An Interface Algebra for Real-Time Components

We present an assume-guarantee interface algebra for real-time components. In our formalism a component implements a set of task sequences that share a resource. A component interface consists of an arrival rate function and a latency for each task sequence, and a capacity function for the shared resource. The interface specifies that the component guarantees certain task latencies depending on assumptions about task arrival rates and allocated resource capacities. Our algebra defines compatibility and refinement relations on interfaces. Interface compatibility can be checked on partial designs, even when some component interfaces are yet unknown. In this case interface composition computes as new assumptions the weakest constraints on the unknown components that are necessary to satisfy the specified guarantees. Interface refinement is defined in a way that ensures that compatible interfaces can be refined and implemented independently. Our algebra thus formalizes an interface...

• Type: Conference
• Year: 2006
• Where: RTAS
• Authors: Thomas A. Henzinger, Slobodan Matic
• Keywords: Assume-guarantee Interface Algebra, Component Interfaces, Real-Time Technology, RTAS 2006, Task Sequence