From: Paul Eggert <eggert@cs.ucla.edu>
To: Eli Zaretskii <eliz@gnu.org>
Cc: lekktu@gmail.com, 12446@debbugs.gnu.org
Subject: bug#12446: port better to POSIX hosts lacking _setjmp
Date: Sat, 15 Sep 2012 01:55:14 -0700 [thread overview]
Message-ID: <50544272.2020602@cs.ucla.edu> (raw)
In-Reply-To: <83ligbu1uk.fsf@gnu.org>
On 09/15/2012 01:28 AM, Eli Zaretskii wrote:
> So what was the rationale of turning away from _setjmp
Some POSIXish hosts lack _setjmp, but have sigsetjmp,
and their longjmp implementations munge the signal masks.
>> > Messups are trickier, because they involve rare race conditions.
>> > They can occur if Emacs or a system call has set the signal mask to X,
>> > but a longjump unexpectedly changes it to Y, where Y is not equal to X.
> Why is that a messup?
Because Emacs then continues with the wrong sigmask, which can
cause signals to be blocked when they shouldn't be.
next prev parent reply other threads:[~2012-09-15 8:55 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-14 19:44 bug#12446: port better to POSIX hosts lacking _setjmp Paul Eggert
2012-09-14 20:30 ` Eli Zaretskii
2012-09-14 21:28 ` Paul Eggert
2012-09-15 7:10 ` Paul Eggert
2012-09-15 8:08 ` Eli Zaretskii
2012-09-15 8:46 ` Paul Eggert
2012-09-15 9:41 ` Eli Zaretskii
2012-09-15 10:06 ` Paul Eggert
2012-09-15 7:12 ` Eli Zaretskii
2012-09-15 7:50 ` Paul Eggert
2012-09-15 8:28 ` Eli Zaretskii
2012-09-15 8:55 ` Paul Eggert [this message]
2012-09-15 9:44 ` Eli Zaretskii
2012-09-15 10:00 ` Paul Eggert
2012-09-15 10:27 ` Eli Zaretskii
2012-09-15 20:26 ` Paul Eggert
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