acedia/context.hpp

/*                                                                            *\
**                          Copyright (C) 2009-2010                           **
**       Dominik Charousset < Dominik.Charousset (at) haw-hamburg.de >        **
**                                                                            **
**            MMM       MMMMMM   MMMMMMMMM MMMMMMM   MMM       MMM            **
**           MMMMM     MMMMMMMM  MMMMMMMMM MMMMMMMM  MMM      MMMMM           **
**          MMM MMM   MMM        MMMM      MMM   MMM MMM     MMM MMM          **
**         MMM   MMM  MMM        MMMMMMMMM MMM   MMM MMM    MMM   MMM         **
**        MMMMMMMMMMM MMMM   MMM MMMM      MMM   MMM MMM   MMMMMMMMMMM        **
**       MMM       MMM MMMMMMMM  MMMMMMMMM MMMMMMMM  MMM  MMM       MMM       **
**      MMM         MMM MMMMMM   MMMMMMMMM MMMMMMM   MMM MMM         MMM      **
**                                                                            **
**                                                                            **
** This file is part of the acedia library.                                   **
**                                                                            **
** This library is free software: you can redistribute it and/or modify       **
** it under the terms of the GNU Lesser General Public License as published   **
** by the Free Software Foundation, either version 3 of the License, or       **
** (at your option) any later version.                                        **
**                                                                            **
** This library 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 Lesser General Public License for more details.                        **
**                                                                            **
** You should have received a copy of the GNU Lesser General Public License   **
** along with acedia. If not, see <http://www.gnu.org/licenses/>.             **
\*                                                                            */

#ifndef ACEDIA_CONTEXT_H
#define ACEDIA_CONTEXT_H

#ifndef _XOPEN_SOURCE
    #define _XOPEN_SOURCE
#endif

#include "acedia_config.hpp"

#if defined (ACEDIA_MACOS) || defined (ACEDIA_LINUX)
#    define ACEDIA_UCONTEXT_IMPL
#elif defined (ACEDIA_WINDOWS)
#    define ACEDIA_FIBER_IMPL
#endif

#ifdef ACEDIA_UCONTEXT_IMPL

/*****************************************************************************
 *                            UNIX implementation                            *
 *****************************************************************************/

#include <ucontext.h>
#include <sys/mman.h>
#include <signal.h>
#include <cstddef>

namespace acedia
{
    static const std::size_t STACK_SIZE = SIGSTKSZ;

    class Context
    {

        ucontext_t ctx;
        void *stack;

        void init();

    public:

        Context(void (*func)(void), int arg1);
        ~Context();
        Context() throw();

        inline static void swap(Context &from, Context &to)
        {
            swapcontext(&(from.ctx), &(to.ctx));
        }

    };

} // namespace acedia

#elif defined(ACEDIA_FIBER_IMPL)

/*****************************************************************************
 *                           Fibers implementation                           *
 *****************************************************************************/

#include <Winsock2.h>
#include <Windows.h>

namespace acedia
{
    class Context
    {
        
        LPVOID fiber;
        // true if this fiber was created with ConvertThreadToFiber
        bool isConvertedThread;

        void init();

    public:

        Context(LPFIBER_START_ROUTINE func, LPVOID arg1);
        ~Context();
        Context();

        inline static void swap(Context &, Context &to)
        {
            SwitchToFiber(to.fiber);
        }

    };
}

#endif

#endif // ACEDIA_CONTEXT_H

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