Subj : IOCP problem
To   : comp.programming.threads
From : Richard Hollis
Date : Tue Jan 25 2005 07:42 am

I've setup IOCP for a named pipe server that I have.

I create the pipes and then create the completion port and assign it to each
pipe in turn.  Then I create a couple of worker threads and each worker sits
on GetQueuedCompletionStatus.

I then started stress testing the server and I've found that I get strange
hangs if I use more than one worker thread.  I did some reading in this
newsgroup yesterday and somebody mentioned that with IOCP it is possible for
one than one thread to wake up to handle the event, so I handled this by
using a "running" flag for the threads and let one thread actually handle
the event, with the others doing nothing, but sending a completion packet
back.  I though this was working, but it still seems to act strangely when
more than one worker thread is created.

I think I must be doing something wrong somewhere, but I'm not sure where.
I thought I had it licked when I read about the problem that somebody else
had and it was exactly the same.

Cheers
Richard

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