[DIFF] Immutability for NoGIL for 3.15a - #112

Open

xFrednet wants to merge 98 commits into

immutable-basefrom

immutable-nogil

Commits on Nov 26, 2025

Proposed code changes for [PEP XXX](link).

Matthew A Johnson
authored and
mjp41
committed
5a3b525
Add Debug trace for where something was frozen.
mjp41
committed
5e8f428
Disable Test Decimal for now
mjp41
committed
78374f9
Add backtracking
mjp41
committed
1bb7711
Refactor
mjp41
committed
870f10e
More refactorings
mjp41
committed
c78046e
More refactorings
mjp41
committed
7034fb9
fixup
mjp41
committed
6ef19fa
CI
mjp41
committed
cab7dd8
CI
mjp41
committed
9decd2d
Fix bug from bad interaction with incremental GC.
mjp41
committed
c9ecaff

Commits on Dec 17, 2025

Changes made in sprint for PLDI deadline. (#62)

mjp41
and
xFrednet
authored
aa72f83

Commits on Jan 15, 2026

Create a Python surface to the ImmutableModule
mjp41
committed
e4df334

Commits on Mar 2, 2026

Commits on Mar 3, 2026

Make CI run for *-main (#70)
mjp41
authored
be3a542
Handle immutable symbols. (#72)
mjp41
authored
47e7c4b

Commits on Mar 4, 2026

Adding tp_reachable (#65)

mjp41
and
xFrednet
authored
3f5bf95
Immutable modules: Fix proxy mode breaking tests
xFrednet
committed
0165c58
Only run `test_ctypes` if ctypes are available
xFrednet
committed
6c05a4e
Immutability: Add module proxy mode tests
xFrednet
committed
30d240f
Merge pull request #71 from mjp41/immutable-proxy-modules
xFrednet
authored
e713de1
Missing clean up code (#73)
mjp41
authored
f1f954b

Commits on Mar 5, 2026

Add "can be viewed as immutable" query to the immutability system (#74)
mjp41
authored
d0aeee0

Commits on Mar 6, 2026

Add set_freezable() for per-object freeze policy (#77)

mjp41
and
xFrednet
authored
e1c6249
Fix freeze rollback to unfreeze completed SCCs on error
mjp41
committed
262d06c
Make freeze take multiple arguments
mjp41
committed
dac0a51
CI complaints
mjp41
committed
085047e
Make freeze return the first argument it is supplied.
mjp41
committed
01b6597
Add tests freeze return first argument
mjp41
committed
32a1390

Commits on Mar 11, 2026

Commits on Mar 12, 2026

.gitignore should only ignore the root /build directory
xFrednet
committed
d1ed4df
Remove register freezable (#80)
mjp41
authored
b44b98b
Immutability: Call weakref callbacks
kulisak12
committed
7f3f531

Commits on Mar 13, 2026

Immutability: More weakref tests
kulisak12
committed
af07e74
Immutability: Run weakref callbacks directly if possible
kulisak12
committed
67342ff
Immutability: Clear weakrefs in two steps
kulisak12
committed
3b50ca9
Immutability: Catch tp_traverse missing types
xFrednet
committed
9025a92
Merge pull request #75 from kulisak12/immutable-weakrefs
xFrednet
authored
5c182a6
Define `Py_tp_reachable` for heap types in CPython
xFrednet
committed
55a2699
Generalize `tp_reachable`
xFrednet
committed
1a6d2cf

Commits on Mar 14, 2026

Commits on Mar 15, 2026

Set `tp_reachable` for Python classes
xFrednet
committed
f764719
Merge pull request #83 from fxpl/fix-heap-type-cycles
xFrednet
authored
86f894f
Correct Segfault introduced by #83
xFrednet
committed
2ab8994
Merge pull request #86 from fxpl/immutable-segfault-fix-83
xFrednet
authored
b6c7df3
Immutability: Clear collecting flag during freezing
xFrednet
committed
cd9415a
Immutability: Basic Pre-freeze infrastructure
xFrednet
committed
d67f752
Ensure that the pre-freeze hook only runs once
xFrednet
committed
f7937c0
pre-freeze: Error on nested calls for MVP
xFrednet
committed
f3da03a
Extract undo_freeze
xFrednet
committed
0015ec3
Treat freezing as transactions to support nested calls
xFrednet
committed
cfa4210
Fix `IMMUTABLE_TRACING` UB and ASAN errors
xFrednet
committed
4bb1d80
Pre-freeze: Add tests and fix bug
xFrednet
committed
28bb471
Merge pull request #76 from fxpl/immutable-freeze-hook
xFrednet
authored
a9c05fa
Alias `isfrozen` to `is_frozen`
xFrednet
committed
6b88aa9
Remove `_PyImmutability_RegisterFreezable` in favour of `set_freezable`
xFrednet
committed
6f541fa
Remove `NotFreezable` type
xFrednet
committed
6bcd48f
Remove `is_freezable_builtin` in favour of `set_freezable`
xFrednet
committed
9052028
Immutability: More cleanup
xFrednet
committed
557daed
sudo `CI=green`
xFrednet
committed
d31e561

Commits on Mar 17, 2026

Add get_freezable, unset_freezable, and FreezabilityOverride context … (#89)
mjp41
authored
d4f8054
Add artifact markers to parts of the implementation
xFrednet
committed
be00d82
Add missing tp_reachable
xFrednet
committed
c9132fd
Allow the Proxy freezability
xFrednet
committed
2c90688
Merge pull request #91 from fxpl/immutable-artifact-markers
xFrednet
authored
d5b515f
Adjusting _Py_FREEZABLE_PROXY (#92)
xFrednet
authored
dae95ca

Commits on Apr 2, 2026

Support frozen sys module in _bootstrap (#96)
xFrednet
authored
b65259d

Commits on Jul 14, 2026

Fix freeze rollback for incomplete SCCs

mjp41
and
Copilot
committed
425066c

Commits on Sep 7, 2026

Commits on Sep 15, 2026

Imm: Update file TODOs
xFrednet
committed
424e80a

Commits on Sep 17, 2026

Immutability: Remove 32Bit support
xFrednet
committed
df3887d
Immutabilty: Redefine immutability flags
xFrednet
committed
9139007

Commits on Sep 21, 2026

Commits on Sep 22, 2026

Immutability: Use atomic operations for `op_flags`
xFrednet
committed
6f7350b

Commits on Sep 23, 2026

Bug fixes rount 1
xFrednet
committed
d20c10a
More bugs
xFrednet
committed
b570af1
I WANT TO BE DONE
xFrednet
committed
baa0769

Commits on Sep 24, 2026

Immutability: Outlined slow path
xFrednet
committed
09abb50
Immutability: Fix CI
xFrednet
committed
785fd38
Immutability: Extract the reachability proc for reuse
xFrednet
committed
a786b40