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Date:	Wed, 31 Mar 2004 22:36:10 -0800 (PST)
From:	Patrick Samson <p_samson AT yahoo DOT com>
Subject:	Re: Postgres Backend doesn't catch the next command, after SIGUSR2
To:	cygwin AT cygwin DOT com
In-Reply-To:	<20040330094430.GG17229@cygbert.vinschen.de>
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--- Corinna Vinschen wrote:
> On Mar 30 01:03, Patrick Samson wrote:
> > >From msdn:
> > "All I/O operations that are canceled will
> complete
> > with the error ERROR_OPERATION_ABORTED. All
> completion
> > notifications for the I/O operations will occur
> > normally."
> 
> Urgh, I mised that.
> 
> > What's your feeling about:
> > if (!CancelIo ((HANDLE) socket))
> >   {...}
> > else
> >   {
> >    if (WSAGetOverlappedResult (socket, &ovr, &len,
> >  FALSE, flags) && len != 0)
> >     ret = (int) len;
> >    else WSASetLastError (WSAEINTR);
> 
> Did you try it?

Yes. It worked.
I ran my test case this night for 30000 runs.

> Yesterday I changed Cygwin to use
> asynchronous I/O
> instead of overlapped I/O so it now can do without
> CancelIo.
> However, two people reported hangs which don't occur
> for me.  If
> if takes too long to track down, I guess I'll revert
> to overlapped
> I/O plus your patch.  But I would be more happy with
> a working
> async I/O solution.

Is it still worth?


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