I have problems following, and it really depends what the OP really wants (this has a strong stench of an XY problem)

For one possible interpretation: 

use Time::HiRes (sleep time);

my $next_time = time();

while (1) {
    next if time() < $next_time;

    $next_time += 60;              # no accumulated lag

    my $price = fetch();
    do_it($price);

    my $took = time()- ($next_time-60); 

    handle_edge_case() if $took > 60;

    sleep 59 - $took;
}

[download]

(totally untested, there are most probably dragons...)

The idea is that you only skip at max 59 seconds (or even a bit more) with sleep to let the loop catch the "exact time".

It still needs to handle the edge-case that fetch() and do_it() $took longer than 60 secs tho.

But how exactly really depends on the problem to solve...

So what am I missing justifying two communicating processes???

edit

The logic might be clearer if I calculated $remain = $next_time - time(); instead of $took ... left as task for the interested reader :)

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re^5: making a loop script with a remote URL call faster by LanX
in thread making a loop script with a remote URL call faster by brandonm78

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