ThreadPool.h

// This file is a part of the OpenSurgSim project.
// Copyright 2013, SimQuest Solutions Inc.
//
// 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.

#ifndef SURGSIM_FRAMEWORK_THREADPOOL_H
#define SURGSIM_FRAMEWORK_THREADPOOL_H

#include <atomic>
#include <boost/thread.hpp>
#include <functional>
#include <future>
#include <list>
#include <memory>
#include <queue>


namespace SurgSim
{
namespace Framework
{

class ThreadPool
{
public:
    explicit ThreadPool(size_t numThreads = boost::thread::hardware_concurrency());

    ~ThreadPool();

    template <class R>
    std::future<R> enqueue(std::function<R()> function);

private:
    ThreadPool(const ThreadPool& other);
    ThreadPool& operator=(const ThreadPool& other);

    class TaskBase;

    template<class R>
    class Task;

    std::list<boost::thread> m_threads;

    std::queue<std::unique_ptr<TaskBase>> m_tasks;

    boost::mutex m_mutex;

    boost::condition_variable m_threadSignaler;

    std::atomic<bool> m_destructing;
};

};
};

#include "SurgSim/Framework/ThreadPool-inl.h"

#endif //SURGSIM_FRAMEWORK_THREADPOOL_H