scopedMutex.h

/* Copyright (c) 2006-2010, Stefan Eilemann <eile@equalizergraphics.com> 
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License version 2.1 as published
 * by the Free Software Foundation.
 *  
 * 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 this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef COBASE_SCOPEDMUTEX_H
#define COBASE_SCOPEDMUTEX_H

#include <co/base/lock.h>        // used in inline method
#include <co/base/lockable.h>    // used in inline method
#include <co/base/nonCopyable.h> // base class


namespace co
{
namespace base
{
    template< class L = Lock > class ScopedMutex : public NonCopyable
    {
    public:
        explicit ScopedMutex( L* lock ) : _lock( lock )
            { if( lock ) lock->set(); }

        explicit ScopedMutex( L& lock ) : _lock( &lock )
            { lock.set(); }

        template< typename LB > ScopedMutex( LB& lockable )
                : _lock( &lockable.lock ) { _lock->set(); }

        ~ScopedMutex() { leave(); }

        void leave() { if( _lock ) _lock->unset(); _lock = 0; }

    private:
        ScopedMutex() : _lock( 0 ) {}
        L* _lock;
    };
}
}
#endif //COBASE_SCOPEDMUTEX_H