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// $Id: ThreadPool.h 3045 2010-04-05 13:07:29Z hieuhoang1972 $
/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2009 University of Edinburgh
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
***********************************************************************/
#ifndef moses_ThreadPool_h
#define moses_ThreadPool_h
#include <iostream>
#include <queue>
#include <vector>
#include <boost/shared_ptr.hpp>
#ifdef WITH_THREADS
#include <boost/bind.hpp>
#include <boost/thread.hpp>
#endif
#ifdef BOOST_HAS_PTHREADS
#include <pthread.h>
#endif
//#include "Util.h"
/**
* Classes to implement a ThreadPool.
**/
namespace Moses
{
/** A task to be executed by the ThreadPool
*/
class Task
{
public:
virtual void Run() = 0;
virtual ~Task() {}
};
#ifdef WITH_THREADS
class ThreadPool
{
public:
/**
* Construct a thread pool of a fixed size.
**/
explicit ThreadPool(size_t numThreads);
~ThreadPool() {
Stop();
}
/**
* Add a job to the threadpool.
**/
void Submit(boost::shared_ptr<Task> task);
/**
* Wait until all queued jobs have completed, and shut down
* the ThreadPool.
**/
void Stop(bool processRemainingJobs = false);
/**
* Set maximum number of queued threads (otherwise Submit blocks)
**/
void SetQueueLimit( size_t limit ) {
m_queueLimit = limit;
}
private:
/**
* The main loop executed by each thread.
**/
void Execute();
std::queue<boost::shared_ptr<Task> > m_tasks;
boost::thread_group m_threads;
boost::mutex m_mutex;
boost::condition_variable m_threadNeeded;
boost::condition_variable m_threadAvailable;
bool m_stopped;
bool m_stopping;
size_t m_queueLimit;
};
class TestTask : public Task
{
public:
TestTask(int id) : m_id(id) {}
virtual void Run() {
#ifdef BOOST_HAS_PTHREADS
pthread_t tid = pthread_self();
#else
typedef void * pthread_t;
pthread_t tid = 0;
#endif
std::cerr << "Executing " << m_id << " in thread id " << tid << std::endl;
}
virtual ~TestTask() {}
private:
int m_id;
};
#endif //WITH_THREADS
} // namespace Moses
#endif // moses_ThreadPool_h
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