/* -*-c++-*- OpenThreads - Copyright (C) 1998-2007 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 _OPENTHREADS_BLOCK_
#define _OPENTHREADS_BLOCK_

#include <OpenThreads/Thread>
#include <OpenThreads/Barrier>
#include <OpenThreads/Condition>
#include <OpenThreads/ScopedLock>

namespace OpenThreads {

class Block 
{
    public:
    
        Block():
            _released(false) {}

        ~Block()
        {
            release();
        }

        inline bool block()
        {
            ScopedLock<OpenThreads::Mutex> mutlock(_mut);
            if( !_released )
            {
                return _cond.wait(&_mut)==0;
            }
            else
            {
                return true;
            }
        }

        inline bool block(unsigned long timeout)
        {
            ScopedLock<OpenThreads::Mutex> mutlock(_mut);
            if( !_released )
            {
                return _cond.wait(&_mut, timeout)==0;
            }
            else
            {
                return true;
            }
        }

        inline void release()
        {
            ScopedLock<OpenThreads::Mutex> mutlock(_mut);
            if (!_released)
            {
                _released = true;
                _cond.broadcast();
            }
        }

        inline void reset()
        {
            ScopedLock<OpenThreads::Mutex> mutlock(_mut);
            _released = false;
        }
        
        inline void set(bool doRelease)
        {
            if (doRelease!=_released)
            {
                if (doRelease) release();
                else reset();
            }
        }

    protected:

        Mutex _mut;
        Condition _cond;
        bool _released;
};

}

#endif