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

Merged

colesbury merged 9 commits intopython: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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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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Blurb for change
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Update Include/internal/pycore_critical_section.h

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colesbury
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Tweak comments per review

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colesbury
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Use braced if per review

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colesbury
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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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Remove listobject.h include per review (all users of pycore_critical_section include Python.h which provides listobject.h)
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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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