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