is_running() is not implemented in Perl 5.8.8. And I can't upgrade to 5.10

threads is dual-lifed. You can upgrade the module without upgrading Perl.

(Quoted text from linked thread.)

In reply to Re: $thread->is_running() in perl 5.8.8 - catching slow threads by ikegami
in thread $thread->is_running() in perl 5.8.8 - catching slow threads by brycen

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