Preempt Task Sequence

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JP117 asked Mar 6, '25 Jeanette F commented Mar 14, '25

Preempt Task Sequence

I have a simple process flow that I want to use in a larger model, and it seems like the preempt, abort all option is not working unless I use priorities. I thought that this would kill all tasks and allow me to create a new travel sequence. Why do you still need to use priorities with this option. This code is going to be part of a loop and there could be several of these redirects so assigning priorities will be difficult

In the model a person walks to a target location once he is within 20 meters of the target he is redirected somewhere else

Preempt Example.fsm

Software Version:

FlexSim 24.2.2

tasksequences preempting

preempt-example.fsm (36.6 KiB)

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Jeanette F ♦♦ commented · Mar 14 at 04:43 PM

Hi @JP117, was Felix Möhlmann's answer helpful? If so, please click the "Accept" button at the bottom of their answer. Or if you still have questions, add a comment and we'll continue the conversation.

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Answer 1 · 2025-03-06T19:14:57Z

Felix Möhlmann answered Mar 6, '25 Felix Möhlmann commented Mar 6, '25

Task sequences are split into two groups: non-preempting and preempting. A preempting task sequence can interrupt/abort a non-preempting task sequence regardless of priority. However to preempt another preempting TS the priority needs to be higher.

To always have priority you can read the priority value of the currently active task sequence and use a priority value that is 1 higher when creating the new sequence.

token.Operator.as(TaskExecuter).activeTaskSequence.priority

Or you do the opposite and reduce the priority and/or preempt setting of the current task sequence before dispatching a new one.

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JP117 commented · Mar 06 at 07:37 PM

Thanks, how do I check to see if the operator has an active task sequence first?

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Felix Möhlmann JP117 commented · Mar 06 at 08:17 PM

I'd use objectexists(teReference .activeTaskSequence ). If you are not setting them manually then checking the state (idle or not) can also work.

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