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Title: [3.14] gh-151644: Fix data race in sys.setdlopenflags/getdlopenflags under free-threading (gh-151768) by miss-islington · Pull Request #153789 · python/cpython · GitHub

Open Graph Title: [3.14] gh-151644: Fix data race in sys.setdlopenflags/getdlopenflags under free-threading (gh-151768) by miss-islington · Pull Request #153789 · python/cpython

X Title: [3.14] gh-151644: Fix data race in sys.setdlopenflags/getdlopenflags under free-threading (gh-151768) by miss-islington · Pull Request #153789 · python/cpython

Description: In free-threading builds, concurrent calls to sys.getdlopenflags() and sys.setdlopenflags() race on interp->imports.dlopenflags. Fix by using FT_ATOMIC_LOAD_INT_RELAXED / FT_ATOMIC_STORE_INT_RELAXED in _PyImport_GetDLOpenFlags and _PyImport_SetDLOpenFlags, consistent with how analogous interpreter-state integer fields (lazy_imports_mode, pystats_enabled) are protected. Relaxed ordering is correct here: dlopenflags is a standalone config integer with no ordering relationship to other memory. (cherry picked from commit cde31ec) Co-authored-by: Jiucheng(Oliver) git.jiucheng@gmail.com Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com Issue: gh-151644

Open Graph Description: In free-threading builds, concurrent calls to sys.getdlopenflags() and sys.setdlopenflags() race on interp->imports.dlopenflags. Fix by using FT_ATOMIC_LOAD_INT_RELAXED / FT_ATOMIC_STORE_INT_RE...

X Description: In free-threading builds, concurrent calls to sys.getdlopenflags() and sys.setdlopenflags() race on interp->imports.dlopenflags. Fix by using FT_ATOMIC_LOAD_INT_RELAXED / FT_ATOMIC_STORE_IN...

Opengraph URL: https://github.com/python/cpython/pull/153789

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