gecko/tools/performance/startup/gettime.pl

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#!/usr/bin/perl
#
# Use high resolution routines if installed (on win32 or linux), using
# eval as try/catch block around import of modules. Otherwise, just use 'time()'.
#
# 'Win32::API' <http://www.activestate.com/PPMPackages/zips/5xx-builds-only/Win32-API.zip>
# 'Time::HiRes' <http://search.cpan.org/search?dist=Time-HiRes>
# (also: http://rpmfind.net/linux/rpm2html/search.php?query=perl-Time-HiRes)
#
package Time::PossiblyHiRes;
use strict;
#use Time::HiRes qw(gettimeofday);
my $getLocalTime; # for win32
my $lpSystemTime = pack("SSSSSSSS"); # for win32
my $timesub; # code ref
# returns 12 char string "'s'x9.'m'x3" which is milliseconds since epoch,
# although resolution may vary depending on OS and installed packages
sub getTime () {
return &$timesub
if $timesub;
$timesub = sub { time() . "000"; }; # default
return &$timesub
if $^O eq "MacOS"; # don't know a better way on Mac
if ($^O eq "MSWin32") {
eval "use Win32::API;";
$timesub = sub {
# pass pointer to struct, void return
$getLocalTime =
eval "new Win32::API('kernel32', 'GetLocalTime', [qw{P}], qw{V});"
unless $getLocalTime;
$getLocalTime->Call($lpSystemTime);
my @t = unpack("SSSSSSSS", $lpSystemTime);
sprintf("%9s%03s", time(), pop @t);
} if !$@;
}
# ass-u-me if not mac/win32, then we're on a unix flavour
else {
eval "use Time::HiRes qw(gettimeofday);";
$timesub = sub {
my @t = gettimeofday();
$t[0]*1000 + int($t[1]/1000);
} if !$@;
}
return &$timesub;
}
#
#
# Test script to compare with low-res time:
#
# require "gettime.pl";
#
# use POSIX qw(strftime);
#
# print "hires time = " . Time::PossiblyHiRes::getTime() . "\n";
# print "lowres time = " . time() . "\n";
#
# end package
1;