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98 lines
3.0 KiB
C++
98 lines
3.0 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkCriticalSection.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkSimpleCriticalSection
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* @brief Critical section locking class
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*
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* vtkCriticalSection allows the locking of variables which are accessed
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* through different threads. This header file also defines
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* vtkSimpleCriticalSection which is not a subclass of vtkObject.
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* The API is identical to that of vtkMutexLock, and the behavior is
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* identical as well, except on Windows 9x/NT platforms. The only difference
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* on these platforms is that vtkMutexLock is more flexible, in that
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* it works across processes as well as across threads, but also costs
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* more, in that it evokes a 600-cycle x86 ring transition. The
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* vtkCriticalSection provides a higher-performance equivalent (on
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* Windows) but won't work across processes. Since it is unclear how,
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* in vtk, an object at the vtk level can be shared across processes
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* in the first place, one should use vtkCriticalSection unless one has
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* a very good reason to use vtkMutexLock. If higher-performance equivalents
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* for non-Windows platforms (Irix, SunOS, etc) are discovered, they
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* should replace the implementations in this class
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*/
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#ifndef vtkSimpleCriticalSection_h
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#define vtkSimpleCriticalSection_h
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#include "vtkCommonCoreModule.h" // For export macro
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#include "vtkSystemIncludes.h"
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#if defined(VTK_USE_PTHREADS)
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#include <pthread.h> // Needed for pthreads implementation of mutex
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typedef pthread_mutex_t vtkCritSecType;
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#endif
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#ifdef VTK_USE_WIN32_THREADS
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#include "vtkWindows.h" // Needed for win32 implementation of mutex
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typedef CRITICAL_SECTION vtkCritSecType;
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#endif
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#ifndef VTK_USE_PTHREADS
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#ifndef VTK_USE_WIN32_THREADS
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typedef int vtkCritSecType;
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#endif
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#endif
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// Critical Section object that is not a vtkObject.
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class VTKCOMMONCORE_EXPORT vtkSimpleCriticalSection
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{
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public:
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// Default cstor
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vtkSimpleCriticalSection() { this->Init(); }
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// Construct object locked if isLocked is different from 0
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vtkSimpleCriticalSection(int isLocked)
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{
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this->Init();
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if (isLocked)
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{
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this->Lock();
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}
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}
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// Destructor
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virtual ~vtkSimpleCriticalSection();
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void Init();
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/**
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* Lock the vtkCriticalSection
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*/
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void Lock();
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/**
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* Unlock the vtkCriticalSection
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*/
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void Unlock();
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protected:
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vtkCritSecType CritSec;
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private:
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vtkSimpleCriticalSection(const vtkSimpleCriticalSection& other) = delete;
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vtkSimpleCriticalSection& operator=(const vtkSimpleCriticalSection& rhs) = delete;
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};
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#endif
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// VTK-HeaderTest-Exclude: vtkSimpleCriticalSection.h
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