use fork() to create threads

fork doesn't create threads*, it creates new processes which are copies of the parent. You're only sending the signal the parent process, so nothing changes the copies of the logger objects found in the child processes.

Even if you did create threads, Perl gives each thread a copy of every Perl variable except for variables that had been shared explicitly. You didn't create a shared variable that holds a logger object, and I doubt that the logger does this for you.

* — Except in Windows. fork is emulated using threads in Windows.

In reply to Re^3: log level in modules by ikegami
in thread log level in modules by Anonymous Monk

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