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To: Ken Brown <kbrown AT cornell DOT edu>
Subject: Re: Another pipe-related problem?
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Date: Tue, 09 Nov 2021 14:47:26 +0000
In-Reply-To: <eb8d7d4f-d1ed-6f30-2ac3-1b24166243d9@cornell.edu> (Ken Brown's
 message of "Tue\, 9 Nov 2021 09\:11\:28 -0500")
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From: "Henry S. Thompson via Cygwin" <cygwin AT cygwin DOT com>
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[private reply -- it's not exactly a private repo, but it's really not
 ready for prime-time with users expecting to be able to raise issues
 etc.]

Ken Brown writes:

> ...
> I was aware that the bitbucket repo didn't exist, because I tried to get the
> sources there.  But I didn't know about the fork.  Please point me to it, or
> just make a tarball available to me somehow.

https://foss.heptapod.net/xemacs

>> ...

> I'll have to reproduce the hang myself in order to test this (or
> maybe you could test it), but I now have a new guess: If the read
> call above keeps failing with EINTR, then we're in an infinite loop.

> This could happen because of the following code in
> fhandler_pipe::raw_read:
>
>   DWORD waitret = cygwait (read_mtx, timeout);
>   switch (waitret)
>     {
>     case WAIT_OBJECT_0:
>       break;
>     case WAIT_TIMEOUT:
>       set_errno (EAGAIN);
>       len = (size_t) -1;
>       return;
>     default:
>       set_errno (EINTR);
>       len = (size_t) -1;
>       return;
>     }
>

Let's wait and see what Takashi says -- I see from github blame that
was introduced between 3.2 and 3.3.0, so certainly _could_ be the
culprit.  I've never tried to build my own Cygwin...

Thanks,

ht
-- 
       Henry S. Thompson, School of Informatics, University of Edinburgh
      10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440
                Fax: (44) 131 650-4587, e-mail: ht AT inf DOT ed DOT ac DOT uk
                       URL: http://www.ltg.ed.ac.uk/~ht/
 [mail from me _always_ has a .sig like this -- mail without it is forged spam]

The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.


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