[Python-Dev] Addition of "pyprocessing" module to standard lib.

[Christian Heimes]

r.m.oudkerk schrieb:
> Now that socket.fromfd() and socket._dup() is available on Windows in
> 2.6 and 3.0 (after a patch from me) some of the code could be removed.
> I would also like to see recvfd() and sendfd() get added to the socket
> module -- these functions allow the transfer of file descriptors
> between processes over a Unix domain socket.

I can neither find recvfd in my man pages nor in my header files in
/usr/include on Linux (Ubuntu 8.04 i686). I assume recvfd and sendfd
aren't syscalls but the proposed names for the functions.

> (1) a Connection type (plus PipeConnection on windows)
> (2) a "process shared" lock/semaphore type
> (3) Win32 functions/constants to allow use of named pipes
> (4) A few other Win32 functions/constants
> (5) A wrapper making PyObject_AsWriteBuffer() available from Python
> 
> I suppose (4) and perhaps (3) could sensibly be added/merged with
> _subprocess.c.  (5) could also be moved somewhere else.

Why do you want to put the named pipes into the _subprocess module? IMHO
the socket module is more appropriate for communication channels like
name pipes.

> (Off-topic but I think that the way that subprocess.Popen.__del__()
> keeps the object alive if the process has not finished is a little
> distasteful.  The __del__() method and the _cleanup() function are
> completely unecessary on Windows since Windows does not have zombie
> processes.  On Unix __del__() could simply save the pid to the _active
> list and _cleanup() could be rewritten to use os.waitpid().)

Interesting idea. The approach could safe us some trouble. I'm always +1
when it comes to removing ugly hacks.

Christian