On Jan 13, 2009, at 1:22 PM, Laszlo Nagy wrote:
- posix_ipc is broken under FreeBSD
A clarification: the module posix_ipc is *not* broken. It exposes
FreeBSD's implementation of POSIX IPC which has broken semaphores
(based on my experiments, anyway). The practical result for you is
the same but the difference is very important to me as the module
author. Fixing the posix_ipc module is under my control, fixing
FreeBSD's POSIX IPC is not.
Mea culpa. :-) I did not want to offend you.
Thank you, Laszlo, I appreciate that.
- sysv_ipc does not support message queues at all
That's true, but in your original email you said you were looking
for "semaphores and shared memory". There was no mention of message
queues.
You are right again. :-) I would like to use IPC beacuse I want to
send messages between processes.
If you can wait a bit and Windows is not crucial, sysv_ipc should have
message queue support before too long.
- shm is not maintained
SHM *is* maintained. As I said in my first email and as it says on
the Web page, I'm not developing it any further. No further
development != unmaintained.
My bad again. :-( This is not my day.
It is so interesting that there is no standard implementation for
IPC in Python. I would think it is a very common task for
programmers. I might find myself writting a new IPC module that
works under Windows as well.
Feel free to reinvent the wheel. Or, you could pitch in and help
with what's already out there.
I realize that lack of Windows support is a big minus for both of
these modules. As I said, any help getting either posix_ipc or
sysv_ipc working under Windows would be much appreciated. It sounds
like you have access to the platform and incentive to see it working,
so dig in if you like.
Once I get message queues working for SysV, I want to support unnamed
semaphores in the POSIX module and then I'll consider these modules
mainly feature-complete. After that I can think about adding more
features like:
- Windows support
- Python 2.6/3.0 support
- buffer-style access to shared memory (slicing, etc.)
- Merging these two into a generic ipc module that's agnostic about
POSIX versus Sys V. That might not be realistic.
If I have time in the future, I'll tackle these items myself. But
these projects are just educational for me and paying work will take
priority.
bye
Philip
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