WaitforMultipleObjects doesn't seem to trigger .... always times out

Assistance would be great.

I am just trying to learn multi-threading and the example below should create 10 threads, set them to sleep for a random period of time, wait for them all to trigger they are finished. The ::WaitForMultipleObjects always returns WAIT_TIMEOUT.

Can someone explain to me why the ::WaitForMultipleObjects doesn't complete after all the threads are finished?

I am sure it is pretty simple for the experts and apologies if it is obvious.

Thanks

void CtestmultithreadView::OnGo()
{
  // TODO: Add your command handler code here
  AlgoParam param;
  HANDLE    startHandles[10];
  HANDLE    finishedHandles[10];
  UINT seed = (unsigned)time( NULL );
  srand( seed );
  
  for( int i=0; i<10; i++ )
  {
    startHandles[i] = ::CreateEvent( NULL, FALSE, FALSE, NULL );
    finishedHandles[i] = ::CreateEvent( NULL, FALSE, FALSE, NULL );
    double r = ((double)rand()/RAND_MAX)*10000.0;
    param.startHandle = startHandles[i];
    param.finishedHandle = finishedHandles[i];
    param.i = i;
    param.interval = (DWORD)r;
		
    CWinThread* wt = AfxBeginThread( AlgoController, &param, 0, 0, CREATE_SUSPENDED );
    wt->m_bAutoDelete = TRUE;
    wt->ResumeThread();
    ::SetEvent( startHandles[i] );
    ::Sleep(100);
  }

  DWORD waitResult;
  ATLTRACE( _T("Waiting for multiple objects\n") );
  waitResult = ::WaitForMultipleObjects( 10, finishedHandles, TRUE, 45000 );

  if( waitResult==WAIT_TIMEOUT )
    ATLTRACE( _T("WAIT_TIMEOUT\n") );
  if( waitResult==WAIT_FAILED )
    ATLTRACE( _T("WAIT_FAILED\n") );
  if( waitResult==WAIT_OBJECT_0 )
    ATLTRACE( _T("WAIT_OBJECT_0\n") );
  if( waitResult==WAIT_ABANDONED_0 )
    ATLTRACE( _T("WAIT_ABANDONED_0\n") );
}



UINT AlgoController( LPVOID pParam )
{
  AlgoParam* param = (AlgoParam*)pParam;
	
  int     threadID = param->i;
  DWORD   interval = param->interval;
	
  ::WaitForSingleObject( param->startHandle, INFINITE );
  ATLTRACE2( _T("Thread id : %d sleeping for %ld\n"), threadID, interval );
  ::Sleep( interval );
  ATLTRACE2( _T("Thread id : %d finished\n"), threadID );
  ::SetEvent( param->finishedHandle );
	
  //	AfxEndThread( 0, FALSE );
  return 0L;
}

Tags: MFC, Threads