/*=========================================================================

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkMutexLock.cxx,v $

  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.

=========================================================================*/
#include "vtkMutexLock.h"
#include "vtkObjectFactory.h"

vtkCxxRevisionMacro(vtkMutexLock, "$Revision: 1.22 $");
vtkStandardNewMacro(vtkMutexLock);

// New for the SimpleMutex
vtkSimpleMutexLock *vtkSimpleMutexLock::New()
{
  return new vtkSimpleMutexLock;
}

// Construct a new vtkMutexLock 
vtkSimpleMutexLock::vtkSimpleMutexLock()
{
#ifdef VTK_USE_SPROC
  init_lock( &this->MutexLock );
#endif

#ifdef VTK_USE_WIN32_THREADS
  this->MutexLock = CreateMutex( NULL, FALSE, NULL ); 
#endif

#ifdef VTK_USE_PTHREADS
#ifdef VTK_HP_PTHREADS
  pthread_mutex_init(&(this->MutexLock), pthread_mutexattr_default);
#else
  pthread_mutex_init(&(this->MutexLock), NULL);
#endif
#endif

}

// Destruct the vtkMutexVariable
vtkSimpleMutexLock::~vtkSimpleMutexLock()
{
#ifdef VTK_USE_WIN32_THREADS
  CloseHandle(this->MutexLock);
#endif

#ifdef VTK_USE_PTHREADS
  pthread_mutex_destroy( &this->MutexLock);
#endif
}

// Lock the vtkMutexLock
void vtkSimpleMutexLock::Lock()
{
#ifdef VTK_USE_SPROC
  spin_lock( &this->MutexLock );
#endif

#ifdef VTK_USE_WIN32_THREADS
  WaitForSingleObject( this->MutexLock, INFINITE );
#endif

#ifdef VTK_USE_PTHREADS
  pthread_mutex_lock( &this->MutexLock);
#endif
}

// Unlock the vtkMutexLock
void vtkSimpleMutexLock::Unlock()
{
#ifdef VTK_USE_SPROC
  release_lock( &this->MutexLock );
#endif

#ifdef VTK_USE_WIN32_THREADS
  ReleaseMutex( this->MutexLock );
#endif

#ifdef VTK_USE_PTHREADS
  pthread_mutex_unlock( &this->MutexLock);
#endif
}

int vtkSimpleMutexLock::IsA(const char *type)
{
  if ( !strcmp(this->vtkSimpleMutexLock::GetClassName(),type) )
    {
    return 1;
    }
  return 0;
}

vtkSimpleMutexLock *vtkSimpleMutexLock::SafeDownCast(vtkSimpleMutexLock *o)
{
  return (vtkSimpleMutexLock *)o;
}
  
void vtkMutexLock::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);
}