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by eridius
2687 days ago
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I'm pretty rusty on Python but my impression wasn't that the GIL meant just "no data races" but that it also meant "data can't change out from under you in the middle of executing a statement". You could write a Python interpreter that ensured no data races and yet still had divergent behavior by allowing shared data to be mutated by another thread halfway through executing a statement. |
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That's not quite what the GIL guarantees. It guarantees that data can't change out from under you in the middle of executing a bytecode. But many Python statements (and expressions) do not correspond to single bytecodes.