At least for Python, your assertion is partially incorrect. The GlobalInterpreterLock "prevents multiple native threads from executing Python bytecodes at once", but (other than that), Python threads are native OS threads. You don't get as much benefit from these threads while running inside of Python, but at least C extensions (and it seems also blocking system calls) can release the GIL to other code.

In reply to Re^16: threading a perl script by Corion
in thread threading a perl script by Boetsie

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