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gh-135552: Make the GC clear weakrefs later by nascheme · Pull Request #136189 · python/cpython · GitHub
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gh-135552: Make the GC clear weakrefs later #136189

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Merged
nascheme merged 20 commits into from
Aug 7, 2025
Merged

gh-135552: Make the GC clear weakrefs later #136189

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42abb05
Make the GC clear weakrefs later.
nascheme Jun 30, 2025
17a4f9e
Remove inaccurate comment.
nascheme Jul 1, 2025
12f0b5c
Run clear_weakrefs() with world stopped.
nascheme Jul 1, 2025
2f3daba
Defer weakref clears only for refs to classes.
nascheme Jul 2, 2025
123bc25
Ensure weakrefs with callbacks are cleared early.
nascheme Jul 3, 2025
496c0b1
Add NEWS.
nascheme Jul 3, 2025
8a553d1
Add comment about wrlist iteration.
nascheme Jul 3, 2025
01c882f
Merge 'origin/main' into gh-135552-wr-clear-later
nascheme Jul 3, 2025
0060602
Merge 'origin/main' into gh-135552-wr-clear-later
nascheme Jul 8, 2025
900022b
Revise NEWS.
nascheme Jul 8, 2025
84bd123
Defer clear for weakrefs without callbacks.
nascheme Jul 8, 2025
bb29ea1
Add unit test for GH-132413.
nascheme Jul 8, 2025
073409b
Add additional tests for weakref clearing.
nascheme Jul 9, 2025
135223e
Revert unneeded changes to unit tests.
nascheme Jul 9, 2025
fe9e58a
Use assertIsNone() and assertIsNotNone().
nascheme Jul 23, 2025
70ef387
Merge 'origin/main' into gh-135552-wr-clear-later
nascheme Jul 23, 2025
a7551cf
Merge 'origin/main' into gh-135552-wr-clear-later
nascheme Aug 6, 2025
4fe8de0
Revise InternalDocs/garbage_collector.md.
nascheme Aug 7, 2025
24fd972
Revise comments about weakref handling.
nascheme Aug 7, 2025
eca79ce
Merge branch 'origin/main' into gh-135552-wr-clear-later
nascheme Aug 7, 2025
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Add comment about wrlist iteration. 
This is a bit trickly because the wrlist can be changing as we
iterate over it.
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@nascheme
nascheme committed Jul 3, 2025
commit 8a553d14a7fe71a303390b18357a54e6088770ae
3 changes: 3 additions & 0 deletions Python/gc.c
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Expand Up @@ -899,6 +899,9 @@ handle_weakref_callbacks(PyGC_Head *unreachable, PyGC_Head *old)
*/
PyWeakReference *next_wr;
for (PyWeakReference *wr = *wrlist; wr != NULL; wr = next_wr) {
// Get the next list element to get iterator progress if we omit
// clearing of the weakref (because _PyWeakref_ClearRef changes
// next pointer in the wrlist).
next_wr = wr->wr_next;
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nascheme marked this conversation as resolved.

// Weakrefs with callbacks always need to be cleared before
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3 changes: 3 additions & 0 deletions Python/gc_free_threading.c
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Expand Up @@ -1511,6 +1511,9 @@ find_weakref_callbacks(struct collection_state *state)
// that must be called into wrcb_to_call.
PyWeakReference *next_wr;
for (PyWeakReference *wr = *wrlist; wr != NULL; wr = next_wr) {
// Get the next list element to get iterator progress if we omit
// clearing of the weakref (because _PyWeakref_ClearRef changes
// next pointer in the wrlist).
next_wr = wr->wr_next;

// Weakrefs with callbacks always need to be cleared before
Expand Down