Am Mittwoch, 25. Juli 2007 schrieb John Sigler:
> Karsten Wiese wrote:
>
> > John Sigler wrote:
> >
> >> Is there some form of priority inheritance? Does the IRQ handler get a
> >> priority boost if a high priority task is waiting for it?
> >
> > No. But that would be "nice to have".
>
> No to the first question? to the second question? or to both? :-)
>
To the second.
I checked some soundcard drivers some time ago in -rt kernels, looking for
that "priority boosted by consuming process threaded interrupt handler".
Then there was no such.
> In kernel/futex.c does "PI" stand for Priority Inheritance?
>
I guess so, yes.
> e.g.
>
> /*
> * Priority Inheritance state:
> */
> struct futex_pi_state {
> /*
> * list of 'owned' pi_state instances - these have to be
> * cleaned up in do_exit() if the task exits prematurely:
> */
> struct list_head list;
>
> /*
> * The PI object:
> */
> struct rt_mutex pi_mutex;
>
> struct task_struct *owner;
> atomic_t refcount;
>
> union futex_key key;
> };
>
>
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