Preempt Definition

Hi,

As far as i understand preempt definition, it is basically to acquire task before anyother operator takes it.

Preempt - 0 means hence no preempting
Preempt -1 means it will try to acquire new task but not abort current task
Preempt -2 means it will acquire task at the cost of aborting current task
Preempt -3 says Preempt and Abort all, this definition is not clear to me, what is meant by all.

Kindly advise.

Regards
Shashank Trivedi

I don't know if 3 has ever really been used, but it means he will preempt his current task sequence, and abort all task sequences currently in his task sequence queue.

In addition to Anthony's answer

Originally Posted by shashanktrivedi

As far as i understand preempt definition, it is basically to acquire task before anyother operator takes it.

This is not exactly the right definition, it is the other way around, you force an taskexecuter to quit it's current task in favor of the new task.

I thought since this thread is titled Preempt Definition we should have a model to show the concept.

The model also demonstrates that you can get a TE to pass the job that was interrupted to another TE by connecting the "backup" TE to its output port. In other words, preemption will cause a TE to become a dispatcher of its current task sequence.

Note that when using a dispatcher you need to make sure that it will pass the preempting task sequence through to a resource that is already busy (not available).