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Python 3.14 free-threaded support - #2721

Merged

filmor merged 38 commits into

pythonnet:masterfrom

greateggsgreg:freethreading-prep

Sep 14, 2026

Merged

Python 3.14 free-threaded support#2721
filmor merged 38 commits into
pythonnet:masterfrom
greateggsgreg:freethreading-prep

Commits on Aug 18, 2026
- Thread-safety prep for free-threading builds
  
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  1d93b30
- Initialise pythonnet on free-threaded Python (#2720)
  
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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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- Atomic GCHandle ownership and finalizer-thread shutdown guards
  
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- 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

Commits

Commits on Aug 18, 2026

Commits on Aug 21, 2026

Commits on Aug 22, 2026