Re: master fa52782f5c: Make timer_check even more resilient

[Po Lu <luangruo@yahoo.com>]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> +  block_input ();
> +  turn_on_atimers (false);
>  
>    /* We use copies of the timers' lists to allow a timer to add itself
>       again, without locking up Emacs if the newly added timer is
> @@ -4646,6 +4648,8 @@ timer_check (void)
>    else
>      idle_timers = Qnil;
>  
> +  turn_on_atimers (true);
> +  unblock_input ();

Does input really have to be blocked around this?

The call to `unblock_input' will end up reading async input, which might
not be safe at that spot.  (The X11 drag and drop code used to suffer
from this problem, and debugging the resulting crashes was not easy.)