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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkConditionVariableTest.cxx,v $
  Language:  C++
  Date:      $Date: 2003/09/10 14:30:08 $
  Version:   $Revision: 1.4 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/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 notices for more information.

=========================================================================*/
#if defined(_MSC_VER)
#pragma warning ( disable : 4786 )
#endif

#include <iostream>
#include "itkConditionVariable.h"
#include "itkMultiThreader.h"
#include "itkMutexLock.h"

class ConditionVariableTestUserData
{
public:
  itk::SimpleMutexLock m_Mutex;
  itk::ConditionVariable::Pointer m_ConditionVariable;
  unsigned int m_Counter;
  unsigned int m_CountLimit;
  
  ConditionVariableTestUserData()
  {
    m_ConditionVariable = itk::ConditionVariable::New();
    m_Counter = 0;
    m_CountLimit = 12;
  }
  ~ConditionVariableTestUserData() {}
};


ITK_THREAD_RETURN_TYPE ConditionVariableTestIncCount( void *ptr )
{
  ConditionVariableTestUserData *data = static_cast<ConditionVariableTestUserData *>(
                       ( (itk::MultiThreader::ThreadInfoStruct *)(ptr) )->UserData );

  double v = 400.0;

  for (unsigned i = 0; i < 10; i++)
    {
    data->m_Mutex.Lock();
    data->m_Counter++;
    // Check the value of count.  If the condition has been reached, signal
    // waiting threads.
    if (data->m_Counter == data->m_CountLimit)
      {
      //      data->m_ConditionVariable->Signal();
      // Tests both Broadcast and Signal
      data->m_ConditionVariable->Broadcast();
      }

    data->m_Mutex.Unlock();

    // Do some work here.
    for (unsigned j = 0; j < 1000; j++)
      {
      v = v / 2.4;
      v = v * 2.4;
      }
    }
  
  return ITK_THREAD_RETURN_VALUE;
}

ITK_THREAD_RETURN_TYPE ConditionVariableTestWatchCount( void *ptr )
{
  ConditionVariableTestUserData *data = static_cast<ConditionVariableTestUserData *>(
                           ( (itk::MultiThreader::ThreadInfoStruct *)(ptr) )->UserData );

  // Lock the mutex and wait for the signal.
  data->m_Mutex.Lock();
  while ( data->m_Counter < data->m_CountLimit )
    {
    data->m_ConditionVariable->Wait( &data->m_Mutex );
    }
  data->m_Mutex.Unlock();  

  return ITK_THREAD_RETURN_VALUE;  
}

ITK_THREAD_RETURN_TYPE ConditionVariableTestCallback( void *ptr )
{
  int threadID = ( (itk::MultiThreader::ThreadInfoStruct *)(ptr) )->ThreadID;

  if ( threadID == 0 )
    {
    ConditionVariableTestWatchCount( ptr );
    }
  else
    {
    ConditionVariableTestIncCount( ptr );
    }
  return ITK_THREAD_RETURN_VALUE;
} 

int itkConditionVariableTest(int , char*[])
{
  ConditionVariableTestUserData cond;
  
  try
    {  
    itk::MultiThreader::Pointer multithreader = itk::MultiThreader::New();
    multithreader->SetNumberOfThreads(3);
    multithreader->SetSingleMethod( ConditionVariableTestCallback, &cond);
    
    for (unsigned int i = 0; i < 1000; i++)
      {
      cond.m_Counter = 0;
      multithreader->SingleMethodExecute();
      }
    }
  catch (itk::ExceptionObject &e)
    {
    std::cerr << e << std::endl;
    return 2;
    }
  
  std::cout << "[TEST PASSED]" << std::endl;
  return EXIT_SUCCESS; 
}

