--%>
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 : Define Case sensitive Case sensitive :

    Case sensitive: The test which is sensitive to whether a character is in upper-case (example, 'A') or lower-case (example, 'a').

    		•
  • Q : What is Catch clause Catch clause : It

    Catch clause: It is a part of a try statement accountable for handling the caught exception.

    		•
  • Q : Describe Method result Method result :

    Method result: The value returned from a method through a return statement. The kind of expression in the return statement should match the return type declared in method header.

    		•
  • Q : Subroutine in the programming Describe

    Describe the number of ways that an argument is passed to a subroutine in the programming?

    		•
  • 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 : State the term multi threading State

    State the term multi threading.

    		•
  • Q : What is an Arithmetic expression

    Arithmetic expression: It is an expression comprising numerical values of integer or floating point kinds. For example, operators like +, -, *, / and % get arithmetic expressions as their operands and generate arithmetic values as their outcomes.

    		•
  • Q : Problem on COBOL if sentence Write a

    Write a COBOL IF sentence to use the values of numeric variables EXAM and COURSEWORK, both assumed to be with format PIC 999 and in the range 0 to 100 and to move the value:“FAIL”, “RC” ( resit coursework), “RE” (r

    		•
  • Q : Examples of applications which can

    Give some examples of applications which can benefit from using XML?

    		•
  • Q : Define Octal Octal : Number

    Octal: Number representation of octal is base 8. In base 8, simply the digits 0 to 7 are employed. Digit positions symbolize successive powers of 8.

    		•