[RFC] Block all async signals used by gdb when initializing Guile

[Eli Zaretskii]

> Date: Sat, 29 Aug 2015 23:04:02 +0200 (CEST)
> From: Mark Kettenis <mark.kettenis@xs4all.nl>
> CC: eliz@gnu.org, gdb-patches@sourceware.org, guile-devel@gnu.org
> 
> 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.