gh-98627: Add an Optional Check for Extension Module Subinterpreter Compatibility #99040
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…_MULTI_INTERP_EXTENSIONS.
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FYI, converting 👇🏻 |
ericsnowcurrently
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…ters (gh-101431) The GILState API (PEP 311) implementation from 2003 made the assumption that only one thread state would ever be used for any given OS thread, explicitly disregarding the case of subinterpreters. However, PyThreadState_Swap() still facilitated switching between subinterpreters, meaning the "current" thread state (holding the GIL), and the GILState thread state could end up out of sync, causing problems (including crashes). This change addresses the issue by keeping the two in sync in PyThreadState_Swap(). I verified the fix against gh-99040. Note that the other GILState-subinterpreter incompatibility (with autoInterpreterState) is not resolved here. #59956
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Enforcing (optionally) the restriction set by PEP 489 makes sense. Furthermore, this sets the stage for a potential restriction related to a per-interpreter GIL.
This change includes the following:
_PyInterpreterConfig.check_multi_interp_extensionsPy_RTFLAGS_MULTI_INTERP_EXTENSIONS_PyImport_CheckSubinterpIncompatibleExtensionAllowed()