--%>
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 First in-first out First in,

    First in, first out: It is FIFO semantics of the queue data structure. Items are eliminated in the order in which they arrived in the queue; therefore older items are always eliminated before newer ones.

    		•
  • Q : Define Implements clause Implements

    Implements clause: That part of a class header which points out which interfaces are applied by the class. A class might implement for more than one interface.

    		•
  • Q : Technologies are used in AJAX Name the

    Name the technologies that are used in AJAX?

    		•
  • Q : Define Sign bit Sign bit : In

    Sign bit: In 2s-complement notation, the most important bit in an integer value is employed to determine the sign of the value. A 1-bit point out a negative number and a 0 bit point out a positive number.

    		•
  • Q : Describe Throw an exception Throw an

    Throw an exception: Whenever an exceptional circumstance occurs in a program - frequently as an outcome of a logical error and exception object is formed and thrown. When the exception is not caught by an exception handler, the program will finish wit

    		•
  • Q : Define Fully evaluating operator Fully

    Fully evaluating operator: An operator which computes all of its arguments to generate an outcome. Standard arithmetic operators, like +, are totally evaluating. In contrary, some Boolean operators, like &&, are short-circuit operators.

    		•
  • Q : State term System call executable

    State the term System call executable binary file in a process.

    		•
  • Q : What does WSDL stand for What does WSDL

    What does WSDL stand for?

    		•
  • Q : Main purpose of Child Header files

    Illustrate what is the main purpose of Child Header files?

    		•
  • Q : What is Left shift operator Left shift

    Left shift operator: Left shift operator (<<) is the bit manipulation operator. This moves the bits in its left operand zero or additional positions to the left, according to the value of its right operand. The zero bits are added up to the righ

    		•