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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