On Tue, Jun 30, 2009 at 6:07 PM, Zoltan Bus<zoltan.bus@xxxxxxxxx> wrote: > Hello, > > I have a problem on kernel 2.6.26.3. I have a real-time task which > uses the select system call to poll my audio driver. The sleeping task > is waken up by wake_up() from an interrupt handler. > The problem is, that the wake_up() function sometimes does not wake > up the task if real-time priority is used. > > The try_to_wake_up() returns from the out_running section, because of the check > > if (p->se.on_rq) > goto out_running; > > There are no other tasks running when the poll function is called. > > Is this a known problem? Is it fixed somehow in newer versions? > Unfortunately I do not have the possibility to change the newest kernel version. Hm, I am not sure either. Without checking your source code, have you tried other variation of wake_up such as wake_up_poll() or wake_up_interruptible_poll()? Seems promising to me. regards, Mulyadi. -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
