[Users] mqueue support ?

[Dariush Pietrzak]

> To be sure, are you actually talking about the "mqueue" from <mqueue.h> ?
> Because this is api I want to use.
> The filesystem is not mandatory but it would be useful for me to keep track
> of the created message queues.
 I'm talking about Message Queues, one of forms of classical IPC,
aparrently I wasn't aware of new real-time message queues recently
introduced. Since this is fairly recent it seems like it's not virtualized
yet ( AFAIK virtuozoo team does such large jobs only on requests from
larger paying customers, for example IPC message queues were needed for DB2
using customets ), though you should be able to use it from VE's (without
mounting mqueue filesystem). 
 But since it's not virtualized, mqueues would be visible to all guests and
the host too, like this:

lenny64:/# /home/eyck/mqueue
mq_unlink(): success.
mq_open(): success.
mq_unlink(): success.
mq_open(): success.
mq_unlink(): success.
mq_open(): success.
mq_unlink(): success.
mq_open(): success.
mq_unlink(): success.
mq_open(): success.
mq_unlink(): success.
mq_open(): success.
mq_unlink(): success.
mq_open(): success.
mq_unlink(): success.
mq_open(): success.
mq_unlink(): success.
mq_open(): success.
mq_unlink(): success.

... on the host:
venom:/# ls /dev/mqueue/ -l
total 0
-rwxr-x--- 1 root root 80 Aug 20 17:12 mqueue__1
-rwxr-x--- 1 root root 80 Aug 20 17:12 mqueue__2
-rwxr-x--- 1 root root 80 Aug 20 17:12 mqueue__3
-rwxr-x--- 1 root root 80 Aug 20 17:12 mqueue__4
-rwxr-x--- 1 root root 80 Aug 20 17:12 mqueue__5
-rwxr-x--- 1 root root 80 Aug 20 17:12 mqueue__6
-rwxr-x--- 1 root root 80 Aug 20 17:12 mqueue__7
-rwxr-x--- 1 root root 80 Aug 20 17:12 mqueue__8
-rwxr-x--- 1 root root 80 Aug 20 17:12 mqueue__9

(I mounted mqueue on the host only to be able to see the queues, 
they seem to be working  ok without mqueue fs mounted)

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