--%>
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 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 : What is Signal Handler Signal Handlers:

    Signal Handlers: In some operating systems, signal handlers are executed on a thread stack; they “overlay” the current thread execution (which may be used, for example, in combination with setjmp/longjmp to create user-domain lightweight t

    		•
  • Q : Attatching CSS to HTML documents

    Explain the different ways in order to attach the CSS to HTML Documents?

    		•
  • Q : What do you mean by java Swing What do

    What do you mean by the term java Swing? Describe in brief.

    		•
  • Q : What is an Implicit type conversion

    Implicit type conversion: The type conversion which does not need a cast. Implicit type conversions usually do not comprise any loss of information. For example, joining an integer operand with a floating point operand in an arithmetic expression will

    		•
  • Q : What is Pop-up menu Pop-up menu : A

    Pop-up menu: A menu of actions which is generally not visible on the screen till a mouse button is clicked. The Popup menus assist to keep a user interface from becoming cluttered.

    		•
  • Q : What is an Exception handler Exception

    Exception handler: It is a try statement which acts as an exception handler - a place where exception objects are dealt and caught with.

    		•
  • Q : What is Cascading if-else statement

    Cascading if-else statement: A form of if-else statement in which all else-part (apart from the last) comprises of a further nested if-else statement. Employed to overcome the trouble of textual drift frequently related with nested if statements.

    		•
  • Q : Platform security of S60 third Edition

    How do I know that platform security abilities my S60 3rd Edition application needs?

    		•
  • Q : Simple Sorting Program in C Shell

    Assignment: Sorting You will write a simple sorting program. This program should be invoked as follows: shell% ./fastsort -i inputfile -o outputfile

    		•