[Xenomai-main] thread switch hookl

[Christian GAGNERAUD]

Hi,

I'm playing with the thread switch hook functionality, but i think that 
the switch hook is not call in schedule() at the right place.
I explain me:

The hook is called in the second part of the schedule routine (after the 
contexte switch), so the hook() will be called only when the preemted 
thread will be reschedule (if it didn't die).
Moreover the Documentation said that the hook is called with "the 
descriptor address of the thread which has been switched out" as 
parameter, but it seems to be false since in schedule the call is:

xnpod_fire_callouts(&nkpod->tswitchq,sched->runthread);

so the sched->runthread value will be passed to the hook, but the hook 
parameter value is the same as the value return by 
xnpod_current_thread(). So we can't know in this hook both the prempted 
thread and the incoming thread. :(

If the hook is called before the contexte switch, it is more interesting 
(for what i wan't to do: just trace the process switch):
- the hook will be called on every switch context (even if the preempted 
thread is killed or never resumed)
- in the hook routine we can know wich thread has been preempted 
(routine parameter) and the incoming one (with xnpod_current_thread().


Am i missing something? Isn't this modification interesting?


With best regards.

Christian






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Gagneraud Christian

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