Codejock Developer Community : Grep Leaks Memory

Grep Leaks Memory : Thanks a lot Oleg, I did notice...

Thu, 14 Sep 2006 06:23:19 +0000

Author: danpetitt
Subject: 5045
Posted: 14 September 2006 at 6:23am

Thanks a lot Oleg, I did notice that I had to use a member variable for the thread handle and use DuplicateHandle so its not closed before I can investigate it.

As it uses messages to indicate to the primary thread that it has finished, I had to add a message pump in the wait, so I ended up with (something like):

HANDLE m_myDuplicateThreadHandle;
VERIFY( ::DuplicateHandle( GetCurrentProcess(), m_pSearchThread->m_hThread, GetCurrentProcess(), &m_myDuplicateThreadHandle, 0, FALSE, DUPLICATE_SAME_ACCESS ) );
while( ::WaitForSingleObject( m_myDuplicateThreadHandle, 10 ) == WAIT_TIMEOUT )
{
 MSG msg;
 while( ::PeekMessage( &msg, NULL, 0, 0, PM_NOREMOVE ) )
 {
 if( !AfxGetApp()->PumpMessage() )
 {
  ::PostQuitMessage( 0 );
  break;
 }
 }
 LONG lIdle = 0;
 while( AfxGetApp()->OnIdle( lIdle++ ) );
 Sleep( 0 );
}
CloseHandle( m_myDuplicateThreadHandle );

Grep Leaks Memory : Hello, Thank you for this note. Code...

Thu, 14 Sep 2006 03:56:54 +0000

Author: Oleg
Subject: 5045
Posted: 14 September 2006 at 3:56am

Hello,

Thank you for this note.

Code you need is:

if (m_pSearchThread)
{
m_pSearchThread->m_bCancel = TRUE;
WaitForSingleObject(m_pSearchThread->m_hThread, INFINITE);

m_pSearchThread = NULL;
}

Grep Leaks Memory : I havethe same problem in my own...

Thu, 14 Sep 2006 02:23:51 +0000

Author: danpetitt
Subject: 5045
Posted: 14 September 2006 at 2:23am

I have the same problem in my own app, but with the Grep sample if you start a search and exit the application while the search is executing the ExitInstance doesnt get called and the objects leak.

What's the solution as I have spent days and rewritten this part of my app 6 times and I still get the same problem. I have tried waiting in MainFrame::OnClose until thread finishes but it never does, argh!

Which is why I tried the Grep sample knowing that uses CWinThread as well and it suffers the same.

To give the thread time to cleanup I added this to MainFrame::OnClose

 if( m_pSearchThread )
 {
  m_pSearchThread->m_bCancel = TRUE;
  while( m_pSearchThread )
  {
   Sleep( 1000 );
  }
 }

But the thread gets ExitInstance called but the finished message never arrives so this loop never exits.

Any ideas on why and the solution please?

Thanks.