[PATCH] Fixes to Cygwin-specific signal handling

[Eli Zaretskii]

> Date: Tue, 14 Apr 2015 06:16:15 -0700
> From: Joel Brobecker <brobecker@adacore.com>
> Cc: gdb-patches@sourceware.org
> 
> Overall, the patch looks reasonable to me. But I think there are
> at least 3 independent changes, and it would be nice to split those
> two out, for a couple of reasons:
>   1. It allows you to explain the nature of the problem, from the user's
>      standpoint, that the patch is fixing (ie, what user-visible
>      symptoms it fixes);
>   2. it allows us to see how each problem is fixed, and to deal with
>      each issue separately.
> 
> The three issues I view as independent:
>   a. ignoring "invalid handle" errors;
>   b. unsetting saved_context.ContextFlags
>   c. the renaming of have_saved_context into signal_thread_id
>      so you can compare the current thread id with the saved
>      signal_thread_id.

Also, quite a few of the changes are in non-Cygwin parts, so some
explanation of the issues would be appreciated, to make sure the
changes are safe for the native builds as well.

Thanks.