Python 3.14 free-threaded support#2721

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Commits on May 15, 2026

Thread-safety prep for free-threading builds

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Initialise pythonnet on free-threaded Python (#2720)

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Make extension/CLR-object registries thread-safe

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Atomic type creation in ReflectedClrType.GetOrCreate / TypeManager.GetType

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Add free-threaded thread-stress tests and 3.14t to CI matrix

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Atomic GCHandle ownership and finalizer-thread shutdown guards

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Make additional internal registries thread-safe

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test_thread: join worker threads before returning

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test_thread: cover ModuleObject thread-safe registries

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Wider thread-safety audit fixes for free-threaded Python

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Document lock acquisition sites and strong->weak GCHandle swap

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Preserve InternString single-write invariant under DEBUG

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test_thread: cover real-world consumer patterns

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Auto-detect free-threaded libpython in venv home

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Snapshot pypath, use ConcurrentDictionary for thunks and slot holders

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Fix handling of python runtime suffixes m/t

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Fix threadtest race

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Fix double-free in chained ClassDerived Finalize

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Enable Mono CI jobs on free-threaded Python 3.14

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Inline freethreaded_only as pytest.mark.skipif at call sites

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Fix InterruptTest assertion on free-threaded Python 3.14

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Add concurrent stress tests for PyBuffer.Dispose and CLR-cycle gc.collect
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Trim concurrent overhead on hot paths from free-threading prep
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Pre-warm ctor binder in concurrent-gc test to avoid first-call race
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Make MethodBinder.GetMethods lazy init thread-safe under free-threading
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Precompute method precedence to avoid quadratic GetParameters allocations in MethodBinder sort
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Zero the slot in ClassDerived.tp_dealloc when tp_clear already ran to avoid a dangling weak handle
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Keep ClassDerived wrapper alive across the NewObjectToPython slot demotion
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Commits on May 18, 2026

Commits on May 25, 2026

Merge branch 'master' into freethreading-prep
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