--%>
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 an Anonymous array Anonymous

    Anonymous array: It is an array formed without an identifier. The anonymous array is generally formed as an actual argument, for example:// generate an anonymous array of integers.    YearlyRainfall y2k = new YearlyRai

    		•
  • Q : What is applet? Explain life cycle of

    Ans. Applet: An applet is an application designed to travel over the internet and to be executed on the client machine by a java compatible

    		•
  • Q : How is an XPointer processor configured

    How is an XPointer processor configured?

    		•
  • Q : Assembly program that reads in five

     I need to write assembly program that reads in five numbers from the user. The user can then be prompted for one of the following pieces of information to be computed and returned: . the mean of the five numbers; . the largest number in the set; . the smallest number in the set; . t

    		•
  • Q : One-time signature scheme Define

    Define one-time signature scheme?

    		•
  • Q : What is an Exception handler Exception

    Exception handler: It is a try statement which acts as an exception handler - a place where exception objects are dealt and caught with.

    		•
  • Q : Write a program that prints out 20

    Write a program that prints out 20 random cards form a standard deck of 52 cards. Make sure the program prints out different sets of cards from one run to the next.

    		•
  • 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 the computer thread Explain the

    Explain the computer thread.

    		•
  • Q : Perform Exception Handling with

    On occasion, some of Brewbean’s customers mistakenly leave an item out of a basket already checked out, therefore they create a new basket containing the missing items. Though they request that the baskets be combined and hence they are not charged extra shippin

    		•