Re: Antwort: Re: Antwort: Re: [Xenomai-core] Questions about pSOS task mode and task priority

2007-02-04 Thread Philippe Gerum
On Mon, 2007-01-29 at 17:41 +0100, Markus Osterried wrote: Hi Philippe, see below a code snippet for demonstration of the task priority problem. The expected behaviour is that the new task is running immediately after lowering root's priority. The log of the reached statements should

Re: Antwort: Re: [Xenomai-core] Questions about pSOS task mode and task priority

2007-01-31 Thread Gilles Chanteperdrix
Philippe Gerum wrote: On Mon, 2007-01-29 at 14:25 +0100, Gilles Chanteperdrix wrote: Philippe Gerum wrote: On Fri, 2007-01-26 at 18:16 +0100, Thomas Necker wrote: So it clearly states that a non-preemtible task may block (and rescheduling occurs in this case). Ok, so this is a must fix.

Re: Antwort: Re: [Xenomai-core] Questions about pSOS task mode and task priority

2007-01-31 Thread Philippe Gerum
On Wed, 2007-01-31 at 09:55 +0100, Gilles Chanteperdrix wrote: Philippe Gerum wrote: On Mon, 2007-01-29 at 14:25 +0100, Gilles Chanteperdrix wrote: Philippe Gerum wrote: On Fri, 2007-01-26 at 18:16 +0100, Thomas Necker wrote: So it clearly states that a non-preemtible task may block

Re: Antwort: Re: [Xenomai-core] Questions about pSOS task mode and task priority

2007-01-31 Thread Gilles Chanteperdrix
Philippe Gerum wrote: In short, the following patch against 2.3.0 stock fixes the issue, allowing threads to block while holding the scheduler lock. Ok, but this means that the skins which use XNLOCK with the previous meaning need fixing. Only those which really wanted - i.e. by design -

Re: Antwort: Re: [Xenomai-core] Questions about pSOS task mode and task priority

2007-01-31 Thread Philippe Gerum
On Wed, 2007-01-31 at 10:28 +0100, Gilles Chanteperdrix wrote: Philippe Gerum wrote: In short, the following patch against 2.3.0 stock fixes the issue, allowing threads to block while holding the scheduler lock. Ok, but this means that the skins which use XNLOCK with the previous meaning

Re: Antwort: Re: [Xenomai-core] Questions about pSOS task mode and task priority

2007-01-31 Thread Jan Kiszka
Gilles Chanteperdrix wrote: Philippe Gerum wrote: In short, the following patch against 2.3.0 stock fixes the issue, allowing threads to block while holding the scheduler lock. Ok, but this means that the skins which use XNLOCK with the previous meaning need fixing. Only those which

Re: Antwort: Re: [Xenomai-core] Questions about pSOS task mode and task priority

2007-01-30 Thread Philippe Gerum
On Mon, 2007-01-29 at 14:25 +0100, Gilles Chanteperdrix wrote: Philippe Gerum wrote: On Fri, 2007-01-26 at 18:16 +0100, Thomas Necker wrote: So it clearly states that a non-preemtible task may block (and rescheduling occurs in this case). Ok, so this is a must fix. Will do.

Re: Antwort: Re: [Xenomai-core] Questions about pSOS task mode and task priority

2007-01-29 Thread Gilles Chanteperdrix
Philippe Gerum wrote: On Fri, 2007-01-26 at 18:16 +0100, Thomas Necker wrote: Hi Philippe non-preemptive mode. With original pSOS this was allowed and non-preemptive meant that a runnable task cannot be preempted by other tasks but can block itself. Why is this different in Xenomai and is it

Re: Antwort: Re: [Xenomai-core] Questions about pSOS task mode and task priority

2007-01-29 Thread Philippe Gerum
On Mon, 2007-01-29 at 14:25 +0100, Gilles Chanteperdrix wrote: Philippe Gerum wrote: On Fri, 2007-01-26 at 18:16 +0100, Thomas Necker wrote: Hi Philippe non-preemptive mode. With original pSOS this was allowed and non-preemptive meant that a runnable task cannot be preempted by other

Antwort: Re: Antwort: Re: [Xenomai-core] Questions about pSOS task mode and task priority

2007-01-29 Thread Markus Osterried
Hi Philippe, see below a code snippet for demonstration of the task priority problem. The expected behaviour is that the new task is running immediately after lowering root's priority. The log of the reached statements should therefor be: 1, 10, 2, 3, 4, 5 But instead the log is: 1, 2, 3, 4, 10,

Re: [Xenomai-core] Questions about pSOS task mode and task priority

2007-01-26 Thread Philippe Gerum
On Fri, 2007-01-26 at 15:34 +0100, Markus Osterried wrote: Hello, I work together with Thomas Necker on a legacy pSOS project to get it ported to Xenomai. I have already ported a great amount of code and most of it works fine. But we have a pSOS task which (sometimes) works in

Antwort: Re: [Xenomai-core] Questions about pSOS task mode and task priority

2007-01-26 Thread Thomas Necker
Hi Philippe non-preemptive mode. With original pSOS this was allowed and non-preemptive meant that a runnable task cannot be preempted by other tasks but can block itself. Why is this different in Xenomai and is it possible to implement the same behaviour in Xenomai core? Xenomai

Re: Antwort: Re: [Xenomai-core] Questions about pSOS task mode and task priority

2007-01-26 Thread Philippe Gerum
On Fri, 2007-01-26 at 18:16 +0100, Thomas Necker wrote: Hi Philippe non-preemptive mode. With original pSOS this was allowed and non-preemptive meant that a runnable task cannot be preempted by other tasks but can block itself. Why is this different in Xenomai and is it possible to