use v5.030;
use threads;
use threads::shared;
use PDL;

BEGIN { $PDL::no_clone_skip_warning = 1; }

my $lock : shared = 0;

srandom(3);  # PDL 2.089_01

for my $tid (1..16) {
    threads->create(sub {
        my $output = "";
        for (1..500000) {
          # my $r = CORE::rand();
            my $r = PDL->random;
            $output .= "$r\n";
        }
        lock $lock;
        print $output;
    });
}

$_->join for threads->list;

##</code><code>##

$ perl test7.pl | wc -l
8000000

$ perl test7.pl | LC_ALL=C sort -u | wc -l
8000000

$ perl test7.pl | LC_ALL=C sort -u | wc -l
8000000

$ perl test7.pl | LC_ALL=C sort -u | wc -l
8000000

##</code><code>##

$ perl test7.pl | wc -l
8000000

$ perl test7.pl | LC_ALL=C sort -u | wc -l
7507936

$ perl test7.pl | LC_ALL=C sort -u | wc -l
7446785

$ perl test7.pl | LC_ALL=C sort -u | wc -l
7446785