Re: [PATCH v2 02/13] script language API for GDB: extension.[ch]

[Doug Evans <xdje42@gmail.com>]

On Tue, Jan 21, 2014 at 8:21 PM, Mark H Weaver <mhw@netris.org> wrote:
> Tom Tromey <tromey@redhat.com> writes:
>
>>>>>>> "Ludovic" == Ludovic Courtès <ludo@gnu.org> writes:
>>
>> Ludovic> I guess this is another limitation of Guile’s current signal handling
>> Ludovic> strategy, and something we should fix.
>>
>> FWIW I think it would be sufficient for gdb if scm_system_async_mark, or
>> something like it, could be invoked from a signal handler.  Then a
>> SIGINT in gdb could install an async callback that later checks gdb's
>> quit flag.
>
> As discussed on IRC, one way to accomplish this with current Guile is
> as follows: establish a dedicated thread whose sole job it is to call
> 'scm_system_async_mark_for_thread' as directed by messages received from
> a pipe.  A signal handler can then schedule asyncs by writing messages
> to this pipe.
>
> We'll try to come up with an nicer solution at some point.

Righto, and thanks.

I'll implement this as a follow-on to the current patch series.
It'll be mostly just new code, and the current patch series is big enough.