jack2/windows/JackWinMutex.h

/*
 Copyright (C) 2004-2008 Grame

 This program 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 2.1 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 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

 */


#ifndef __JackWinMutex__
#define __JackWinMutex__

#include <windows.h>

namespace Jack
{
/*!
\brief Mutex abstraction.
*/
class JackBaseWinMutex
{

    protected:

        HANDLE fMutex;
        DWORD fOwner;

    public:

        JackBaseWinMutex():fOwner(0)
        {
            // In recursive mode by default
            fMutex = (HANDLE)CreateMutex(0, FALSE, 0);
            ThrowIf(fMutex == 0, JackException("JackWinMutex: could not init the mutex"));
        }

        virtual ~JackBaseWinMutex()
        {
            CloseHandle(fMutex);
        }

        bool Lock()
        {
            if (fOwner != GetCurrentThreadId()) {
                DWORD res = WaitForSingleObject(fMutex, INFINITE);
                if (res == WAIT_OBJECT_0) {
                    fOwner = GetCurrentThreadId();
                    return true;
                } else {
                    jack_log("JackWinMutex::Lock res = %d", res);
                    return false;
                }
            } else {
                jack_error("JackWinMutex::Lock mutex already locked by thread = %d", GetCurrentThreadId());
                return false;
            }
        }

        bool Trylock()
        {
            if (fOwner != GetCurrentThreadId()) {
                DWORD res = WaitForSingleObject(fMutex, 0);
                if (res == WAIT_OBJECT_0) {
                    fOwner = GetCurrentThreadId();
                    return true;
                } else {
                    jack_log("JackWinMutex::Trylock res = %d", res);
                    return false;
                }
            } else {
                jack_error("JackWinMutex::Trylock mutex already locked by thread = %d", GetCurrentThreadId());
                return false;
            }
        }

        bool Unlock()
        {
            if (fOwner == GetCurrentThreadId()) {
                fOwner = 0;
                int res = ReleaseMutex(fMutex);
                if (res != 0) {
                    return true;
                } else {
                    jack_log("JackWinMutex::Unlock res = %d", res);
                    return false;
                }
            } else {
                jack_error("JackWinMutex::Unlock mutex not locked by thread = %d", GetCurrentThreadId());
                return false;
            }
        }

};

class JackWinMutex
{

    protected:

        HANDLE fMutex;

    public:

        JackWinMutex()
        {
            // In recursive mode by default
            fMutex = (HANDLE)CreateMutex(0, FALSE, 0);
        }

        virtual ~JackWinMutex()
        {
            CloseHandle(fMutex);
        }

        bool Lock()
        {
            return (WAIT_OBJECT_0 == WaitForSingleObject(fMutex, INFINITE));
        }

        bool Trylock()
        {
            return (WAIT_OBJECT_0 == WaitForSingleObject(fMutex, 0));
        }

        bool Unlock()
        {
            return(ReleaseMutex(fMutex) != 0);
        }

};


} // namespace

#endif