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itkConditionVariable.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkConditionVariable.h,v $
00005   Language:  C++
00006   Date:      $Date: 2003/09/10 14:29:04 $
00007   Version:   $Revision: 1.7 $
00008 
00009   Copyright (c) Insight Software Consortium. All rights reserved.
00010   See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
00011 
00012      This software is distributed WITHOUT ANY WARRANTY; without even 
00013      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
00014      PURPOSE.  See the above copyright notices for more information.
00015 
00016 =========================================================================*/
00017 #ifndef  _itkConditionVariable_h_
00018 #define  _itkConditionVariable_h_
00019 
00020 #include "itkConfigure.h"
00021 
00022 // This implementation uses a routine called SignalObjectAndWait()
00023 // which is only defined on WinNT 4.0 or greater systems.  We need to
00024 // define this symbol in order to get the prototype for the
00025 // routine. This needs to be done before we load any system headers.
00026 #ifdef ITK_USE_WIN32_THREADS
00027 #define _WIN32_WINNT 0x0400
00028 #endif
00029 
00030 #include "itkMutexLock.h"
00031 #include "itkLightObject.h"
00032 
00033 
00034 namespace itk {
00035 
00066 class ITKCommon_EXPORT ConditionVariable : public LightObject
00067 {
00068 public:
00070   typedef ConditionVariable Self;
00071   typedef LightObject Superclass;
00072   typedef SmartPointer<Self> Pointer;
00073   typedef SmartPointer<const Self> ConstPointer;
00074   
00076   itkNewMacro(Self);
00077   
00079   itkTypeMacro(ConditionVariable, LightObject);
00080 
00084   void Wait(SimpleMutexLock * mutex);
00085 
00087   void Signal();
00088 
00090   void Broadcast();
00091 
00092 protected:
00093   ConditionVariable();
00094   ~ConditionVariable();
00095 
00096 private:
00097   ConditionVariable(const Self & other);
00098   const Self & operator=( const Self & );
00099 #ifdef ITK_USE_PTHREADS
00100   pthread_cond_t m_ConditionVariable;
00101   MutexType m_Mutex;
00102 #else
00103   int m_NumberOfWaiters;                   // number of waiting threads
00104 #ifdef WIN32
00105   CRITICAL_SECTION m_NumberOfWaitersLock;  // Serialize access to m_NumberOfWaiters
00106 
00107   HANDLE m_Semaphore;                      // Semaphore to queue threads 
00108   HANDLE m_WaitersAreDone;                 // Auto-reset event used by the
00109                                            // broadcast/signal thread to
00110                                            // wait for all the waiting
00111                                            // threads to wake up and
00112                                            // release the semaphore
00113 
00114   size_t m_WasBroadcast;                   // Keeps track of whether we
00115                                            // were broadcasting or signaling
00116 #endif
00117 #endif
00118 };
00119 
00120 }//end of itk namespace
00121 
00122 #endif

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