Bug report

Bug description:

Due of absence of thesem_getvalue C function in the MacOSX semaphore implementation,Lock andRLock representation strings are invalid in themultiprocessing module.

Call toself._semlock._get_value() raises an exception, and set part of repr with'unknown'.

importmultiprocessingasmpprint(mp.Lock()#  <Lock(owner=unknown)> vs <Lock(owner=None)> on Linuxprint(mp.RLockj())#  <RLock(unknown, unknown)> vs <RLock(None, 0)> on Linux

I propose to replace in the__repr__ method of each class the following test:

withelif not self._semlock._is_zero():.

This method is available and valid on each OS.

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS

Linked PRs

• gh-125679: multiprocessing Lock and RLock - fix invalid representation string on MacOSX. #125680
• [3.13] gh-125679: multiprocessing Lock and RLock - fix invalid representation string on MacOSX. (GH-125680) #126533
• [3.12] gh-125679: multiprocessing Lock and RLock - fix invalid representation string on MacOSX. (GH-125680) #126534