Model Parts, Diagrams, Dictionary Items, and Properties > Dictionary items > Task (dictionary item)
Task (dictionary item)
For automation interface information about a Task, see Task (automation interface).
A Task describes a group of objects that have a common thread of control. The thread of control consists of a series of Operations that may contain iterations and selections.
You can create a Task through the context menu of a Package: right-click the Package, and select New > Proprietary > Concurrency > Task. In addition, you can create a Task through a Concurrency Diagram.
When used on a diagram, a Task's notation is as follows:
In the Modeler panes, a short-cut symbol on the Task's icon indicates that the item is a stub.
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If you select the Proprietary\Tasks folder in the Dictionary pane, the Contents pane displays the following information about each Task in the model: Worst Case Execution Time, Frequency and Priority.
The following sections provide information about how a Task is used in the model. For more information about a property, item, model part or diagram, click it.
Properties
In addition to the standard properties, a Task has these properties:
• Interrupt Handler — (Is Interrupt Handler through the automation interface)
• IRQ
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The Class box on the Options tab of a Task's Property Pages shows the Class, Data Type or Interface that owns the Operations that implement the Task.
Owned by
Model
Package
Owns
Comment
Constraint
Dependency — The Dependency is owned jointly by the Task and the other associated item. The access permissions you have to a Dependency are determined by the access permissions of the dependent item.
Defined in these parts of the model
Concurrency Model
Used in:
System Architecture Model
Shown on these diagrams
Concurrency Diagram
Variant Diagram
Can be linked to these dictionary items
In addition to the owning Package or Model, a Task can be linked to the following items.
Board
Class — The linked Class contains the Operations required to implement the Task (drag Class to Task symbol on diagram).
Data Type — The linked Data Type contains the Operations required to implement the Task (drag Data Type to Task symbol on diagram).
Interface — The linked Interface contains the Operations required to implement the Task (drag Interface to Task symbol on diagram).
Stereotype
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Task concurrency model
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