--%>
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 Infinite recursion Infinite

    Infinite recursion: Recursion which does not finish. This can effect from any of direct recursion, indirect recursion or the mutual recursion. It is generally the outcome of a logical error, and can consequence in stack overflow.

    		•
  • Q : Explain Constructor Constructor : A

    Constructor: A constructor is automatically called whenever an instance of its class is formed. A constructor always has similar name as its class, and encompass no return type. For example: public

    		•
  • Q : Overriding a base class method in

    Explain the way to overriding a base class method in Visual Studio .NET and in Visual Studio 2005.

    		•
  • Q : Explain the difference between the

    Explain the difference between the Interpreter and Compiler?

    		•
  • Q : Explain Throws clause Throws clause :

    Throws clause: It is a clause in a method header pointing that one or additional exceptions will be propagated from this technique. For example:    public int find(String s) throws NotFoundExc

    		•
  • Q : Define Reserved word Reserved word : It

    Reserved word: It is a word reserved for a particular purpose in Java, like: class, int, public, and so forth. These words might not be employed as ordinary identifiers.

    		•
  • Q : Define Stream class Stream class : An

    Stream class: An input stream class is one which delivers data from its source (frequently the file system as a series of bytes. Likewise, an output stream class will write byte-level data. The stream classes must be contrasted with the operation of r

    		•
  • Q : What is decimal Decimal: The number

    Decimal: The number representation in decimal is base 10. In base 10, the digits 0 to 9 are utilized. Digit positions symbolize successive powers of 10.

    		•
  • Q : Pointer in C What is pointer? What

    What is pointer? What significance of pointer in C programming languages?

    		•
  • Q : Program to Calculate Estimate

    Collaboration Policy Collaboration between students on programming assignments is NOT allowed under any circumstances - you may not even discuss your work with other

    		•