Re: kernel condvars: how to use?

[Nick Hudson <skrll%netbsd.org@localhost>]

On 12/08/17 09:04, Nick Hudson wrote:
> On 12/08/17 03:26, Mouse wrote:
>
> > [Brian Buhrow]
> > > 1.  [...].  Mutexes that use spin locks can't be used in interrupt
> > > context.
> > Sure you don't have that backwards?  I _think_ mutex(9) says that spin
> > mutexes are the only ones that _can_ be used from an interrupt.
>
> Brain did get it backwards. To quote mutex(9)...

My brain got Brian backwards...

>            IPL_VM, IPL_SCHED, IPL_HIGH
>
>                  A spin mutex will be returned.  Spin mutexes provide 
> mutual
>                  exclusion between LWPs, and between LWPs and interrupt
> handlers.
>
> Nick