Limits max forks at one time. 

#!/usr/bin/perl

# https://perlmonks.org/?node_id=1228560

use strict;
use warnings;
use Time::HiRes qw( sleep );

my $maxforks = 5; # at any one time
my $active = 0;
for my $param ( 'A' .. 'M' )
  {
  $active -= wait > 0 while $active >= $maxforks;
  if( my $pid = fork )
    {
    $active++;
    print "active forks: $active\n";
    }
  else
    {
    create_file($param);
    defined $pid and exit;
    }
  }
$active -= wait > 0 while $active;

sub create_file
  {
  sleep 0.001 + rand 1;
  my $parameter = shift;
  warn "pid $$ create_file('$parameter')\n";
  # do somethng
  }

[download]

In reply to Re: Learning to use fork() by tybalt89
in thread Learning to use fork() by ovedpo15

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.