//
// Copyright (C) 2013 LunarG, Inc.
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
//    Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
//    Redistributions in binary form must reproduce the above
//    copyright notice, this list of conditions and the following
//    disclaimer in the documentation and/or other materials provided
//    with the distribution.
//
//    Neither the name of 3Dlabs Inc. Ltd. nor the names of its
//    contributors may be used to endorse or promote products derived
//    from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
#ifndef WORKLIST_H_INCLUDED
#define WORKLIST_H_INCLUDED

#include "../glslang/OSDependent/osinclude.h"
#include <list>
#include <mutex>
#include <string>

namespace glslang {

    class TWorkItem {
    public:
        TWorkItem() { }
        explicit TWorkItem(const std::string& s) :
            name(s) { }
        std::string name;
        std::string results;
        std::string resultsIndex;
    };

    class TWorklist {
    public:
        TWorklist() { }
        virtual ~TWorklist() { }

        void add(TWorkItem* item)
        {
            std::lock_guard<std::mutex> guard(mutex);
            worklist.push_back(item);
        }

        bool remove(TWorkItem*& item)
        {
            std::lock_guard<std::mutex> guard(mutex);

            if (worklist.empty())
                return false;
            item = worklist.front();
            worklist.pop_front();

            return true;
        }

        int size()
        {
            return (int)worklist.size();
        }

        bool empty()
        {
            return worklist.empty();
        }

    protected:
        std::mutex mutex;
        std::list<TWorkItem*> worklist;
    };

} // end namespace glslang

#endif // WORKLIST_H_INCLUDED