--%>
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 : Explain Object reference Object

    Object reference: It is a reference to an object. Languages other than Java employ terms like pointer or address or. It is significant to keep the difference clear between an object and its reference. The variable like argo

    Q : Explain the relationship between XHTML

    Explain the relationship between XHTML and SGML.

    		•
  • Q : Problem on three dimensional diagram of

    Create a three dimensional diagram of function z = (x-2)2 + (y-3)3.

    		•
  • Q : Define Parallel programming Parallel

    Parallel programming or parrelel computing is the concurrent use of multiple compute resources to resolve a specified problem. Parallel program always comprises of concurrently executing processes, problem decomposition relates to the manner in which

    		•
  • Q : Monte Carol method to estimate pi An

    An interesting way to estimate pi can can done using Monte Carol method with minimal mathematics. Monte Carlo is known for its casinos. A Monte Carlo method uses change, or in our case, random numbers to simulate the real situation. The situation we simulate here is t

    		•
  • Q : Define Main method Main method : It is

    Main method: It is the beginning point for program execution public static void main(String[] args)

    		•
  • Q : Define the term Punctuation Define the

    Define the term Punctuation: Symbols like commas and semicolons that a compiler employs to understand the structure of the program.

    		•
  • Q : Explain Downcast with example Explain

    Explain Downcast with example: It is a cast towards an object's dynamic kind - that is, `down' the inheritance hierarchy. For illustration:        // Downcast from Object to String

    		•
  • Q : Define the term Toggle Define the term

    Define the term Toggle: To alternate among two values, like true and false, on and off, or 1 & 0.

    		•
  • Q : Explain Twos-complement notation

    Twos-complement notation: In twos-complement notation, the most noteworthy bit in an integer value is employed as the sign bit. A 1 bit points out a negative number, and a 0 bit points out a positive number. The positive number can be transformed to i

    		•