00001 /*========================================================================= 00002 00003 Program: Open IGT Link Library 00004 Module: $HeadURL: http://svn.na-mic.org/NAMICSandBox/trunk/OpenIGTLink/Source/igtlConditionVariable.h $ 00005 Language: C++ 00006 Date: $Date: 2008-12-22 19:05:42 -0500 (Mon, 22 Dec 2008) $ 00007 Version: $Reivision$ 00008 00009 Copyright (c) Insight Software Consortium. All rights reserved. 00010 00011 This software is distributed WITHOUT ANY WARRANTY; without even 00012 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 00013 PURPOSE. See the above copyright notices for more information. 00014 00015 =========================================================================*/ 00016 /*========================================================================= 00017 00018 Program: Insight Segmentation & Registration Toolkit 00019 Module: $RCSfile: itkConditionVariable.h,v $ 00020 Language: C++ 00021 Date: $Date: 2008-12-22 19:05:42 -0500 (Mon, 22 Dec 2008) $ 00022 Version: $Revision: 3460 $ 00023 00024 Copyright (c) Insight Software Consortium. All rights reserved. 00025 See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. 00026 00027 This software is distributed WITHOUT ANY WARRANTY; without even 00028 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 00029 PURPOSE. See the above copyright notices for more information. 00030 00031 =========================================================================*/ 00032 #ifndef __igtlConditionVariable_h 00033 #define __igtlConditionVariable_h 00034 00035 #include "igtlConfigure.h" 00036 00037 // This implementation uses a routine called SignalObjectAndWait() 00038 // which is only defined on WinNT 4.0 or greater systems. We need to 00039 // define this symbol in order to get the prototype for the 00040 // routine. This needs to be done before we load any system headers. 00041 #ifdef OpenIGTLink_USE_WIN32_THREADS 00042 #undef _WIN32_WINNT 00043 #define _WIN32_WINNT 0x0400 00044 #include "igtlWindows.h" 00045 #endif 00046 00047 00048 #include "igtlMutexLock.h" 00049 #include "igtlLightObject.h" 00050 00051 00052 namespace igtl { 00053 00084 class IGTLCommon_EXPORT ConditionVariable : public LightObject 00085 { 00086 public: 00088 typedef ConditionVariable Self; 00089 typedef LightObject Superclass; 00090 typedef SmartPointer<Self> Pointer; 00091 typedef SmartPointer<const Self> ConstPointer; 00092 00094 igtlNewMacro(Self); 00095 00097 igtlTypeMacro(ConditionVariable, LightObject); 00098 00102 void Wait(SimpleMutexLock * mutex); 00103 00105 void Signal(); 00106 00108 void Broadcast(); 00109 00110 protected: 00111 ConditionVariable(); 00112 ~ConditionVariable(); 00113 00114 private: 00115 ConditionVariable(const Self & other); 00116 const Self & operator=( const Self & ); 00117 #ifdef OpenIGTLink_USE_PTHREADS 00118 pthread_cond_t m_ConditionVariable; 00119 MutexType m_Mutex; 00120 #else 00121 int m_NumberOfWaiters; // number of waiting threads 00122 #ifdef WIN32 00123 CRITICAL_SECTION m_NumberOfWaitersLock; // Serialize access to 00124 // m_NumberOfWaiters 00125 00126 HANDLE m_Semaphore; // Semaphore to queue threads 00127 HANDLE m_WaitersAreDone; // Auto-reset event used by the 00128 // broadcast/signal thread to 00129 // wait for all the waiting 00130 // threads to wake up and 00131 // release the semaphore 00132 00133 size_t m_WasBroadcast; // Keeps track of whether we 00134 // were broadcasting or signaling 00135 #endif 00136 #endif 00137 }; 00138 00139 } // end namespace igtl 00140 00141 #endif 00142