If your main concern is the sleep(60) getting interuppted too soon, just put it in a loop, eg (untested) 
my $start = time;
while ( (my $diff = time - $start) < 60) { sleep(60-$diff) }

[download]

Dave.

In reply to Re: SIGCHLD and sleep() by dave_the_m
in thread SIGCHLD and sleep() by overbyte

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