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Python 3.14 free-threaded support by greateggsgreg · Pull Request #2721 · pythonnet/pythonnet · GitHub

Python 3.14 free-threaded support - #2721

Open

greateggsgreg wants to merge 36 commits into

pythonnet:masterfrom

greateggsgreg:freethreading-prep

Commits on Aug 18, 2026

Thread-safety prep for free-threading builds

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

greateggsgreg
authored and
filmor
committed
e029137
Make extension/CLR-object registries thread-safe

greateggsgreg
authored and
filmor
committed
fd56aa4
Atomic type creation in ReflectedClrType.GetOrCreate / TypeManager.GetType

greateggsgreg
authored and
filmor
committed
b727a15
Add free-threaded thread-stress tests and 3.14t to CI matrix

greateggsgreg
authored and
filmor
committed
debba0d
Atomic GCHandle ownership and finalizer-thread shutdown guards

greateggsgreg
authored and
filmor
committed
585916e
Make additional internal registries thread-safe

greateggsgreg
authored and
filmor
committed
c0ddb29
test_thread: join worker threads before returning

greateggsgreg
authored and
filmor
committed
096e466
test_thread: cover ModuleObject thread-safe registries

greateggsgreg
authored and
filmor
committed
5005f36
Wider thread-safety audit fixes for free-threaded Python

greateggsgreg
authored and
filmor
committed
3ad586a
Document lock acquisition sites and strong->weak GCHandle swap

greateggsgreg
authored and
filmor
committed
6b1f3f4
Preserve InternString single-write invariant under DEBUG

greateggsgreg
authored and
filmor
committed
732d97e
test_thread: cover real-world consumer patterns

greateggsgreg
authored and
filmor
committed
3d56611
Auto-detect free-threaded libpython in venv home

greateggsgreg
authored and
filmor
committed
7094b12
Snapshot pypath, use ConcurrentDictionary for thunks and slot holders

greateggsgreg
authored and
filmor
committed
f49ed1b
Fix handling of python runtime suffixes m/t

greateggsgreg
authored and
filmor
committed
fa89ff0
Fix threadtest race

greateggsgreg
authored and
filmor
committed
a373e79
Fix double-free in chained ClassDerived Finalize

greateggsgreg
authored and
filmor
committed
43a4237
Enable Mono CI jobs on free-threaded Python 3.14

greateggsgreg
authored and
filmor
committed
b42377e
Inline freethreaded_only as pytest.mark.skipif at call sites

greateggsgreg
authored and
filmor
committed
526a297
Fix InterruptTest assertion on free-threaded Python 3.14

greateggsgreg
authored and
filmor
committed
8485837
Add concurrent stress tests for PyBuffer.Dispose and CLR-cycle gc.collect

greateggsgreg
authored and
filmor
committed
a459772
Trim concurrent overhead on hot paths from free-threading prep

greateggsgreg
authored and
filmor
committed
3bf6d68
Pre-warm ctor binder in concurrent-gc test to avoid first-call race

greateggsgreg
authored and
filmor
committed
3433446
Make MethodBinder.GetMethods lazy init thread-safe under free-threading

greateggsgreg
authored and
filmor
committed
4a034f7
Precompute method precedence to avoid quadratic GetParameters allocations in MethodBinder sort

greateggsgreg
authored and
filmor
committed
afd5799
Zero the slot in ClassDerived.tp_dealloc when tp_clear already ran to avoid a dangling weak handle

greateggsgreg
authored and
filmor
committed
95e4811
Keep ClassDerived wrapper alive across the NewObjectToPython slot demotion

greateggsgreg
authored and
filmor
committed
a799c44
Document private helpers added during free-threading prep

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

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

greateggsgreg
authored and
filmor
committed
1130f6a
Add temporary Mono-step diagnostics on Linux/macOS to locate the x64-ubuntu hang

greateggsgreg
authored and
filmor
committed
f75cbab
Revert temporary Mono-step diagnostics now that the underlying race is fixed

greateggsgreg
authored and
filmor
committed
64ea342
Add user-facing threading guide covering GIL, free-threading, and common pitfalls

greateggsgreg
authored and
filmor
committed
fda8211
Harden CollectBasicObject against .NET-GC timing differences

greateggsgreg
authored and
filmor
committed
356d76f

Commits on Aug 21, 2026

Adjust the header offset on 32bit systems
filmor
committed
f0ee4b2

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