[linux-audio-dev] [RFC SOURCE] rt_monitor take 2

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Subject: [linux-audio-dev] [RFC SOURCE] rt_monitor take 2
From: Roger Larsson (roger.larsson_AT_skelleftea.mail.telia.com)
Date: Tue Sep 03 2002 - 03:02:31 EEST

With this monitor any process can request RT priorities.
If those (or other) processes overloads the system.
They will be returned to normal priorities.

Note:
* this code is still experimental. I had a complete
lockup because my busy system detection did not work...
(removed since it was not necessary)
* It does probably not work on SMP - I have not given it
much of a thought yet...

compile the source:
        gcc -Wall rt.c -o rt
        gcc -Wall rt_monitor.c -o rt_monitor

then as root:
        mkfifo -m 622 /var/named/rt-request
        ./rt_monitor

start another shell (as a normal user - non root)
        ./rt

output from ./rt will look like this
        policy 0 <- does not have RT priority
        policy 0 <- request sent, waiting...
        ..
        policy 1 <- got rt prio
                                <- sleeps for 5 s
                                <- lockup!!! (for about 4 s)
                                <- rt_monitor reduces the prio, rt exits when detected

/RogerL 

-- 
Roger Larsson
Skellefteċ
Sweden

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