ThreadSafeQueue.h

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// -*- mode: c++; indent-tabs-mode: nil; c-basic-offset: 4; coding: iso-8859-1; -*-

/*
ACT-CV - Machine Vision for Cognitive Modeling
Copyright (c) 2008 Marc Halbruegge

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#ifndef __THREADSAFEQUEUE_H
#define __THREADSAFEQUEUE_H

//namespace mhthreads {
    
#include <queue>
#include <mutex>

template<typename _t>
class ThreadSafeQueue : protected std::queue<_t> {
protected:
   std::mutex mutex_;
public:
    ThreadSafeQueue() {
    }
    ThreadSafeQueue(const ThreadSafeQueue &q) : std::queue<_t>(q) {
    }
    ~ThreadSafeQueue() {
    }
    void EnterCriticalSection() {
        mutex_.lock();
    }
    void LeaveCriticalSection() {
        mutex_.unlock();
    }

    void push(const _t& x) {
        std::lock_guard<std::mutex> lock(mutex_);
        std::queue<_t>::push(x);
    }
    _t pop() {
        std::lock_guard<std::mutex> lock(mutex_);
        _t result = std::queue<_t>::front();
        std::queue<_t>::pop();
        return result;
    }
    bool empty() {
        std::lock_guard<std::mutex> lock(mutex_);
        return std::queue<_t>::empty();
    }

};


template<class _t>
class ThreadSafePointerQueue : public ThreadSafeQueue<_t*> {
public:
    _t* front() {
        return std::queue<_t*>::front();
    }
    unsigned int size() {
        std::lock_guard<std::mutex> lock(this->mutex_);
        unsigned int result=std::queue<_t*>::size();
        return result;
    }
};


#endif