Don't sleep FOR one second, sleep until the NEXT second.

Thanks for the lightbulb. I see no error since doing it that way. I wonder if the perldoc for sleep should add something like:

To delay ON each second, don't sleep FOR one second, sleep until the NEXT second, using sleep and time from Time::HiRes:

Explain why this is a subtle trap:

while () {
  print something();
  sleep 1 # WRONG!
}

Calculate the next second:

use Time::HiRes qw/sleep time/;
while () {
  print something();
  sleep do { (int time + 1) - time } # RIGHT!
}

Maybe it's already a FAQ? I don't know. Thank you!

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