use Time::HiRes qw( usleep ualarm gettimeofday tv_interval );
usleep ($microseconds);
ualarm ($microseconds); ualarm ($microseconds, $interval_microseconds);
$t0 = [gettimeofday]; ($seconds, $microseconds) = gettimeofday;
$elapsed = tv_interval ( $t0, [$seconds, $microseconds]); $elapsed = tv_interval ( $t0, [gettimeofday]); $elapsed = tv_interval ( $t0 );
use Time::HiRes qw ( time alarm sleep ); $now_fractions = time; sleep ($floating_seconds); alarm ($floating_seconds); alarm ($floating_seconds, $floating_interval);
If your system lacks gettimeofday(2) you don't get gettimeofday() or the one-arg form of tv_interval(). If you don't have usleep(3) or select(2) you don't get usleep() or sleep(). If your system don't have ualarm(3) or setitimer(2) you don't get ualarm() or alarm(). If you try to import an unimplemented function in the use statement it will fail at compile time.
The following functions can be imported from this module. No
functions are exported by default.
use Time::HiRes qw(usleep ualarm gettimeofday tv_interval);
$microseconds = 750_000; usleep $microseconds;
# signal alarm in 2.5s & every .1s thereafter ualarm 2_500_000, 100_000;
# get seconds and microseconds since the epoch ($s, $usec) = gettimeofday;
# measure elapsed time # (could also do by subtracting 2 gettimeofday return values) $t0 = [gettimeofday]; # do bunch of stuff here $t1 = [gettimeofday]; # do more stuff here $t0_t1 = tv_interval $t0, $t1; $elapsed = tv_interval ($t0, [gettimeofday]); $elapsed = tv_interval ($t0); # equivalent code
# # replacements for time, alarm and sleep that know about # floating seconds # use Time::HiRes; $now_fractions = Time::HiRes::time; Time::HiRes::sleep (2.5); Time::HiRes::alarm (10.6666666); use Time::HiRes qw ( time alarm sleep ); $now_fractions = time; sleep (2.5); alarm (10.6666666);
$Log: HiRes.pm,v $ Revision 1.16 1997/11/13 02:06:36 wegscd version bump to accomodate HiRes.xs fix.
Revision 1.15 1997/11/11 02:17:59 wegscd POD editing, courtesy of Gisle Aas.
Revision 1.14 1997/11/06 03:14:35 wegscd Update version # for Makefile.PL and HiRes.xs changes.
Revision 1.13 1997/11/05 05:36:25 wegscd change version # for Makefile.pl and HiRes.xs changes.
Revision 1.12 1997/10/13 20:55:33 wegscd Force a new version for Makefile.PL changes.
Revision 1.11 1997/09/05 19:59:33 wegscd New version to bump version for README and Makefile.PL fixes. Fix bad RCS log.
Revision 1.10 1997/05/23 01:11:38 wegscd Conditional compilation; EXPORT_FAIL fixes.
Revision 1.2 1996/12/30 13:28:40 wegscd Update documentation for what to do when missing ualarm() and friends.
Revision 1.1 1996/10/17 20:53:31 wegscd Fix =head1 being next to __END__ so pod2man works
Revision 1.0 1996/09/03 18:25:15 wegscd Initial revision