> On Tue, 22 Jan 2002, Kevin D. Kissell wrote:
>
> > The idea leverages off the fact that a branch likely
> > instruction performs a kind of conditional execution.
> > The instruction in the delay slot is executed only if
> > the branch is taken. This can be used to synthesize
> > a conditional store. The user level code for a simple
> > atomic increment, for example, would look something
> > like this:
>
> Hmm, could you use this to take the race out of the kernel wait loop
> too? Ie use current->need_resched as the test and 'wait' as the
> conditional operation.
It's quite possible. But remember that it won't work on
an R3000. R39xx yes, but not an R3K "classic".
Kevin K.
