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
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