Re: kernel condvars: how to use?

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

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)...

           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