Perhaps you could use select?

alarm 10;
while ( ! $done ) {
    $done = is_it_done_yet();
    select undef, undef, undef, 1.0;
}

[download]

I hope this is helpful.

Cheers,

JohnGG

In reply to Re: Alternatives to Mixing Alarm and Sleep by johngg
in thread Alternatives to Mixing Alarm and Sleep by pileofrogs

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