Re: Fwd: Updating Inbox hangs (and I know why)

[Simon Josefsson <jas@extundo.com>]

I think this is an XEmacs problem.  Calling accept-process-output on a
dead process should return an error.  There may be an imap.el bug too,
or a imap.el workaround, but if XEmacs detected if a process had died
when accept-process-output, the exact bug below would probably not
occur.

Reiner Steib <reinersteib+from-uce@imap.cc> writes:

> [ From bugs@gnus.org ... ]
>
> Hi,
>
> I don't know if this should be fixed in imap.el or in XEmacs.
>
> Anyone?
>
> Bye, Reiner.
>
> From: Wolfram Fenske <Wolfram.Fenske@Student.Uni-Magdeburg.DE>
> Subject: Updating Inbox hangs (and I know why)
> Newsgroups: gnus.gnus-bug
> Date: Fri, 09 Dec 2005 06:50:51 +0100
>
>
> Hello!
>
> When I try to update my Inbox (M-g) after a period of inactivity (say
> 5 or 10 minutes), XEmacs hangs. I have to press C-g to stop updating. 
> Pressing M-g afterwards opens a new connection and succeeds. I think 
> what happens is that the connection somehow dies while I'm not active 
> but Gnus somehow doesn't realize this.
>
>
> I have found out that the hanging occurs in "imap-wait-for-tag" in
> "imap.el". The function call that hangs is "(accept-process-output
> imap-process 0 0)". Now I'm not really sure what this is supposed to
> do, but I suspect this is a bug because looking at the definition of
> "accept-process-output" in XEmacs' "event-stream.c" if find this:
>
>   if (msecs)
>     {
>       timeout_id = event_stream_generate_wakeup (msecs, 0, Qnil, Qnil, 0);
>       timeout_enabled = 1;
>     }
>
> That means that a timeout is only established if the given interval is
> non-zero. So in the case of "(accept-process-output imap-process 0
> 0)", it waits indefinitely if not output is generated. But if the
> process is dead, "(memq (process-status imap-process) '(open run))" in
> the while loop above returns "nil" and we get to the function call in
> question and never return.
>
> I tried and set the timeout to 1 second. This way, when I update and
> the imap-process has died, I get an error the first time:
>
>   Process not open for writing: #<process "imap" pid 1400 state:exit>
>
> If I try it again, updating works. I guess what's needed is to restart 
> the process if it's not open or running anymore.
>
> Kind regards
> Wolfram Fenske
>
>
> Gnus v5.10.7
> XEmacs 21.4 (patch 17) "Jumbo Shrimp" [Lucid] (i686-pc-cygwin, Mule) of Fri Nov  4 2005 on hondo
> 201 news.cs.uni-magdeburg.de InterNetNews NNRP server INN 2.4.1 ready (no posting).
>
>
> ----------
>
>
>
> [ User settings stripped, see
>   <news:84fyp2x1hg.fsf@www.uni-magdeburg.de> on news.gnus.org ]