You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
3 weeks ago
|
/*=========================================================================
|
||
|
|
|
||
|
|
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"
|
||
|
|
|
||
|
|
#if defined(VTK_USE_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_PTHREADS
|
||
|
|
#ifndef VTK_USE_WIN32_THREADS
|
||
|
|
typedef int vtkCritSecType;
|
||
|
|
#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) = delete;
|
||
|
|
vtkSimpleCriticalSection& operator=(const vtkSimpleCriticalSection& rhs) = delete;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|
||
|
|
// VTK-HeaderTest-Exclude: vtkSimpleCriticalSection.h
|