On Fri, Jun 23, 2017 at 10:08:26PM +0800, Jia-Ju Bai wrote:
> Hi,
>
> I am a freshman in developing OpenBSD drivers, and I have a question in
> lock usage in OpenBSD kernel code.
>
> I only find two kinds of locks which are often used in OpenBSD drivers,
> namely "mutex lock" and "rw lock". I want to know which lock can be held
> when the current thread can sleep.
>
> From my knowledge of OpenBSD document, I only find that "mutex lock"
> can not be used in this situation. So I have two questions"
> (1) What about "rw lock"?
Yes, rwlock(9) style locks can sleep.
> (2) What about other kinds of locks?
>
> I am looking forward to useful opinions and answers
>
>
> Thanks,
> Jia-Ju Bai
>
