They avoid a race if the timer is too close to the current time.
* atimer.c (alarm_timer, alarm_timer_ok) [SIGEV_SIGNAL]: New static vars.
(set_alarm) [SIGEV_SIGNAL]: Use POSIX timers if available.
- (init_atimer) [SIGEV_SIGAL]: Initialize them.
+ (init_atimer) [SIGEV_SIGNAL]: Initialize them.
2012-09-25 Eli Zaretskii <eliz@gnu.org>