gh-119247: Add macros to use PySequence_Fast safely in free-threaded build by MojoVampire · Pull Request #119315 · python/cpython

…sts segfault or die with assertion failures >95% of the time without locking macro, pass reliably with locking macro

Use braces to restrict scope of conditional locking

Co-authored-by: Sam Gross <colesbury@gmail.com>

Co-authored-by: Sam Gross <colesbury@gmail.com>

Co-authored-by: Sam Gross <colesbury@gmail.com>

… total time to run tests (both tests combine to less than 200 ms in debug build on my laptop)

…section include Python.h which provides listobject.h)

…onize, and perform multiple joins per loop to increase chance of repro without synchronization

…eaded build (pythonGH-119315)

Add `Py_BEGIN_CRITICAL_SECTION_SEQUENCE_FAST` and
`Py_END_CRITICAL_SECTION_SEQUENCE_FAST` macros and update `str.join` to use
them. Also add a regression test that would crash reliably without this
patch.
(cherry picked from commit baf347d)

Co-authored-by: Josh {*()} Rosenberg <26495692+MojoVampire@users.noreply.github.com>

…readed build (GH-119315) (#119419)

Add `Py_BEGIN_CRITICAL_SECTION_SEQUENCE_FAST` and
`Py_END_CRITICAL_SECTION_SEQUENCE_FAST` macros and update `str.join` to use
them. Also add a regression test that would crash reliably without this
patch.
(cherry picked from commit baf347d)

Co-authored-by: Josh {*()} Rosenberg <26495692+MojoVampire@users.noreply.github.com>

…eaded build (python#119315)

Add `Py_BEGIN_CRITICAL_SECTION_SEQUENCE_FAST` and
`Py_END_CRITICAL_SECTION_SEQUENCE_FAST` macros and update `str.join` to use
them. Also add a regression test that would crash reliably without this
patch.