-signal is sent 2 system clock ticks later.
-.sh BUGS
-This routine is expensive to use because it is implemented using
-.IR setitimer (2)
-and does eight system calls each time it is invoked.
-It should be implemented using
-.IR select (2).
+signal is sent a short time later.
+.PP
+This routine is implemented using
+.IR setitimer (2);
+it requires eight system calls each time it is invoked.
+A similar but less compatible function can be obtained with a single
+.IR select (2);
+it would not restart after signals, but would not interfere
+with other uses of
+.IR setitimer .