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138 lines
3.7 KiB
138 lines
3.7 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkCriticalSection.h,v $
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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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// .NAME vtkCriticalSection - critical section locking class
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// .SECTION Description
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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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#ifndef __vtkCriticalSection_h
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#define __vtkCriticalSection_h
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#include "vtkObject.h"
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//BTX
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#ifdef VTK_USE_SPROC
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#include <abi_mutex.h> // Needed for sproc implementation of mutex
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typedef abilock_t vtkCritSecType;
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#endif
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#if defined(VTK_USE_PTHREADS) || defined(VTK_HP_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_SPROC
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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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#endif
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// Critical Section object that is not a vtkObject.
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class VTK_COMMON_EXPORT vtkSimpleCriticalSection
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{
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public:
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vtkSimpleCriticalSection()
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{
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this->Init();
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}
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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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void Init();
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virtual ~vtkSimpleCriticalSection();
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static vtkSimpleCriticalSection *New();
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void Delete() {delete this;}
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// Description:
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// Lock the vtkCriticalSection
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void Lock( void );
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// Description:
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// Unlock the vtkCriticalSection
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void Unlock( void );
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protected:
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vtkCritSecType CritSec;
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};
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//ETX
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class VTK_COMMON_EXPORT vtkCriticalSection : public vtkObject
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{
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public:
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static vtkCriticalSection *New();
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vtkTypeRevisionMacro(vtkCriticalSection,vtkObject);
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void PrintSelf(ostream& os, vtkIndent indent);
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// Description:
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// Lock the vtkCriticalSection
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void Lock( void );
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// Description:
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// Unlock the vtkCriticalSection
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void Unlock( void );
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protected:
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vtkSimpleCriticalSection SimpleCriticalSection;
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vtkCriticalSection() {};
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private:
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vtkCriticalSection(const vtkCriticalSection&); // Not implemented.
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void operator=(const vtkCriticalSection&); // Not implemented.
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};
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inline void vtkCriticalSection::Lock( void )
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{
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this->SimpleCriticalSection.Lock();
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}
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inline void vtkCriticalSection::Unlock( void )
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{
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this->SimpleCriticalSection.Unlock();
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}
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#endif
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