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Re: [RFC] Block all async signals used by gdb when initializing Guile
- From: Mark Kettenis <mark dot kettenis at xs4all dot nl>
- To: xdje42 at gmail dot com
- Cc: eliz at gnu dot org, gdb-patches at sourceware dot org, guile-devel at gnu dot org
- Date: Sat, 29 Aug 2015 23:04:02 +0200 (CEST)
- Subject: Re: [RFC] Block all async signals used by gdb when initializing Guile
- Authentication-results: sourceware.org; auth=none
- References: <m3r3mmdn7g dot fsf at sspiff dot org> <831tel3o68 dot fsf at gnu dot org> <CAP9bCMQmWmbLg9qZ3ZyVyTF=fBOB-sJtFAr1=OCC_g53aGYRUw at mail dot gmail dot com> <83wpwd26lt dot fsf at gnu dot org> <CAP9bCMRh+y4aNzgOThff5syzGs5-i2XpcbLVYw5G1avgd4QVvA at mail dot gmail dot com>
> Date: Sat, 29 Aug 2015 13:39:55 -0700
> From: Doug Evans <xdje42@gmail.com>
>
> On Sat, Aug 29, 2015 at 1:16 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> >> Date: Sat, 29 Aug 2015 12:20:24 -0700
> >> From: Doug Evans <xdje42@gmail.com>
> >> Cc: "gdb-patches@sourceware.org" <gdb-patches@sourceware.org>, guile-devel <guile-devel@gnu.org>
> >>
> >> > What about platforms that don't have sigprocmask, but do have SIGINT?
> >> > Don't we want to block SIGINT on those platforms?
> >>
> >> Do they have threads
> >
> > They might. (The only way I've succeeded to have a working Guile on
> > Windows was to disable threads, but I hope that bug will be fixed one
> > day.)
> >
> >> and how does one block SIGINT on those platforms?
> >
> > With a call to 'signal', I guess.
>
> I'm guessing that won't work here, we'll need something else.
> The issue is we need the threads that guile starts
> to have these signals blocked. Then after guile init
> returns we unblock the signals.
I suppose blocking these in the threads that guile starts is necessary
because that is the only way to guarantee that those signals will be
delivered to the main gdb thread on POSIX systems.
On Windows you probably need to do something completely different.