On Thu, 18 Jan 2007, Iain Hibbert wrote:

> > > On Tue, 16 Jan 2007, Iain Hibbert wrote:
> > > CALLOUT_LOCK() involves splsched() and tsleep/wakeup is
> > > then prohibited.
> >
> > how does it prohibit tsleep/wakeup?
>
> spl(9) says so ..

Typically I think I misconstrued what it says - I think it means the other
way (ie interrupts firing at IPL_SERIAL) than raising it.

In any case, using splclock() for callout seems to have no problems. I
will leave it running a while and do some intensive tasks to make sure..

iain