--%>
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 : Monte Carol method to estimate pi An

    An interesting way to estimate pi can can done using Monte Carol method with minimal mathematics. Monte Carlo is known for its casinos. A Monte Carlo method uses change, or in our case, random numbers to simulate the real situation. The situation we simulate here is t

    		•
  • Q : Define Continuous simulation Continuous

    Continuous simulation: In a continuous simulation, the time ticks past at a regular rate which is applicable to the specific simulation scenario. At each and every tick, all the objects in the simulation are informed of the passage of time and updated

    		•
  • Q : Explain Enumerated type Enumerated type

    Enumerated type: A data type-not directly accessible in Java - in which symbolic names are employed for a series of constant numeric values. They facilitate the evading of magic numbers. They can be simulated in the Java with fields i

    		•
  • Q : What is a Sub class Sub class : It is a

    Sub class: It is a class which extends its super class. The sub-class inherits all the members of its super class. All Java classes are the sub-classes of Object class, which is at the root of inheritance hierarchy.

    		•
  • Q : Explain Upcast Upcast: It is a cast

    Upcast: It is a cast towards an object's ultimate super type - which is, `up' the inheritance hierarchy towards the Object class, for example:         // Upcast from VariableContr

    		•
  • Q : Use Finite-State Space Abstractions Use

    Use Finite-State Space Abstractions: In order to successfully apply explicit-state model checking, defects must be detectable in a sufficiently small state space. This can be achieved either by means of heuristics that constrain the way the state spac

    		•
  • Q : Define Short-circuit operator

    Short-circuit operator: It is an operator in which only as a lot of operands are computed as are required to determine the final outcome of the operation. The logical-and (&&) and logical-or (||) operators are most general illustration, though

    		•
  • Q : Define the term Module Module : It is a

    Module: It is a group of program components, usually with restricted visibility to program components in other modules. Java employs packages to implement this perception.

    		•
  • Q : What is Round robin allocation Round

    Round robin allocation: It is an allocation of time slices which repeatedly cycles regarding a set of eligible threads in the fixed order.

    		•
  • Q : State the term URL path State the term

    State the term URL path?

    		•