Pthread::GetThreadId is FreeBSD specific Perl module providing single non-portable function getthreadid_np() that returns kernel level POSIX thread id as integer value. It may be useful for Perl code running as hook/callback functions in embedded threaded Perl environment when code has no direct control on thread creation. For example, rlm_perl module of FreeRADIUS that may use multiple embedded Perl instances. WWW: http://www.grosbein.net/pthread/