Take a look at Log::Log4perl. There is no explicit statement if it is thread safe but some FAQs make me think it is. Maybe this will help you too http://www.webmasterkb.com/Uwe/Forum.aspx/perl-newbie/18057/Log-Log4perl

In reply to Re: Logging in a multi-process environment by wwe
in thread Logging in a multi-process environment by tex

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