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#ifndef _sys_Monitor_h
#define _sys_Monitor_h
/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed 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 <boost/noncopyable.hpp>
#ifdef USE_APR
# include <apr-1/apr_thread_mutex.h>
# include <apr-1/apr_thread_cond.h>
# include <qpid/apr/APRBase.h>
# include <qpid/apr/APRPool.h>
#else
# include <pthread.h>
# include <qpid/sys/Time.h>
# include <qpid/posix/check.h>
#endif
namespace qpid {
namespace sys {
template <class L>
class ScopedLock
{
public:
ScopedLock(L& l) : mutex(l) { l.lock(); }
~ScopedLock() { mutex.unlock(); }
private:
L& mutex;
};
class Mutex : private boost::noncopyable
{
public:
typedef ScopedLock<Mutex> ScopedLock;
inline Mutex();
inline ~Mutex();
inline void lock();
inline void unlock();
inline void trylock();
protected:
#ifdef USE_APR
apr_thread_mutex_t* mutex;
#else
pthread_mutex_t mutex;
#endif
};
/** A condition variable and a mutex */
class Monitor : public Mutex
{
public:
inline Monitor();
inline ~Monitor();
inline void wait();
inline bool wait(int64_t nsecs);
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
Mutex::Mutex() {
CHECK_APR_SUCCESS(apr_thread_mutex_create(&mutex, APR_THREAD_MUTEX_NESTED, APRPool::get()));
}
Mutex::~Mutex(){
CHECK_APR_SUCCESS(apr_thread_mutex_destroy(mutex));
}
void Mutex::lock() {
CHECK_APR_SUCCESS(apr_thread_mutex_lock(mutex));
}
void Mutex::unlock() {
CHECK_APR_SUCCESS(apr_thread_mutex_unlock(mutex));
}
void Mutex::trylock() {
CHECK_APR_SUCCESS(apr_thread_mutex_trylock(mutex));
}
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(int64_t nsecs){
// APR uses microseconds.
apr_status_t status = apr_thread_cond_timedwait(
condition, mutex, nsecs/1000);
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));
}
}}
// POSIX ================================================================
#else
/**
* PODMutex is a POD, can be static-initialized with
* PODMutex m = QPID_PODMUTEX_INITIALIZER
*/
struct PODMutex
{
typedef ScopedLock<PODMutex> ScopedLock;
inline void lock();
inline void unlock();
inline void trylock();
// Must be public to be a POD:
pthread_mutex_t mutex;
};
#define QPID_MUTEX_INITIALIZER { PTHREAD_MUTEX_INITIALIZER }
void PODMutex::lock() {
CHECK(pthread_mutex_lock(&mutex));
}
void PODMutex::unlock() {
CHECK(pthread_mutex_unlock(&mutex));
}
void PODMutex::trylock() {
CHECK(pthread_mutex_trylock(&mutex));
}
Mutex::Mutex() {
CHECK(pthread_mutex_init(&mutex, 0));
}
Mutex::~Mutex(){
CHECK(pthread_mutex_destroy(&mutex));
}
void Mutex::lock() {
CHECK(pthread_mutex_lock(&mutex));
}
void Mutex::unlock() {
CHECK(pthread_mutex_unlock(&mutex));
}
void Mutex::trylock() {
CHECK(pthread_mutex_trylock(&mutex));
}
Monitor::Monitor() {
CHECK(pthread_cond_init(&condition, 0));
}
Monitor::~Monitor() {
CHECK(pthread_cond_destroy(&condition));
}
void Monitor::wait() {
CHECK(pthread_cond_wait(&condition, &mutex));
}
bool Monitor::wait(int64_t nsecs){
Time t(nsecs);
int status = pthread_cond_timedwait(&condition, &mutex, &t.getTimespec());
if(status != 0) {
if (errno == ETIMEDOUT) return false;
CHECK(status);
}
return true;
}
void Monitor::notify(){
CHECK(pthread_cond_signal(&condition));
}
void Monitor::notifyAll(){
CHECK(pthread_cond_broadcast(&condition));
}
}}
#endif /*USE_APR*/
#endif /*!_sys_Monitor_h*/
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