Stateflow

Directed Event Broadcasting

You can specify a directed event broadcast in the action language. Using a directed event broadcast, you can broadcast a specific event to a specific receiver state. Directed event broadcasting is a more efficient means of synchronization among parallel (AND) states. Using directed event broadcasting improves the efficiency of the generated code. As is true in event broadcasting, recursive event broadcasts can lead to definition of cyclic behavior.

Note    An action in one chart cannot broadcast events to states defined in another chart.

The format of the directed broadcast is

• send(event_name,state_name)
  

where event_name is broadcast to state_name (and any offspring of that state in the hierarchy). The state_name argument can include a full hierarchy path. For example,

• send(event_name, chart_name.state_name1.state_name2)
  

The state_name specified must be active at the time the send is executed for the state_name to receive and potentially act on the directed event broadcast.

Directed Event Broadcast Using send Example

This is an example of a directed event broadcast using the send(event_name,state_name) transition action as a transition action.

In this example, event E_one must be visible in both A and B. See Directed Event Broadcasting Using Qualified Event Names Example for information on the semantics of this notation.

Directed Event Broadcast Using Qualified Event Names Example

This example illustrates the use of a qualified event name in the event broadcast of the previous example.

See Directed Event Broadcasting Using Qualified Event Names Example for information on the semantics of this notation.

Broadcasting Events

Condition Statements