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Title: gh-151644: Fix data race in sys.setdlopenflags/getdlopenflags under free-threading by zangjiucheng · Pull Request #151768 · python/cpython · GitHub

Open Graph Title: gh-151644: Fix data race in sys.setdlopenflags/getdlopenflags under free-threading by zangjiucheng · Pull Request #151768 · python/cpython

X Title: gh-151644: Fix data race in sys.setdlopenflags/getdlopenflags under free-threading by zangjiucheng · Pull Request #151768 · python/cpython

Description: In free-threading builds, concurrent calls to sys.getdlopenflags() and sys.setdlopenflags() race on interp->imports.dlopenflags — a plain int field read and written with no synchronisation. Fix Replace the bare load/store in _PyImport_GetDLOpenFlags / _PyImport_SetDLOpenFlags with FT_ATOMIC_LOAD_INT_RELAXED / FT_ATOMIC_STORE_INT_RELAXED. Atomics are preferred over PyMutex (used for the analogou because each access is a single load or store — no multi-field consistency guarantee is needed. Relaxed ordering is correct: dlopenfl standalone config integer with no ordering relationship to other memory, consistent with how lazy_imports_modeandpystats_enable in the same file. Issue: gh-151644

Open Graph Description: In free-threading builds, concurrent calls to sys.getdlopenflags() and sys.setdlopenflags() race on interp->imports.dlopenflags — a plain int field read and written with no synchronisation. Fix ...

X Description: In free-threading builds, concurrent calls to sys.getdlopenflags() and sys.setdlopenflags() race on interp->imports.dlopenflags — a plain int field read and written with no synchronisation. ...

Opengraph URL: https://github.com/python/cpython/pull/151768

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99b6011 gh-151644: Fix data race in sys.setdlopenflags/getdlopenflags under f… zangjiucheng Jun 20, 2026 https://github.com/python/cpython/pull/151768/commits/99b6011e56471c6f9c017b6fb3edcc64430b01f8
f75b2c7 Misc/NEWS.d: fix news entry filename format for gh-151644 zangjiucheng Jun 20, 2026 https://github.com/python/cpython/pull/151768/commits/f75b2c7a4aa7dc349ca326b47bb2d9826ac9896b
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