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igtlConditionVariable.h
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1/*=========================================================================
2
3 Program: The OpenIGTLink Library
4 Language: C++
5 Web page: http://openigtlink.org/
6
7 Copyright (c) Insight Software Consortium. All rights reserved.
8
9 This software is distributed WITHOUT ANY WARRANTY; without even
10 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
11 PURPOSE. See the above copyright notices for more information.
12
13=========================================================================*/
14/*=========================================================================
15
16 Program: Insight Segmentation & Registration Toolkit
17 Module: $RCSfile: itkConditionVariable.h,v $
18 Language: C++
19 Date: $Date: 2008-12-22 19:05:42 -0500 (Mon, 22 Dec 2008) $
20 Version: $Revision: 3460 $
21
22 Copyright (c) Insight Software Consortium. All rights reserved.
23 See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
24
25 This software is distributed WITHOUT ANY WARRANTY; without even
26 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
27 PURPOSE. See the above copyright notices for more information.
28
29=========================================================================*/
30#ifndef __igtlConditionVariable_h
31#define __igtlConditionVariable_h
32
33#include "igtlConfigure.h"
34
35// This implementation uses a routine called SignalObjectAndWait()
36// which is only defined on WinNT 4.0 or greater systems. We need to
37// define this symbol in order to get the prototype for the
38// routine. This needs to be done before we load any system headers.
39#ifdef OpenIGTLink_USE_WIN32_THREADS
40#undef _WIN32_WINNT
41#define _WIN32_WINNT 0x0400
42#include "igtlWindows.h"
43#endif
44
45
46#include "igtlMutexLock.h"
47#include "igtlLightObject.h"
48
49
50namespace igtl {
51
83{
84public:
90
93
96
100 void Wait(SimpleMutexLock * mutex);
101
103 void Signal();
104
106 void Broadcast();
107
108protected:
111
112private:
113 ConditionVariable(const Self & other);
114 const Self & operator=( const Self & );
115#ifdef OpenIGTLink_USE_PTHREADS
116 pthread_cond_t m_ConditionVariable;
117 MutexType m_Mutex;
118#else
119 int m_NumberOfWaiters; // number of waiting threads
120#ifdef WIN32
121 CRITICAL_SECTION m_NumberOfWaitersLock; // Serialize access to
122 // m_NumberOfWaiters
123
124 HANDLE m_Semaphore; // Semaphore to queue threads
125 HANDLE m_WaitersAreDone; // Auto-reset event used by the
126 // broadcast/signal thread to
127 // wait for all the waiting
128 // threads to wake up and
129 // release the semaphore
130
131 size_t m_WasBroadcast; // Keeps track of whether we
132 // were broadcasting or signaling
133#endif
134#endif
135};
136
137} // end namespace igtl
138
139#endif
A thread synchronization object used to suspend execution until some condition on shared data is met.
igtlTypeMacro(ConditionVariable, LightObject)
SmartPointer< const Self > ConstPointer
void Wait(SimpleMutexLock *mutex)
SmartPointer< Self > Pointer
Light weight base class for most igtl classes.
Simple mutual exclusion locking class.
Implements transparent reference counting.
#define IGTLCommon_EXPORT
The "igtl" namespace contains all OpenIGTLink classes. There are several nested namespaces within the...
int MutexType

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