One thing. In my example, for the sake of simplicity, I use printf from multiple threads, without any form of locking. I can get away with this, as long as the output is going to the screen, because on my system the OS serialises the output.

If your system doesn't do this, or (for example) if you want to be able to re-direct the output file, then you should (I should) be using a semaphore. A simple way to do that is to wrap print/printf something like: 

my $stdOutSem :shared;
sub tprint {
    lock $stdoutSem;
    print ref( $_[0] ) eq 'GLOB' ? shift() : () "[@{[ threads->tid ]}]
+:", @_;
}

sub tprintf {
    lock $stdoutSem;
    printf ref( $_[0] ) eq 'GLOB' ? shift() : () "[%s]" . $_[0], $_[ 1
+ .. $#_ ];
}

[download]

Refactor and season to taste.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
"Too many [] have been sedated by an oppressive environment of political correctness and risk aversion."

In reply to Re^7: does threads (still) memleak? by BrowserUk
in thread does threads (still) memleak? by faxm0dem

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