On May 26, 2007, at 18:17 , J J wrote:

> Well Tim and John had mentioned that a given process gets preemited  
> after around 250 ms

You must have misinterpreted that part. A given process continues to  
run indefinitely until one of the conditions listed by Nicolas below  
happens.

- Bert -

On May 26, 2007, at 18:16 , nicolas cellier wrote:
>> It can be pre-empted
>> - if the process explicitely yield
>> - if the process is blocked on a Semaphore
>> - if a higher priority process is unblocked.