Squeak processes do not preempt other processes at the same priority,
but they will for processes of lower priority.  Forking a high
priority process will always cause any lower priority process to
yield.  Its therefore possible to implement preemption for processes
of the same priority by spawning a high priority process that spends
most of its time waiting on a semaphore with a timeout.  When it wakes
up it will preempt any running process, causing that process to go to
the back of the process queue.

On 4/11/05, Alan Grimes <alangrimes at starpower.net> wrote:
> 
> I was under the mistaken impression that squeak processes WERE
> preemptive. Now that I know they aren't, that will need to be fixed first.
>