mutex will be simultaneously released; * and as this thread wakes up the lock is again simultaneously acquired. * @param cond the condition variable on which to block. * @param mutex the mutex that must be locked upon entering this function, * is released while the thread is asleep, and is again acquired before * returning from this function. * @param timeout The amount of time in microseconds to wait. This is * a maximum, not a minimum. If the condition is signaled, we * will wake up before this time, otherwise the error APR_TIMEUP * is returned. / APR_DECLARE(apr_status_t) apr_thread_cond_timedwait(apr_thread_cond_t cond, apr_thread_mutex_t mutex, apr_interval_time_t timeout); /* * Signals a single thread, if one exists, that is blocking on the given * condition variable. That thread is then scheduled to wake up and acquire * the associated mutex. Although it is not required, if predictable scheduling * is desired, that mutex must be locked while calling this function. * @param cond the condition variable on which to produce the signal. * @remark If no threads are waiting on the condition variable, nothing happens. / APR_DECLARE(apr_status_t) apr_thread_cond_signal(apr_thread_cond_t cond); /** * Signals all threads blocking on the given condition variable. * Each thread that was signaled is then scheduled to wake up and acquire * the associated mutex. This will happen in a serialized manner. * @param cond the condition variable on which to produce the broadcast. * @remark If no threads are waiting on the condition variable, nothing happens. / APR_DECLARE(apr_status_t) apr_thread_cond_broadcast(apr_thread_cond_t cond); /** * Destroy the condition variable and free the associated memory. * @param cond the condition variable to destroy. / APR_DECLARE(apr_status_t) apr_thread_cond_destroy(apr_thread_cond_t cond); /** * Get the pool used by this thread_cond. * @return apr_pool_t the pool / APR_POOL_DECLARE_ACCESSOR(thread_cond); #endif / APR_HAS_THREADS / /* @} / #ifdef __cplusplus } #endif #endif / ! APR_THREAD_COND_H */ Back

Edit File : apr_thread_cond.h | Size : 5.40 KB

/* 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_COND_H
#define APR_THREAD_COND_H

/**
 * @file apr_thread_cond.h
 * @brief APR Condition Variable Routines
 */

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

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

#if APR_HAS_THREADS || defined(DOXYGEN)

/**
 * @defgroup apr_thread_cond Condition Variable Routines
 * @ingroup APR 
 * @{
 */

/** Opaque structure for thread condition variables */
typedef struct apr_thread_cond_t apr_thread_cond_t;

/**
 * Note: destroying a condition variable (or likewise, destroying or
 * clearing the pool from which a condition variable was allocated) if
 * any threads are blocked waiting on it gives undefined results.
 */

/**
 * Create and initialize a condition variable that can be used to signal
 * and schedule threads in a single process.
 * @param cond the memory address where the newly created condition variable
 *        will be stored.
 * @param pool the pool from which to allocate the condition.
 */
APR_DECLARE(apr_status_t) apr_thread_cond_create(apr_thread_cond_t **cond,
                                                 apr_pool_t *pool);

/**
 * Put the active calling thread to sleep until signaled to wake up. Each
 * condition variable must be associated with a mutex, and that mutex must
 * be locked before  calling this function, or the behavior will be
 * undefined. As the calling thread is put to sleep, the given mutex
 * will be simultaneously released; and as this thread wakes up the lock
 * is again simultaneously acquired.
 * @param cond the condition variable on which to block.
 * @param mutex the mutex that must be locked upon entering this function,
 *        is released while the thread is asleep, and is again acquired before
 *        returning from this function.
 * @remark Spurious wakeups may occur. Before and after every call to wait on
 * a condition variable, the caller should test whether the condition is already
 * met.
 */
APR_DECLARE(apr_status_t) apr_thread_cond_wait(apr_thread_cond_t *cond,
                                               apr_thread_mutex_t *mutex);

/**
 * Put the active calling thread to sleep until signaled to wake up or
 * the timeout is reached. Each condition variable must be associated
 * with a mutex, and that mutex must be locked before calling this
 * function, or the behavior will be undefined. As the calling thread
 * is put to sleep, the given mutex will be simultaneously released;
 * and as this thread wakes up the lock is again simultaneously acquired.
 * @param cond the condition variable on which to block.
 * @param mutex the mutex that must be locked upon entering this function,
 *        is released while the thread is asleep, and is again acquired before
 *        returning from this function.
 * @param timeout The amount of time in microseconds to wait. This is 
 *        a maximum, not a minimum. If the condition is signaled, we 
 *        will wake up before this time, otherwise the error APR_TIMEUP
 *        is returned.
 */
APR_DECLARE(apr_status_t) apr_thread_cond_timedwait(apr_thread_cond_t *cond,
                                                    apr_thread_mutex_t *mutex,
                                                    apr_interval_time_t timeout);

/**
 * Signals a single thread, if one exists, that is blocking on the given
 * condition variable. That thread is then scheduled to wake up and acquire
 * the associated mutex. Although it is not required, if predictable scheduling
 * is desired, that mutex must be locked while calling this function.
 * @param cond the condition variable on which to produce the signal.
 * @remark If no threads are waiting on the condition variable, nothing happens.
 */
APR_DECLARE(apr_status_t) apr_thread_cond_signal(apr_thread_cond_t *cond);

/**
 * Signals all threads blocking on the given condition variable.
 * Each thread that was signaled is then scheduled to wake up and acquire
 * the associated mutex. This will happen in a serialized manner.
 * @param cond the condition variable on which to produce the broadcast.
 * @remark If no threads are waiting on the condition variable, nothing happens.
 */
APR_DECLARE(apr_status_t) apr_thread_cond_broadcast(apr_thread_cond_t *cond);

/**
 * Destroy the condition variable and free the associated memory.
 * @param cond the condition variable to destroy.
 */
APR_DECLARE(apr_status_t) apr_thread_cond_destroy(apr_thread_cond_t *cond);

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

#endif /* APR_HAS_THREADS */

/** @} */

#ifdef __cplusplus
}
#endif

#endif  /* ! APR_THREAD_COND_H */

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