pep-703

1 free lesson tagged pep-703 across Programming. Each one is a short sequence of focused steps with narration and a five-question quiz at the end — take them in any order, no signup required.

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CPython: the GIL and free-threading

Why CPython has a Global Interpreter Lock, what it does and does not protect, and how the three concurrency models differ. Then how PEP 703 free-threading removes the GIL using per-object locks and biased, deferred, and immortal reference counting, plus the tradeoffs that keep it opt-in.

9 steps·~14 min

CPython: the GIL and free-threading

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