RecursiveMutex.hxx

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/*
 * Copyright (c) 2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU 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 __RECURSIVEMUTEX__
#define __RECURSIVEMUTEX__

#include <pthread.h>
#include "Lock.hxx"

namespace CLAM
{

        struct xtime;

        class RecursiveMutex
        {
        public:
                
                friend class Hidden::LockOps<RecursiveMutex>;

                typedef Hidden::LockOps<RecursiveMutex> LockOps;
                typedef Hidden::ScopedLock<RecursiveMutex> ScopedLock;

                RecursiveMutex();

                ~RecursiveMutex();

        public:
                struct ConditionVar
                {
                        long count;
                        pthread_mutex_t* pmutex;
                };
        private:
                void DoLock();
                void DoUnlock();
                void DoLock( ConditionVar& state );
                void DoUnlock( ConditionVar& state );

                pthread_mutex_t mMutex;
                unsigned mCount;
                pthread_cond_t mUnlocked;
                pthread_t      mThreadID;
                bool           mValidID;
        };

        class RecursiveTryMutex
        {
        public:
                friend class Hidden::LockOps<RecursiveTryMutex>;

                typedef Hidden::ScopedLock<RecursiveTryMutex> ScopedLock;
                typedef Hidden::ScopedTryLock<RecursiveTryMutex> ScopedTryLock;

                RecursiveTryMutex();

                ~RecursiveTryMutex();

        private:
                struct ConditionVar
                {
                        long count;
                        pthread_mutex_t* pmutex;
                };

                void DoLock();
                bool DoTryLock();
                void DoUnlock();
                void DoLock( ConditionVar& state );
                void DoUnlock( ConditionVar& state );

                pthread_mutex_t mMutex;
                unsigned mCount;
                pthread_cond_t mUnlocked;
                pthread_t      mThreadID;
                bool           mValidID;
        };

        class RecursiveTimedMutex
        {
        public:
                friend class Hidden::LockOps<RecursiveTimedMutex>;

                typedef Hidden::ScopedLock<RecursiveTimedMutex> ScopedLock;
                typedef Hidden::ScopedTryLock<RecursiveTimedMutex> ScopedTryLock;
                typedef Hidden::ScopedTimedLock<RecursiveTimedMutex> ScopedTimedLock;

                RecursiveTimedMutex();

                ~RecursiveTimedMutex();

        private:
                struct ConditionVar
                {
                        long count;
                        pthread_mutex_t* pmutex;
                };

                void DoLock();
                bool DoTryLock();
                bool DoTimedLock( const xtime& xt );
                void DoUnlock();
                void DoLock( ConditionVar& state );
                void DoUnlock( ConditionVar& state );

                pthread_mutex_t mMutex;
                unsigned mCount;
                pthread_cond_t mUnlocked;
                pthread_t      mThreadID;
                bool           mValidID;
        };

} // namespace CLAM


#endif // RecursiveMutex.hxx