Straight from 'perlthrtut' of 5.18.
Just throw two numbers at it: perl primes.pl 2 100
#!/usr/bin/perl
use strict;
use warnings;
use threads;
use Thread::Queue;
sub check_num {
my ($upstream, $cur_prime) = @_;
my $kid;
my $downstream = Thread::Queue->new();
while (my $num = $upstream->dequeue()) {
next unless ($num % $cur_prime);
if ($kid) {
$downstream->enqueue($num);
} else {
print("Found prime: $num\n");
$kid = threads->create(\&check_num, $downstream, $num);
}
}
if ($kid) {
$downstream->enqueue(undef);
$kid->join();
}
}
my $stream = Thread::Queue->new(shift()..shift(), undef);
check_num($stream, 2);
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