Subj : Hyper Threading / Multi-Threaded Queue / Application Freezes
To   : comp.programming.threads
From : Shaw
Date : Tue Apr 12 2005 08:34 am

 have an MFC application which contains a queue which is accessed by
multiple threads.  The main application thread is used to add items to
the queue, while I have a worker thread which is used for taking items
from the queue and passing them to another application.

The queue is implemented using the MFC CList class, and add/remove
operations are guarded by a critical section, therefore access to the
queue is synchronized ( I hope ).

My problem is this program has run great on 100's of machines for well
over 12months, however recently has been tested on a Hyper-Threaded XP
SP2 machine - and for some reasons the application locks up
periodically.  By "locks up", I mean the application frame freezes (not
responding) for up to 10-20secs at a time and then returns to normal
again.  Seems there is some sort of livelock/deadlocal between the
add/remove operations - however I can't work it out.

Is there a problem with critical sections and multi threads on HT
machines?  Anyone had similar problems to this before?
 
I can post code snippets if needs be...
 
Help (pls)
 
Wal

.