Explain the communications of request or response interface, Operating System

Assignment Help:

Explain the Communications of Request or Response Interface

The inter-application communication must provide four specific interface to the CSInterface() components. A client must be able to send and receive from the server and the server must be able to receive from the client and return results. The communications interface must provide these generic services to the application layer while remaining transport independent at the bottom layer. Communications interface components may be required to perform more advanced functions than simple send and receive. First, it is their responsibility to mask the underlying protocols from the developer.

Second the communications interface must manage the modes of operation for CSInterface(). Our previous example of CSInterface() used CallServer() to communicate with the server computer. The client uses the CallServer() procedure to send request to the server in either synchronous or asynchronous mode:

  • In synchronous mode, client request will be returned upon receipt of results from the server.
  • In asynchronous mode, the CallServer() function will need to send the request to the server and immediately return.

 

Third, with the inclusion of callback procedures, the communications interface component must initiate the callback to the application- level code. Callbacks are most easily managed by including a pointer to the procedure in the REQHEADER for each CSInterface() call as documented in the previous section.

When the server returns the result of executed procedure, the communications interface can scan the REQHEADER for configured callbacks. If they exist, the communications interface should dispatch CSInterfaceSetupCallback() for setup and execution of the callback.


Related Discussions:- Explain the communications of request or response interface

Constructional techniques - copper clad circuit board, For the first assign...

For the first assignment you are required to construct a logic circuit onto a copper clad circuit board (vero board). This construction will require the use of planning the positio

Write a note on the usage of semaphores, Write a note on the usage of semap...

Write a note on the usage of semaphores. Semaphore is a synchronization tool and it is a variable having integer values. It is accessed only by two standard atomic operations w

Transferring files from windows to unix, Transferring files from Windows to...

Transferring files from Windows to Unix Be very careful transferring files from Windows to Unix. If you do transfer a file from Windows to Unix open the file, in Unix, using vi

Concepts of an address - data and control bus, Let us consider the operatio...

Let us consider the operation of the EPROM device in more detail. Consider the pining details below again   Before we examine the interface means of the EPROM, it is worth

Performance of job scheduling strategies, Performance of Job Scheduling  St...

Performance of Job Scheduling  Strategies In this project you will investigate the performance of Job Scheduling strategies, Memory Allocation strategies and a CPU Scheduling s

Define the os/2 threads code, Define the OS/2 threads code The sample p...

Define the OS/2 threads code The sample program in Listing is very similar to the NetWare example. OS/2 commands are substituted for the pseudocode commands controlling thread

Develop the material requirements plan, The following information is availa...

The following information is available for three MPS (Master Product Scheduling) items: Product A                            An 80 unit order is to be started in Week 3.

Evicting pages from physical memory, When do we write a page from physical ...

When do we write a page from physical memory back to the disk? In general, caches have two broad types of writing policies. One approach is a write-through cache. In this case,

Explain process termination - operating system, Process termination A p...

Process termination A process terminates when it finishes implementing its final statement and asks the operating system to delete it by using the exit system call. At that tim

Describe the technique of packing, Describe the technique of packing. T...

Describe the technique of packing. The physical record size will not accurately match the length of the desired logical record and the Logical records may even differ in length

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd