I completely rewrote the unified SysV and Posix mqueue patch
from Jakub Jelinek.

It adds a new msgfs filesystem that's also mountable
to lookup the names and to unlink() them.
The size of the fifo shows the number of msgs in the queue.
The interface boils down to 7 new syscalls (for now just i386):
- sys_mq_open
- sys_mq_unlink
- sys_mq_timedsend
- sys_mq_timedreceive
- sys_mq_notify
- sys_mq_getattr
- sys_mq_setattr

mq_close is a simple sys_close - the FD is pollable (enhancement)

The change to ipc/msg.c is minimal - just make
- load_msg
- store_msg
- free_msg
accessible (not static).

Now that I've missed the feature freeze - I want to argue that it's
not a new feature - it's a new interface just using already
available features :-)

userspace lib and test progs are on
http://homepage.mac.com/pwaechtler/linux/mqueue/

I'll pipe some code to Ulrich Drepper for inclusion to glibc.
(Linux interface and userspace impl. for all other platforms).