In UML models, you can specify the concurrency property
of an operation in an active object to determine how a system behaves
when the operation is called by another active object.
To set the concurrency property of an operation:
- In the diagram editor, click an operation.
- In the Properties view, click the Advanced tab.
- On the Advanced page, in the Property column,
expand UML.
- In the Property column, click Concurrency.
- Beside Concurrency in the Value column,
click a value.