--%>
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 Exclusive-or operator

    Exclusive-or operator: An exclusive-or operator (^) is both a Boolean operator and the bit manipulation operator. The Boolean version provides the value true when only one of its operands is true; or else it offers the value false. Likewise, the bit m

    		•
  • Q : Define Bounds Bounds : It is the limits

    Bounds: It is the limits of an array or collection. In Java, the lower limit is for all time zero (0). In case of an array, the upper bound is one less than the length of the array, and is fixed. Indexing exterior the bounds of an array or collection

    		•
  • Q : Types of validation controls of ASP.NET

    List the types of validation controls that are available in the ASP.NET AJAX 4.0?

    		•
  • Q : Define the term createWindow object

    Define the term createWindow object? Answer: reateWindow() physically makes the Window in memory  based upon the earlier registered WND

    		•
  • Q : Source and listener What do you mean by

    What do you mean by the term source and listener?

    		•
  • Q : Explain Return statement Return

    Return statement: It is a statement employed to terminate the execution of the method. The method with void return type might only have return statements of the form as: return;

  • Q : How can you explain basic elements of

    How can you explain basic elements of WebServices?

    		•
  • Q : What is a Real-Time System What is a

    What is a Real-Time System?

    		•
  • Q : Explain Method overriding Method

    Method overriding: It is a method stated in a super class might be overridden by a method of similar name stated in a sub class. The two methods should have similar name and number and types of formal arguments. Any checked exception thrown by sub-cla

    		•
  • Q : What is Break statement Break statement

    Break statement: A statement employed to break out of a loop, switch statement or labeled block. In all situations, control continues with the statement instantly, subsequent to the containing block.

    		•