Hello
Some update about the spawnl() thingy ;
I've adapted the win32 code to have a new unix Popen object, which works
with a spawn() semantic. It's quite straightforward, and the
mutiprocessing call of a python functions works OK.
But I've run into some trouble : synchronization primitives.
Win32 semaphore can be "teleported" to another process via the
DuplicateHandle() call. But unix named semaphores don't work that way -
instead, they must be opened with the same name by each spawned subprocess.
The problem here, the current semaphore C code is optimized to forbid
semaphore sharing (other than via fork) : use of (O_EXL|O_CREAT) on
opening, immediate unlinking of new semaphores....
So if we want to benefit from sync primitives with this spawn()
implementation, we need a working named semaphore implementation, too...
What's the best in your opinion ? Editing the current multiprocessing
semaphore's behaviour to allow (with specific options, attributes and
methods) its use in this case ? Or adding a new NamedSemaphore type like
this one ?
http://semanchuk.com/philip/posix_ipc/
Regards,
Pascal
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