Python 3.14 free-threaded support - #2721

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greateggsgreg wants to merge 38 commits into

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greateggsgreg:freethreading-prep

Commits on Aug 18, 2026

Thread-safety prep for free-threading builds

greateggsgreg
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filmor
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1d93b30
Initialise pythonnet on free-threaded Python (#2720)

greateggsgreg
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e029137
Make extension/CLR-object registries thread-safe

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fd56aa4
Atomic type creation in ReflectedClrType.GetOrCreate / TypeManager.GetType

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b727a15
Add free-threaded thread-stress tests and 3.14t to CI matrix

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debba0d
Atomic GCHandle ownership and finalizer-thread shutdown guards

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585916e
Make additional internal registries thread-safe

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c0ddb29
test_thread: join worker threads before returning

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096e466
test_thread: cover ModuleObject thread-safe registries

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5005f36
Wider thread-safety audit fixes for free-threaded Python

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3ad586a
Document lock acquisition sites and strong->weak GCHandle swap

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6b1f3f4
Preserve InternString single-write invariant under DEBUG

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732d97e
test_thread: cover real-world consumer patterns

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3d56611
Auto-detect free-threaded libpython in venv home

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7094b12
Snapshot pypath, use ConcurrentDictionary for thunks and slot holders

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f49ed1b
Fix handling of python runtime suffixes m/t

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fa89ff0
Fix threadtest race

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a373e79
Fix double-free in chained ClassDerived Finalize

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43a4237
Enable Mono CI jobs on free-threaded Python 3.14

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b42377e
Inline freethreaded_only as pytest.mark.skipif at call sites

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526a297
Fix InterruptTest assertion on free-threaded Python 3.14

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8485837
Add concurrent stress tests for PyBuffer.Dispose and CLR-cycle gc.collect

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a459772
Trim concurrent overhead on hot paths from free-threading prep

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3bf6d68
Pre-warm ctor binder in concurrent-gc test to avoid first-call race

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3433446
Make MethodBinder.GetMethods lazy init thread-safe under free-threading

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4a034f7
Precompute method precedence to avoid quadratic GetParameters allocations in MethodBinder sort

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afd5799
Zero the slot in ClassDerived.tp_dealloc when tp_clear already ran to avoid a dangling weak handle

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95e4811
Keep ClassDerived wrapper alive across the NewObjectToPython slot demotion

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a799c44
Document private helpers added during free-threading prep

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220b4b4
Add debug echoes and a 6-minute step timeout to the Mono test job

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dfda807
Drop the per-loop CLR GC.Collect from concurrent-gc test to avoid Mono+FT+x64 deadlock

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1130f6a
Add temporary Mono-step diagnostics on Linux/macOS to locate the x64-ubuntu hang

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f75cbab
Revert temporary Mono-step diagnostics now that the underlying race is fixed

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64ea342
Add user-facing threading guide covering GIL, free-threading, and common pitfalls

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fda8211
Harden CollectBasicObject against .NET-GC timing differences

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356d76f

Commits on Aug 21, 2026

Adjust the header offset on 32bit systems
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f0ee4b2

Commits on Aug 22, 2026

Drop broken and unnecessary exclude
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3445b08
Be strict about not loading on Python 3.13
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8e6861e