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#ifndef _sys_Monitor_h
#define _sys_Monitor_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.
*
*/
#include <sys/errno.h>
#include <boost/noncopyable.hpp>
#include <sys/Mutex.h>
#include <sys/Time.h>
#ifdef USE_APR
# include <apr_thread_cond.h>
#endif
namespace qpid {
namespace sys {
/**
* A monitor is a condition variable and a mutex
*/
class Monitor : public Mutex
{
public:
inline Monitor();
inline ~Monitor();
inline void wait();
inline bool wait(const Time& absoluteTime);
inline void notify();
inline void notifyAll();
private:
#ifdef USE_APR
apr_thread_cond_t* condition;
#else
pthread_cond_t condition;
#endif
};
// APR ================================================================
#ifdef USE_APR
Monitor::Monitor() {
CHECK_APR_SUCCESS(apr_thread_cond_create(&condition, APRPool::get()));
}
Monitor::~Monitor() {
CHECK_APR_SUCCESS(apr_thread_cond_destroy(condition));
}
void Monitor::wait() {
CHECK_APR_SUCCESS(apr_thread_cond_wait(condition, mutex));
}
bool Monitor::wait(const Time& absoluteTime){
// APR uses microseconds.
apr_status_t status =
apr_thread_cond_timedwait(condition, mutex, absoluteTime/TIME_USEC);
if(status != APR_TIMEUP) CHECK_APR_SUCCESS(status);
return status == 0;
}
void Monitor::notify(){
CHECK_APR_SUCCESS(apr_thread_cond_signal(condition));
}
void Monitor::notifyAll(){
CHECK_APR_SUCCESS(apr_thread_cond_broadcast(condition));
}
#else
// POSIX ================================================================
Monitor::Monitor() {
QPID_POSIX_THROW_IF(pthread_cond_init(&condition, 0));
}
Monitor::~Monitor() {
QPID_POSIX_THROW_IF(pthread_cond_destroy(&condition));
}
void Monitor::wait() {
QPID_POSIX_THROW_IF(pthread_cond_wait(&condition, &mutex));
}
bool Monitor::wait(const Time& absoluteTime){
struct timespec ts;
toTimespec(ts, absoluteTime);
int status = pthread_cond_timedwait(&condition, &mutex, &ts);
if (status != 0) {
if (status == ETIMEDOUT) return false;
throw QPID_POSIX_ERROR(status);
}
return true;
}
void Monitor::notify(){
QPID_POSIX_THROW_IF(pthread_cond_signal(&condition));
}
void Monitor::notifyAll(){
QPID_POSIX_THROW_IF(pthread_cond_broadcast(&condition));
}
#endif /*USE_APR*/
}}
#endif /*!_sys_Monitor_h*/
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