bug#15561: periodic timer stops running

[Paul Eggert]

[Resending with corrected bug-report address; sorry about that.]

Barry OReilly wrote:
> But what happens if the next timer happens to be soon, and Emacs receives 
> SIGALRM inbetween set_alarm and unblock_timers?

Are you talking about a SIGALRM received during the execution of 
do_pending_atimers, between run_timer's call to set_alarm and 
do_pending_atimers's call to unblock_atimers?  If so, the SIGALRM should 
be held by the operating system during that period, and Emacs won't be 
informed of the SIGALRM until unblock_atimers does its thing.  Sorry, I 
don't see how this would cause a timer to stop.