PR cli/13110

[Doug Evans]

On Mon, Sep 5, 2011 at 8:56 AM, Pedro Alves <pedro@codesourcery.com> wrote:
> <http://sourceware.org/ml/gdb/2011-09/msg00019.html>
>
> Tested on x86_64-linux and applied.
>
> Repeating what I said on gdb@, I'm now wondering if we actually ever
> need the registers_changed call here or in wait_for_inferior
> nowadays --- we flush threads' register caches when we resume
> them (target_resume).
>
> --
> Pedro Alves
>
> 2011-09-05  Pedro Alves  <pedro@codesourcery.com>
>
>        PR cli/13110
>
>        gdb/
>        * infrun.c (fetch_inferior_event): Check if there's a selected
>        thread before checking if the selected thread is executing.
>
> ---
>  gdb/infrun.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> Index: src/gdb/infrun.c
> ===================================================================
> --- src.orig/gdb/infrun.c       2011-09-05 15:50:49.000000000 +0100
> +++ src/gdb/infrun.c    2011-09-05 15:57:10.693964411 +0100
> @@ -2749,7 +2749,9 @@ fetch_inferior_event (void *client_data)
>      switches threads anyway).  If we didn't do this, a spurious
>      delayed event in all-stop mode would make the user lose the
>      selected frame.  */
> -  if (non_stop || is_executing (inferior_ptid))
> +  if (non_stop
> +      || (!ptid_equal (inferior_ptid, null_ptid)
> +         && is_executing (inferior_ptid)))
>     registers_changed ();
>
>   make_cleanup_restore_integer (&execution_direction);
>

The code may be to additionally check if there's a selected thread,
but when I read it I think "When is null_ptid ever executing?".

Comment in the code is required IMO.