--%>
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 shell variables Explain the

    Explain the shell variables?

    		•
  • Q : Determine a web page element which

    How can I determine a web page element which contains exact text?

    		•
  • Q : Define Statement Statement : The

    Statement: The fundamental building block of Java method. There are numerous different kinds of statement in Java, for example, the assignment statement, if statement, while loop and return statement.

    		•
  • Q : Input and output formatting in C++

    Input output formatting in C++: C++ support

    		•
  • Q : CORBA allows high performance

    'CORBA was designed to allow high performance distributed applications to be written’. Discuss. Definitely, ’CORBA was designed to allow high performance distributed applications to be written’ because it provides:

    		•
  • Q : What is Namespace Namespace: It is the

    Namespace: It is the region of a program in which specific identifiers are visible. Java employs packages to give namespaces, and its visibility rules: package, private, protected, public-variously include identifiers within the namespaces.

    		•
  • Q : Explain Enumerated type Enumerated type

    Enumerated type: A data type-not directly accessible in Java - in which symbolic names are employed for a series of constant numeric values. They facilitate the evading of magic numbers. They can be simulated in the Java with fields i

    		•
  • Q : Define the term Return value Define the

    Define the term Return value: This is the value of the expression employed in a return statement.

    		•
  • 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 : BAT files and shell scripts Using the

    Using the Web as a resource for your investigation, find out and explain what BAT files and shell scripts contain, and what they are used for. In the light of your findings, discuss why an operating system would provide both a graphical user interface

    		•