[Bug testsuite/31312] attach-many-short-lived-threads gives inconsistent results

["thiago.bauermann at linaro dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31312

--- Comment #26 from Thiago Jung Bauermann <thiago.bauermann at linaro dot org> ---
(In reply to Joel Brobecker from comment #25)
> Hi Thiago,

Hello Joel,

> Would you be able to share an update on this PR? As I understand it,
> Pedro suggested an alternative approach:
> 
> I.e., in gdb, make attach_proc_task_lwp_callback return false/0 here:

<snip>

> Have you had a chance to try that, by any chance?

Sorry for not coming back to this earlier. I had tried Pedro's approach (only
today I realized that I had accidentally sent my first response just to Pedro
back when he suggested it), but I needed to take some time to investigate why
it didn't work back then. I was finally able to understand it today, and I
explain it here:

https://inbox.sourceware.org/gdb-patches/87msptgbey.fsf@linaro.org/

TL;DR: there are two ways of solving the problem, neither of which is ideal
(because it's impossible for GDB to be certain when the inferior has stopped
creating new threads). So it's a matter of choosing between my patch series or
Pedro's suggestion.

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