--%>
Assignment Help - homework help

Modeling Language for SPIN-Promela

Modeling Language: The modeling language used for SPIN is called Promela (Process Meta Language). In fact, the name SPIN stands for Simple Promela Interpreter. Promela is a powerful C-like specification language with a variety of synchronization primitives that enables construction of models of distributed systems. Promela is a guarded command language for specifying possibly non-deterministic system behaviors in a distributed system design. It allows for the dynamic creation of concurrent processes which communicate synchronously or asynchronously via message channels.

For example, the following Promela specification describes two processes P and Q that synchronize over a critical region.

2110_promela1.jpg

A Promela model consists of declarations of types, channels, variables, and processes, as well as facilities for initializing the processes. For example,

2359_promela2.jpg

A model consists of a set of concurrent processes, each in turn consisting of a set of atomic guarded actions or transitions. An action whose guard is true is called enabled and can be executed; otherwise, it is disabled and cannot be executed. Actions are not really executed concurrently; rather, they are non-deterministically interleaved, and this is used to model concurrency. Also processes do not have to terminate, which is useful when modeling reactive systems.

   Related Questions in Programming Languages

  • Q : Define the term Identifier Define the

    Define the term Identifier: It is a programmer-defined name for a method, variable, class and interface.

    		•
  • Q : How much does Symbian Signed

    How much does Symbian Signed certification and testing cost? Answer: Test houses contain their own prices for Symbian Signed testing. So you can check that prices through searching over the internet.

    		•
  • Q : Define the term Mutual recursion Define

    Define the term Mutual recursion: Recursion which outcomes from two methods calling one other recursively.

    		•
  • Q : How can we start Array Index from Zero

    How can we start Array Index from Zero?

    		•
  • Q : Define Abstract class Abstract class :

    Abstract class: It is a class with the abstract reserved word in its header. The Abstract classes are differentiated by the fact that you might not directly construct objects from them employing the new operator. The abstract class might have zero (0)

    		•
  • Q : Double clock signal in synchronous

    Describes the cases where you need to double clock a signal before presenting this to a synchronous state machine?

    		•
  • Q : What is a Pipe Pipe : It is a linkage

    Pipe: It is a linkage between the two program components. One component responds as a source of data, and writes into the pipe. The second components act as a receiver (that is, sink) for the data and reads from pipe.

    		•
  • Q : Define process group Define the process

    Define the process group?

    		•
  • Q : What is a Port Port: It is a number

    Port: It is a number employed by a procedure to communicate with the other procedure across a network, employing the Transmission Control Protocol (abbreviated as TCP) or User Datagram Protocol (abbreviated as UDP), for instance.

    		•
  • Q : Describe Real number Real number : It

    Real number: It is a number with an integer and a fractional portion. The primitive types double and float are employed to symbolize real numbers.

    		•