You're confusing threads and processes here.

No I am not. If you use Tk; or some other module, and then you use threads, instead of using require Tk;, you'll run into segfaults, etc etc. Using require Tk; avoids the issue completely.

In reply to Re^3: Semaphores failing to prevent race condition by Anonymous Monk
in thread Semaphores failing to prevent race condition by Llew_Llaw_Gyffes

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