in reply to multithread and STDOUT locking

Try: 
#!/usr/bin/perl

use strict;
use warnings;

select STDOUT;
$| = 1;

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Re^2: multithread and STDOUT locking
by ikegami (Patriarch) on May 06, 2011 at 05:30 UTC
    Flushes aren't guaranteed to be atomic, so that's not guaranteed to work even if you using a single single print per message and the messages don't exceed 4k in size.
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In Section Seekers of Perl Wisdom