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bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126
From: |
Paul Eggert |
Subject: |
bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126 |
Date: |
Wed, 05 Dec 2012 18:04:04 -0800 |
User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/17.0 Thunderbird/17.0 |
On 12/05/2012 01:25 PM, Eli Zaretskii wrote:
> Paul, can you tell why it loops if waitpid is called with WNOHANG and
> returns -1? Won't that cause a busy-wait loop that pegs the CPU?
If waitpid is called with WNOHANG and returns -1, then
errno must equal EINTR. (There's an assertion for this.)
Since the wait was interrupted by a signal, it's supposed
to be retried.
Presumably Emacs is confused, and is waiting for a process
that it already waited for. That's a bug and we should fix it.
I can't tell from the info so far whether the bug is in
the w32 implementation of waitpid, or in Emacs proper.
Was this emacs compiled with error-checking turned on
(./configure --enable-checking, or whatever equivalent is
use in the Microsoft Windows world)?
If so, I'm puzzled as to why the 'eassert (errno == EINTR)'
didn't fire. If not, can you reproduce the bug with
error-checking enabled?
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Stephen Powell, 2012/12/05
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Eli Zaretskii, 2012/12/05
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Stephen Powell, 2012/12/05
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Eli Zaretskii, 2012/12/05
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126,
Paul Eggert <=
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Eli Zaretskii, 2012/12/05
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Paul Eggert, 2012/12/06
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Eli Zaretskii, 2012/12/06
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Paul Eggert, 2012/12/06
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Eli Zaretskii, 2012/12/06
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Paul Eggert, 2012/12/06
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Eli Zaretskii, 2012/12/06
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Eli Zaretskii, 2012/12/06
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Paul Eggert, 2012/12/06
- bug#13086: 24.2.50; Emacs seems to hang at w32proc.c:1126, Eli Zaretskii, 2012/12/07