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Date: Sun, 07 Dec 2008 17:05:15 +0100
From: Wolfgang Grandegger <wg@domain.hid>
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Subject: Re: [Xenomai-help] pthread cancelation and scheduling magics
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai-help <xenomai@xenomai.org>

Hi Gilles,

Gilles Chanteperdrix wrote:
> Wolfgang Grandegger wrote:

>> I'm also puzzled why pthread_setschedparam() does make a mode switch
>> to secondary mode (sometimes).
> 
> That is normal. The glibc caches threads priority value, so we have to
> call __real_pthread_setschedparam to update them. This issue has been
> solved differently on trunk, but unfortunately, we can not backport this
> modification on v2.4.x branch.

To get you right. With v2.4.x it is not possible with the POSIX skin to
change the priority of a real-time thread in the primary mode without
loosing determinism (because it will switch to secondary mode). What
options do I have?

Wolfgang.