monopoly.h

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// The DAGFrameScheduler is a Multi-Threaded lock free and wait free scheduling library.
// © Copyright 2010 - 2016 BlackTopp Studios Inc.
/* This file is part of The DAGFrameScheduler.

    The DAGFrameScheduler 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 3 of the License, or
    (at your option) any later version.

    The DAGFrameScheduler is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with The DAGFrameScheduler.  If not, see <http://www.gnu.org/licenses/>.
*/
/* The original authors have included a copy of the license specified above in the
   'doc' folder. See 'gpl.txt'
*/
/* We welcome the use of the DAGFrameScheduler to anyone, including companies who wish to
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   However there are some practical restrictions, so if your project involves
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   Joseph Toppi - toppij@gmail.com
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*/
#ifndef _threadmonopoly_h
#define _threadmonopoly_h

#include "datatypes.h"

#if !defined(SWIG) || defined(SWIG_THREADING) // Do not read when in swig and not in the threading module
#include "doublebufferedresource.h"
#include "workunit.h"
#endif

/// @file
/// @brief Contains an interface for a kind of WorkUnit that consumes time on multiple thread

namespace Mezzanine
{
    namespace Threading
    {
        class FrameScheduler;

        /// @brief A kind of workunit given exclusive runtime so it can consume time on multiple threads
        /// @details A @ref FrameScheduler executes monopolies before other and will allow them to run with on every thread.
        class MEZZ_LIB MonopolyWorkUnit : public DefaultWorkUnit
        {
            public:
                /// @brief Provides a hint to the monopoly as to how many threads it should use.
                /// @param AmountToUse The amount of threads you would like the monopoly to consume.
                virtual void UseThreads(const Whole& AmountToUse) = 0;

                /// @brief Retrieves the amount of threads that the monopoly will actually use.
                /// @details The monopoly is free to ignore any value passed @ref UseThreads and
                /// use any heuristic or threading model instead.
                /// @return A whole with the amount of threads to be used.
                virtual Whole UsingThreadCount() = 0;

                /// @brief A virtual destructor, currently empty.
                virtual ~MonopolyWorkUnit();
        };//MonopolyWorkUnit
    }//Threading
}//Mezzanine
#endif