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// $Id: $
/***********************************************************************
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_cmd_ThreadPool_h
#define moses_cmd_ThreadPool_h
#include <iostream>
#include <queue>
#include <vector>
#include <boost/bind.hpp>
#include <boost/thread.hpp>
#if defined(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() {}
};
class ThreadPool {
public:
/**
* Construct a thread pool of a fixed size.
**/
ThreadPool(size_t numThreads);
/**
* Add a job to the threadpool.
**/
void Submit(Task* task);
/**
* Wait until all queued jobs have completed, and shut down
* the ThreadPool.
**/
void Stop(bool processRemainingJobs = false);
~ThreadPool() { Stop(); }
private:
/**
* The main loop executed by each thread.
**/
void Execute();
std::queue<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;
};
class TestTask : public Task {
public:
TestTask(int id) : m_id(id) {}
virtual void Run() {
#if defined(BOOST_HAS_PTHREADS)
int tid = (int)pthread_self();
#else
int tid = 0;
#endif
std::cerr << "Executing " << m_id << " in thread id " << tid << std::endl;
}
virtual ~TestTask() {}
private:
int m_id;
};
}
#endif
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