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105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
// $Id: ThreadPool.cpp 3045 2010-04-05 13:07:29Z hieuhoang1972 $
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/***********************************************************************
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Moses - factored phrase-based language decoder
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Copyright (C) 2009 University of Edinburgh
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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***********************************************************************/
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#include "ThreadPool.h"
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#ifdef WITH_THREADS
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using namespace std;
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using namespace Moses;
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namespace Moses
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{
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ThreadPool::ThreadPool( size_t numThreads )
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: m_stopped(false), m_stopping(false), m_queueLimit(0)
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{
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for (size_t i = 0; i < numThreads; ++i) {
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m_threads.create_thread(boost::bind(&ThreadPool::Execute,this));
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}
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}
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void ThreadPool::Execute()
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{
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do {
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boost::shared_ptr<Task> task;
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{
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// Find a job to perform
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boost::mutex::scoped_lock lock(m_mutex);
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if (m_tasks.empty() && !m_stopped) {
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m_threadNeeded.wait(lock);
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}
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if (!m_stopped && !m_tasks.empty()) {
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task = m_tasks.front();
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m_tasks.pop();
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}
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}
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//Execute job
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if (task) {
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task->Run();
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}
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m_threadAvailable.notify_all();
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} while (!m_stopped);
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}
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void ThreadPool::Submit(boost::shared_ptr<Task> task)
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{
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boost::mutex::scoped_lock lock(m_mutex);
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if (m_stopping) {
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throw runtime_error("ThreadPool stopping - unable to accept new jobs");
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}
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while (m_queueLimit > 0 && m_tasks.size() >= m_queueLimit) {
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m_threadAvailable.wait(lock);
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}
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m_tasks.push(task);
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m_threadNeeded.notify_all();
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}
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void ThreadPool::Stop(bool processRemainingJobs)
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{
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{
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//prevent more jobs from being added to the queue
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boost::mutex::scoped_lock lock(m_mutex);
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if (m_stopped) return;
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m_stopping = true;
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}
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if (processRemainingJobs) {
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boost::mutex::scoped_lock lock(m_mutex);
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//wait for queue to drain.
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while (!m_tasks.empty() && !m_stopped) {
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m_threadAvailable.wait(lock);
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}
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}
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//tell all threads to stop
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{
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boost::mutex::scoped_lock lock(m_mutex);
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m_stopped = true;
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}
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m_threadNeeded.notify_all();
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m_threads.join_all();
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}
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}
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#endif //WITH_THREADS
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