gh-119247: Add macros to use PySequence_Fast safely in free-threaded build - #119315

Merged

colesbury merged 9 commits into

python:mainfrom

MojoVampire:fix-issue-119247

May 22, 2024

Commits on May 22, 2024

Initial work on critical sections for fast sequences while developing test for regressions
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b22f6e2
Test for efficacy of fast sequence locking macro on str.join, both tests segfault or die with assertion failures >95% of the time without locking macro, pass reliably with locking macro
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2b4fe19
Blurb for change
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536defc
Update Include/internal/pycore_critical_section.h

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colesbury
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0475c8e
Tweak comments per review

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colesbury
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1f3cec0
Use braced if per review

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colesbury
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707852d
Per review, refactor extend test to extend multiple times, and reduce total time to run tests (both tests combine to less than 200 ms in debug build on my laptop)
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66f0e6c
Remove listobject.h include per review (all users of pycore_critical_section include Python.h which provides listobject.h)
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515ee56
Reduce readers in test_racing_join_replace to 10, use Event to synchronize, and perform multiple joins per loop to increase chance of repro without synchronization
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254a5a5