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/*=========================================================================
Program: Visualization Toolkit
Module: vtkThreadMessager.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.
=========================================================================*/
// .NAME vtkThreadMessager - A class for performing inter-thread messaging
// .SECTION Description
// vtkMultithreader is a class that provides support for messaging between
// threads multithreaded using pthreads or Windows messaging.
#ifndef vtkThreadMessager_h
#define vtkThreadMessager_h
#include "vtkCommonSystemModule.h" // For export macro
#include "vtkObject.h"
#if defined(VTK_USE_PTHREADS) || defined(VTK_HP_PTHREADS)
#include <pthread.h> // Needed for pthread types
#endif
class VTKCOMMONSYSTEM_EXPORT vtkThreadMessager : public vtkObject
{
public:
static vtkThreadMessager *New();
vtkTypeMacro(vtkThreadMessager,vtkObject);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Wait (block, non-busy) until another thread sends a
// message.
void WaitForMessage();
// Description:
// Send a message to all threads who are waiting via
// WaitForMessage().
void SendWakeMessage();
// Description:
// pthreads only. If the wait is enabled, the thread who
// is to call WaitForMessage() will block until a receiver
// thread is ready to receive.
void EnableWaitForReceiver();
// Description:
// pthreads only. If the wait is enabled, the thread who
// is to call WaitForMessage() will block until a receiver
// thread is ready to receive.
void DisableWaitForReceiver();
// Description:
// pthreads only.
// If wait is enable, this will block until one thread is ready
// to receive a message.
void WaitForReceiver();
protected:
vtkThreadMessager();
~vtkThreadMessager();
#ifdef VTK_USE_PTHREADS
pthread_mutex_t Mutex;
pthread_cond_t PSignal;
#endif
#ifdef VTK_USE_WIN32_THREADS
vtkWindowsHANDLE WSignal;
#endif
private:
vtkThreadMessager(const vtkThreadMessager&); // Not implemented.
void operator=(const vtkThreadMessager&); // Not implemented.
};
#endif
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