From mboxrd@z Thu Jan  1 00:00:00 1970
From: Armin Steinhoff <armin@steinhoff.de>
Subject: Re: Operation not permitted / pthread_setschedparam
Date: Tue, 30 Sep 2014 14:32:37 +0200
Message-ID: <542AA2E5.1050507@steinhoff.de>
References: <542A88A8.7060800@steinhoff.de> <CAKudYbMN0W2uiKN-TEMMkHLUNyeBP38syjg0x7DtAvj1fZq+YA@mail.gmail.com>
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To: Harry van Haaren <harryhaaren@gmail.com>
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Harry,

I'm running as root. The same code works w/o problem with the normal
(non RT) kernel.
"chrt -m" shows  1/99 for SCHED_FIFO. I did also add @root - rtprio 99
to limits.conf ... no success, as expected. 

--Armin

Harry van Haaren schrieb:
> On Tue, Sep 30, 2014 at 11:40 AM, Armin Steinhoff <armin@steinhoff.de> wrote:
>> a "pthread_setschedparam" call of the code below terminates with an
>> errno == 1  ... means "Operation not permitted"
> At risk of asking the obvious: are you running as root, or does the
> user running this code have RT priorities?
>
> User priorities controlled by /etc/security/limits.conf : you can set
> a groups max-rtprio like so:
> @audio          -       rtprio          65
>
>> KERNEL_EVENT_THREAD_PRIORITY is 55!
>> How to solve that problem ?
> Anything above 50 requrires changing limits.conf  or root IIRC.
>
> HTH, -Harry
>