Standard IPC for Python?

[Laszlo Nagy]

> There are plenty of different IPC mechanisms available in
> multiprocessing.
>   
It is good for a special case: a tree of processes, forked from a main 
process. multiprocessing.Queue cannot be used as a general message queue 
between arbitrary processes.
> - mmap.mmap with 0 or -1 as the first argument (Windows and Linux,
> respectively)
>   
Which lacks synchronization between processes. (How do you notify the 
other process? How can the other process wait until notified?)