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Date:	8 Nov 2001 12:24:49 -0500
Message-ID:	<20011108172449.22627.qmail@lizard.curl.com>
From:	Jonathan Kamens <jik AT curl DOT com>
To:	cygwin-developers AT cygwin DOT com
In-reply-to:	<20011108120956.A2730@redhat.com> (message from Christopher
	Faylor on Thu, 8 Nov 2001 12:09:56 -0500)
Subject:	Re: Debugging problem in peek_pipe in select.cc
References:	<20011108155542 DOT 19905 DOT qmail AT lizard DOT curl DOT com> <20011108120956 DOT A2730 AT redhat DOT com>

>  Date: Thu, 8 Nov 2001 12:09:56 -0500
>  From: Christopher Faylor <cgf AT redhat DOT com>
>  
>  The point of my addition of a mutex to peek_pipe was to prevent occurrences
>  of PeekNamedPipe blocking, actually.  It can block in pathological situations
>  when another thread/process is doing a blocking read.

Ah, so the MSDN documentation is wrong.

Imagine my surprise :-).

Is it actually documented somewhere else, where I didn't look, that
PeekNamedPipe can block, or did you just have to figure this out by
hard experience?

>  If you are still seeing hangs in the most recent sources, then there is
>  still some kind of race with the guard mutex in peek_pipe.  That is
>  where you will need to investigate.

OK, I'll update my sources and see if I can get it to happen again.

Thanks,

  jik

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