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Every(3) User Contributed Perl Documentation Every(3)
 

Every - return true every N cycles or S seconds

 for (0..200)
 {
  print_stats() if every(20);           # every 20 cycles
  print_times() if every(seconds => 5); # every 5 or more seconds
  sleep 3;
 }

Returns true every $number times it's called, or every time $number seconds have elapsed since the last time it was called.
The "every()" function keeps track of where it was called by line, even if you call it twice on the same line, e.g.
 print "hello" if every(5) or every(6);
The "every()" function will use the Devel::Callsite module to find the opcode and interpreter context (both unique numbers).
The optional @id is a list of arguments that compose a unique identifier. In other words, "every(100, 'x')" will run its 100 cycles independently of "every(100, 'x', 'y')".

Returns true when the conditions (cycles or seconds elapsed) are met. The first cycle doesn't count (so e.g. "every(100)" will be true at 100, 200, etc.)
Thanks to Dr.Ruud on comp.lang.perl.misc for helping with this idea, and to Jerry Hedden for cleaning it up. Thanks to Ben Morrow for getting Devel::Callsite started, which module is essential to Every.
Thanks to Jerrad Pierce and ikegami for the bug reports and help.

None known.

Copyright 2008, Ted Zlatanov (Теодор Златанов). All Rights Reserved. This module can be redistributed under the same terms as Perl itself.

Ted Zlatanov <tzz@lifelogs.com>

2010-04-01 perl v5.28.1

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