gh-129185: Simplify PyTraceMalloc_Track()

[vstinner]

Since tracemalloc uses PyMutex, it becomes safe to use TABLES_LOCK() even after _PyTraceMalloc_Fini(): remove the "pre-check" in PyTraceMalloc_Track() and PyTraceMalloc_Untrack().

PyTraceMalloc_Untrack() no longer needs to acquire the GIL.

_PyTraceMalloc_Fini() can be called earlier during Python finalization.

• Issue: Segmentation fault during interpreter finalization in PyTraceMalloc_Untrack #129185

[vstinner]

cc @ZeroIntensity

[ZeroIntensity]

LGTM, but it might be worth deleting the blurb entry from the other PR.

[vstinner]

but it might be worth deleting the blurb entry from the other PR.

Recently, I only added a single NEWS entry:

gh-128679: tracemalloc: Fix race conditions when tracemalloc.stop() is called by a thread, while other threads are tracing memory allocations. Patch by Victor Stinner.

This NEWS entry remains relevant.

[ZeroIntensity]

Ok, I thought you had added one for #129191. My bad!