--%>
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 : What is PIDs What is meant by the PIDs?

    What is meant by the PIDs?

    		•
  • Q : Define Mixed Mode Mixed Mode : Permits

    Mixed Mode: Permits domain controllers executing both Windows 2000 and prior versions of Windows NT to co-exist in the domain. In mixed mode, the domain features from prior versions of Windows NT Server are still allowed, whereas some Windows 2000 fea

    		•
  • Q : Define Indirect recursion Indirect

    Indirect recursion: Recursion which outcomes from method Y calling method X, whenever an existing call from X to Y is still in development or progress.

    		•
  • 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 Unions Unions: Unions in C and

    Unions: Unions in C and C++ are object overlays—aggregate quantities such as structs, except that each element of the union consists offset 0, and the total size of union is only as large as is required to hold its largest member (Kernighan and

    		•
  • Q : How is an external entity reference

    While constructing an XML DTD, how do you make an external entity reference within an attribute value?

    		•
  • Q : Define Class inheritance Class

    Class inheritance: Whenever a super class is expanded through a sub class, a class inheritance relationship exists among them. The sub class inherits the attributes and methods of its super class. Class inheritance in Java, is single

    		•
  • Q : Define Interpretational inner class

    Interpretational inner class: It is an inner class whose role is to give a view or interpretation of data belongs to its enclosing class, however independent of the data's real representation.

    		•
  • Q : Differences between XHTML and HTML

    Explain the differences between XHTML and HTML?

    		•
  • Q : What is HSB Color Model HSB Color Model

    HSB Color Model: A color model based on symbolizing a color as 3-components: hue, saturation and brightness. This is at times termed as the HSV color model - hue, saturation and value.

    		•