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Re: [RFC] Block all async signals used by gdb when initializing Guile
- From: Doug Evans <xdje42 at gmail dot com>
- To: Eli Zaretskii <eliz at gnu dot org>
- Cc: Mark Kettenis <mark dot kettenis at xs4all dot nl>, "gdb-patches at sourceware dot org" <gdb-patches at sourceware dot org>, guile-devel <guile-devel at gnu dot org>
- Date: Mon, 31 Aug 2015 22:05:59 -0700
- 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> <201508292104 dot t7TL42OS020892 at glazunov dot sibelius dot xs4all dot nl> <83si711oyo dot fsf at gnu dot org>
On Sat, Aug 29, 2015 at 7:37 PM, Eli Zaretskii <email@example.com> wrote:
>> Date: Sat, 29 Aug 2015 23:04:02 +0200 (CEST)
>> From: Mark Kettenis <firstname.lastname@example.org>
>> CC: email@example.com, firstname.lastname@example.org, email@example.com
>> 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.
> I might be missing something, because I don't see why.
The goal here is to block these signals from being sent to the threads
that Guile (or more specifically libgc) creates.
Posix threads inherit the current value of the process's sigmask,
so as long as the threads are started during Guile initialization,
we can achieve this by blocking the signals before calling Guile's init
routine and then restoring them after Guile's init routine returns.
Note that we don't want to prevent gdb from getting the signals,
we just want them to be sent to gdb's main thread.
Not sure how to do that on windows.