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The Python extension module posix_ipc gives Python access
to POSIX inter-process semaphores, shared memory and message queues on
systems that support the POSIX Realtime Extensions a.k.a. POSIX 1003.1b-1993.
That includes most (all?) Linuxes with kernel ≥ 2.6, FreeBSD ≥ 7.2, and
OpenSolaris ≥ 2008.05.
It allows Python applications to perform IPC with non-Python programs. If
you want to IPC between Python programs, you're better off using the
multiprocessing module
or the
multiprocessing.shared_memory module
from Python's standard library.
As of November 2022, the code and documentation are hosted at GitHub:
https://github.com/osvenskan/posix_ipc/
You can download installable source code tarballs get them from PyPI where some Mac-compatible wheels are available too.
Installable source code tarballs are also available for download here.