http://www.perlmonks.org?node_id=996750


in reply to fork and Linux/Windows portability

This should run without change, anywhere there is a threaded perl: 

#! perl -slw
use strict;
use List::Util qw[ sum ];
use threads;

sub joinable { threads->list( threads::joinable ) };
sub running  { threads->list( threads::running  ) };

my @files = map glob, @ARGV;

our $T //= 4;

my @results;
for my $file ( @files ) {
    async { return `wc -l "$file"`; };
    next if running() < 4;
    push @results, $_->join =~ m[(\d+)] for joinable;
    sleep 1 while running >= 4;
}
sleep 1 while running;
push @results, $_->join =~ m[(\d+)] for joinable;

print "The average number of lines in all the files is:",
    sum( @results ) / @results;

__END__
C:\test>996731 a*.*
The average number of lines in all the files is:77346.75

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