--%>
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 : Meaning of SBI of an object in the

    Describe the meaning of SBI of an object in the programming?

    		•
  • Q : Explai phases of software development

    Define the difference between phases of software development or software life cycle?

    		•
  • 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.

    		•
  • Q : Define Hardware Hardware : It is the

    Hardware: It is the physical devices of a computer system, like its micro-chips, keyboard, disk drives, printer, sound card, and so forth. It is termed `hardware' in contrary to programs, which are termed `software'.

    		•
  • Q : CSS and CSS3 State some of the

    State some of the difference between the CSS and the CSS3.

    		•
  • Q : Explain Look-and-feel Look-and-feel :

    Look-and-feel: The visual impression and interaction style given by a user interface. This is mainly the responsibility of the window manager (that is, in collaboration with the fundamental operating system) running on a specific computer. This refers

    		•
  • Q : State Space Reduction in Java PathFinder

    State Space Reduction: JPF is a so-called explicit-state model checker, as it enumerates all visited states, and therefore suffers from the state explosion problem inherent in analyzing large programs. It also contains garbage collection, because a ty

    		•
  • Q : What is Common Gateway Interface Common

    Common Gateway Interface: The Common Gateway Interface (abbreviated as CGI) is a standard which permits Web clients to interact with programs on Web server. The CGI script is on the server and is able to process arguments or input from a client, and r

    		•
  • Q : Assembly condition codes What do you

    What do you mean by the term assembly condition codes?

    		•
  • Q : Explain Declaration and initialization

    Declaration and initialization: It is a statement in which a variable is declared and instantly given its initial value. Three illustrations of declaration and initialization are as follows:     int

    		•