--%>
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 : Cmp and diff commands Explain the

    Explain the difference between” cmp” and “diff” commands?

    		•
  • Q : Write the benefits of DLR Write the

    Write the benefits of DLR?

    		•
  • Q : Write a program and estimate pi using

    Consider a dartboard of radius 1. Since the area of the board will be  π r2 = π * 1 *1, it's clear the area of the dartboard is exactly π. The area of a square surrounding the board (circumscribing it) would be 2*2 = 4, sin

    		•
  • Q : Explain Message passing Message passing

    Message passing: We characterize the object interactions as message passing. The client object sends a message to a server object by invoking a technique from the server's class. Arguments might be passed with the message, and a outcome is returned by

    		•
  • Q : Define Peer Peer : It is a term

    Peer: It is a term employed of the Abstract Windowing Toolkit (AWT) to refer to the underlying classes which give the platform-specific implementation of the component classes.

    		•
  • Q : What is Runtime stack Runtime stack :

    Runtime stack: It is a stack structure maintained by the Java Virtual Machine which records that methods are presently being executed. The most of late entered technique will be at the top of the stack and the main technique of an application will be

    		•
  • Q : Generating uniform random numbers using

    In .NET, write a simple web service in C# to generate uniform random numbers. Use the class System.Random to generate the random numbers. What part of the code is specifically associated with web services? How could you deploy the web service?

    		•
  • Q : What are ORB-IOR-a servant-a POA manager

    In CORBA, what are i) an ORB ii) an IOR iii) a servant iv) a POA and v) a POA manager?

    		•
  • Q : Define Little-endian Little-endian : It

    Little-endian: It is a common difference among machines is the order in which they store up the individual bytes of multi-byte numerical data. The little-endian machine stores the lower-order bytes prior to the higher-order bytes.

    		•
  • Q : Explain Throw statement Throw statement

    Throw statement: It is a statement employed to throw an exception. For example:     throw new IndexOutOfBoundsException(i+" is too large.");

    		•