When you execute the following code you get a synchronised counting/printing action

use threads;
use threads::shared;
my $test :shared;
$test = 0;
testing_thread();

sub testing_thread {

while ($test <= 100) {
my $thr1 = threads->create(\&progress_count, $test);
$test += 1;
$thr1->join();
}

}

sub progress_count {
    print $test, " \n";

}

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In reply to Re^6: Threading in a loop by jerre_111
in thread Threading in a loop by jerre_111

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