/home/pete/Work/TSE3.svn/tse3/src/tse3/Mutex.h

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/*
 * @(#)Mutex.h 3.00 2 October 2000
 *
 * Copyright (c) 2000 Pete Goodliffe (pete@cthree.org)
 *
 * This file is part of TSE3 - the Trax Sequencer Engine version 3.00.
 *
 * This library is modifiable/redistributable under the terms of the GNU
 * General Public License.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING. If not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */

#ifndef TSE3_MUTEX_H
#define TSE3_MUTEX_H

namespace TSE3
{
    namespace Impl
    {
        class MutexImpl
        {
            public:

                virtual ~MutexImpl() {}

                virtual void lock() = 0;

                virtual void unlock() = 0;

                virtual bool locked() = 0;
        };

        class NullMutexImpl : public MutexImpl
        {
            public:

                NullMutexImpl() : _locked(0) {}

                virtual ~NullMutexImpl() {}

                virtual void lock() { ++_locked; }

                virtual void unlock() { if (_locked) --_locked; }

                virtual bool locked() { return _locked; }

            private:

                int _locked;
        };

        class Mutex
        {
            public:

                Mutex(MutexImpl *i) : impl(i) {}

                ~Mutex();

                static void setImpl(MutexImpl *impl);

                static Mutex *mutex();

                void lock()
                {
#ifndef TSE3_WITHOUT_MUTEX
                    impl->lock();
#endif
                }

                void unlock()
                {
#ifndef TSE3_WITHOUT_MUTEX
                    impl->unlock();
#endif
                }

            private:

                MutexImpl        *impl;

                static MutexImpl *globalImpl;
        };

        class CritSec
        {
            public:

                CritSec()
                {
#ifndef TSE3_WITHOUT_MUTEX
                    Mutex::mutex()->lock();
#endif
                }

                ~CritSec()
                {
#ifndef TSE3_WITHOUT_MUTEX
                    Mutex::mutex()->unlock();
#endif
                }
        };
    };
}

#endif

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