20 - Modifications from previous releases

20.1 - Semaphore manipulation

20.1.1 V1.0 to V1.1

The semaphore take now returns a status that indicates if the take attempt timed out or was successfull. The semaphore lifeline gets grayed when the semaphore is unavailable.

20.2 - Object orientation

20.2.1 V1.1 to V1.2

There has been an error in the object orientation chapter: it is not possible to declare a process class or a block class in a block class definition diagram.

20.2.2 V1.2 to V2.0

• UML class diagram has been introduced
• UML deployment diagram has been introduced
• Object creation symbol introduced in the behavior diagram

20.2.3 V2.1 to V2.2

• Super class transition symbol added
• Super class next state symbol added

20.3 - Messages

20.3.1 V1.1 to V1.2

• Messages now needs to be declared.
• Message parameters are now typed with C types.
• Parameter length can be omited if the parameter is structured. Then the length is implicitly the sizeof the parameter type.
• The VIA concept has been introduced.

20.3.2 V2.0 to V2.1

• Messages can have multiple parameters. Declaration, inputs, and outputs have changed.

20.4 - MSC

20.4.1 V1.1 to V1.2

• Saved messages representation introduced.

20.4.2 V2.2 to V2.3

• Inline expressions support added.
• Property Sequence Charts (PSC) support added.
• Change in MSC diagram DTD for textual representation.

20.5 - Task

20.5.1 V1.2 to V2.0

STACK parameter has been added as a parameter when creating a task.

20.6 - Organisation

20.6.1 V1.2 to V2.0

Chapters have been re-organized.

20.7 - New concept

20.7.1 V2.1 to V2.2

"Composite state" has been introduced

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