Erlend E. Aasland <[email protected]> added the comment:
Some info regarding _multiprocessing:
Modules/_multiprocessing/semaphore.c is currently conditionally included in
setup.py (HAVE_SEM_OPEN && !POSIX_SEMAPHORES_NOT_ENABLED), but always included
in Modules/Setup.
Here's some historical bpo's (more or less) relevant to
Modules/_multiprocessing/semaphore.c:
- bpo-7272
- bpo-5545
- bpo-3770
Commit 99c48a8d315fe55c8e1e8eac2e01cd930cb89686 message says:
Author: Hye-Shik Chang <[email protected]>
Date: Sat Jun 28 01:04:31 2008 +0000
Give information for compililation of _multiprocessing.SemLock on FreeBSD:
FreeBSD's P1003.1b semaphore support is highly experimental and
it's disabled by default. Even if a user loads the experimental
kernel module manually, _multiprocessing doesn't work correctly due
to several known incompatibilities around sem_unlink and sem_getvalue,
yet.
Excerpt from the FreeBSD 9.0 release notes[^1], released four years later
(2012-01-12):
kern.features.sysv_sem. System V semaphores support
kern.features.p1003_1b_mqueue. POSIX P1003.1B message queues
support
kern.features.p1003_1b_semaphores. POSIX P1003.1B semaphores support
kern.features.kposix_priority_scheduling POSIX P1003.1B real-time
extensions
I haven't checked OpenBSD or NetBSD yet.
Other relevant commits:
- c4920e86ef7511b4e858028e870b1811437a71d0
- 40a6164afa79f6b97e7e40e0f35f6081fde437c2
[^1]: https://www.freebsd.org/releases/9.0R/relnotes-detailed/
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