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3 commits

Author SHA1 Message Date
Alper
a2495ff1e7
gh-144490: Fix C++ compatibility in pycore_cell.h (GH-144482) 2026-02-06 22:11:58 -05:00
Sam Gross
3d4ac1a2c2
gh-123358: Use _PyStackRef in LOAD_DEREF (gh-130064)
Concurrent accesses from multiple threads to the same `cell` object did not
scale well in the free-threaded build. Use `_PyStackRef` and optimistically
avoid locking to improve scaling.

With the locks around cell reads gone, some of the free threading tests were
prone to starvation: the readers were able to run in a tight loop and the
writer threads weren't scheduled frequently enough to make timely progress.
Adjust the tests to avoid this.

Co-authored-by: Donghee Na <donghee.na@python.org>
2025-03-26 12:08:20 -04:00
Sam Gross
19c1dd60c5
gh-117323: Make cell thread-safe in free-threaded builds (#117330)
Use critical sections to lock around accesses to cell contents. The critical sections are no-ops in the default (with GIL) build.
2024-03-29 13:35:43 -04:00