Just save the value and test before sleeping.
use strict;
use warnings;
use Time::HiRes qw/time sleep/;
sub negative_timer {
my $max = $_[0];
my @time_test;
my $start = time();
for (my $i = 0; $i < $max; $i++) {
$start += 1;
my $dt = $start - time();
if ($dt > 0) {
sleep $dt;
$time_test[$i] = time();
}
}
return @time_test;
}
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