Messages in this thread | | | Date | Tue, 30 Jun 2009 10:44:35 +0200 | Subject | Problem with wake_up using real-time scheduling | From | Zoltan Bus <> |
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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. I am a newbie at linux, thank you very much for your help.
Zoltan
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