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  1. or download this
    my $time_to_sleep = ... #
while ($time_to_sleep > 0) {
   $time_to_sleep = Time::HiRes::usleep($time_to_sleep);
}
  2. or download this
    use Time::HiRes;
$SIG{ALRM} = sub { warn "alarm went off" };
alarm(5);
my $t = Time::HiRes::usleep(10_000_000); # 10 seconds
print "done, t = $t\n";
  3. or download this
    use Time::HiRes qw(setitimer ITIMER_VIRTUAL);
my $state;
...
$state = 0;
setitimer(ITIMER_REAL, 5, 0);
while ($state != 2) { # do other stuff... }