--%>
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 : Advantage of wrapping database calls in

    What is the advantage of wrapping database calls in MTS transactions?

    		•
  • Q : Define Byte code Byte code : Java

    Byte code: Java source files are converted by a compiler into bytecodes that is, the instruction set of the Java Virtual Machine (JVM). The Bytecodes are stored in the .class files.

    		•
  • Q : Define Continue statement Continue

    Continue statement: A statement which might only be employed within the body of a loop. In case of a while loop or do loop, control passes instantly to the loop's terminating test. In case of a for loop, the control passes to the post-body update expr

    		•
  • Q : Who Issues Certificates and how Who

    Who Issues Certificates and How?

    		•
  • Q : Explain Return type Return type : It is

    Return type: It is the declared type of a method, appearing instantly before the method name, like void in     public static void main(String[] args)    or Point[] in 

    		•
  • Q : Define the term Address space Define

    Define the term Address space: The region of virtual memory in which a procedure is run.

    		•
  • Q : What is an Anonymous class Anonymous

    Anonymous class: It is a class formed without a class name. Such a class will be a sub class or an implementation of an interface, and is generally formed as an actual argument or returned as a method outcome. For example:

    Q : What is High level programming language

    High level programming language: Languages like Ada, Java, C++, and so on which give programmers with features like control structures, classes, methods, packages, and so forth. Such features are mostly independent of any specific instruction set, and

    		•
  • Q : What is Bounded repetition Bounded

    Bounded repetition: The Repetition where statements within a loop's body are executed a fixed number of times and the number of times is established whenever the loop began. There is no control structure in Java which guarantees the bounded repetition

    		•
  • Q : Define Constant Constant : It is the

    Constant: It is the memory block where value can be stored once although can’t modify later on throughout program execution. Example: const int pi =3.14;

    		•