use Thread; is a dead duck since 5.8.0.

Yes, but https://metacpan.org/module/Thread Ricardo SIGNES / perl-5.18.1 / Thread says its been reworked using threads:: for old code

The working pattern for the OP is following the same pattern., and the code uses perl_mutex

In reply to Re^3: [FCGI.pm] - not threads-safe? by Anonymous Monk
in thread [FCGI.pm] - not threads-safe? by zdm

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