/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * 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 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGDB_REENTRANTMUTEX
#define OSGDB_REENTRANTMUTEX

#include <OpenThreads/Thread>
#include <OpenThreads/Mutex>

#include <osgDB/Export>

namespace osgDB {

class OSGDB_EXPORT ReentrantMutex : public OpenThreads::Mutex
{
    public:

        ReentrantMutex();

        virtual ~ReentrantMutex();

        virtual int lock();

        virtual int unlock();

        virtual int trylock();

    private:

        ReentrantMutex(const ReentrantMutex &):OpenThreads::Mutex() {}

        ReentrantMutex &operator=(const ReentrantMutex &) {return *(this);}
        
        OpenThreads::Thread* _threadHoldingMutex;
        unsigned int         _lockCount;

};

}

#endif
