csutil/threading/barrier.h Source File (Crystal Space 2.0 Public API Reference)

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csutil/threading/barrier.h

    00001 /*
    00002   Copyright (C) 2007 by Marten Svanfeldt
    00003
    00004   This library is free software; you can redistribute it and/or
    00005   modify it under the terms of the GNU Lesser General Public
    00006   License as published by the Free Software Foundation; either
    00007   version 2 of the License, or (at your option) any later version.
    00008
    00009   This library is distributed in the hope that it will be useful,
    00010   but WITHOUT ANY WARRANTY; without even the implied warranty of
    00011   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00012   Library General Public License for more details.
    00013
    00014   You should have received a copy of the GNU Library General Public
    00015   License along with this library; if not, write to the Free
    00016   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    00017 */
    00018
    00019 #ifndef __CS_CSUTIL_THREADING_BARRIER_H__
    00020 #define __CS_CSUTIL_THREADING_BARRIER_H__
    00021
    00022 #include "csutil/noncopyable.h"
    00023 #include "csutil/threading/condition.h"
    00024 #include "csutil/threading/mutex.h"
    00025
    00026 namespace CS
    00027 {
    00028 namespace Threading
    00029 {
    00030
    00037   class Barrier : private CS::NonCopyable
    00038   {
    00039   public:
    00043     Barrier (size_t maxCount)
    00044       : maxCount (maxCount), currentCount (0)
    00045     {}
    00046
    00051     void Reset ()
    00052     {
    00053       currentCount = 0;
    00054     }
    00055
    00060     bool Wait ()
    00061     {
    00062       MutexScopedLock lock (mutex);
    00063       if (++currentCount < maxCount)
    00064       {
    00065         while (currentCount < maxCount)
    00066           condition.Wait (mutex);
    00067
    00068         return false;
    00069       }
    00070       else
    00071       {
    00072         condition.NotifyAll ();
    00073         return true;
    00074       }
    00075     }
    00076
    00077   private:
    00078     Mutex mutex;
    00079     Condition condition;
    00080
    00081     const size_t maxCount;
    00082     volatile size_t currentCount;
    00083   };
    00084
    00085 }
    00086 }
    00087
    00088 #endif