OPERATING SYSTEM OBEJECTIVE2

OPERATING SYSTEM CONCEPT


Job Control Language (JCL) are used to Specify, to the operating system, the beginning and end of a job in a batch.

Boundary registers   track the beginning and ending of programs

Round-robin scheduling gives each task the same chance at the processor

Four necessary conditions for deadlock to exist are: mutual exclusion, no-preemption, circular wait and hold and wait

Page-map table is used for address translation

Dispatcher assigning ready process to the CPU

The table created by lexical analysis to describe all literals used in the source program, is Literal table

The term 'polling' in a computer means a process by which a computer system  inquires to see if a terminal has any transaction to send

File record length should be chosen to match the data characteristics

Terminal Table a permanent table which lists all key words and special symbols of the language in symbolic form

Round-robin  is a pre-emptive scheduling algorithm.

Paging  is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.

Scheduling is allowing jobs to use the processor.

Semaphores  synchronize critical resources to prevent deadlock

OPERATING SYSTEM OBEJECTIVE

OPERATING SYSTEM CONCEPTS

Preemptive sheduling is one in which the current executing process is suspended and another process is executed and suspended process is resumed.

Thrashing occurs due to the quick paging in small intervals. So the CPU waste time in paging activity rather doing actual work

A diamond indicates a point where a decision is made like yes/no, no/go, etc.

Locality of reference, also known as the principle of locality, is the phenomenon of the same value or related storage locations being frequently accessed.

"Lexical analysis" is associated with recognition of basic elements and creation of uniform symbols

Page stealing is taking page frames from other working sets

Bug means A logical error in a program

Memory management is replaced with virtual memory on current systems

Spooling- The process of transferring data intended for a peripheral device into a disk (or intermediate store) so that it can be transferred to peripheral at a more convenient time or in bulk.

Seeks analysis is used for analyzing device busy problems

What problem is solved by Dijkstra's banker's algorithm?

Ans-deadlock avoidance

Swapping allows each program in turn to use the memory

A translator is best described as a system software

A Processor  is a device that performs a sequence of operations specified by instructions in memory.

A translator which reads an entire programme written in a high level language and converts it into machine language code is Compiler


     Operating System Concept 2

HOW TO DELETE TIMELINE FROM FACEBOOK

1.GO TO FACEBOOK.COM
2.LOGIN TO YOUR ACCOUNT.
3.NOW GO TO developers.facebook.com.
4.CLICK ALLOW.
5 THEN CLICK ON APPS.
6.ON LEFT SIDE CLICK ON "DELETE APP".
7.CLICK CONFERM.
8.THATS IT YOU ARE BACK TO YOUR OLD PROFILE.

NOTE-FACEBOOK have made changes currently so now once you have timeline you cannot get back to your old profile

                       

HOW TO ADD TIMELINE TO FACEBOOK

1.  GO TO FACEBOOK. (www.facebook.com)
2.  LOGIN WITH EMAIL ID AND PASSWORD.
3.  GO TO http://www.facebook.com/GetYourTimeline.
4.  LIKE THIS PAGE

5.CLICK ON GET TIMELINE.

6.THATS  IT ,NOW ENJOY YOUR FACEBOOK ACCOUNT WITH THIS NEW TIMELINE.

        

 HOW TO REMOVE TIMELINE CLICK HERE

Shut Down Computer with Cell Phone.........

Shutting down the PC from your cell phone. 

Follow the simple tricks below......

The Following trick makes it very easy for anyone to shutdown their pc’s remotely.

The requirements are simple
One cell phone with GPRS enabled, Microsoft Outlook on the pc to be put to shutdown.

Using this method the user can shutdown, restart, hibernate the computer just by sending an email from their cell phone.

All you need to have is Microsoft outlook which comes with Microsoft word. The Microsoft outlook should be installed on the pc you wish to shutdown.

First you need to create a batch file to perform shutdown etc .you can write them down yourself.

* Open your notepad and type the following

c:\windows\system32\shutdown -s -f -t 00

And save it as shutdown.bat (Executable file)

* Open up Microsoft outlook .make sure that it is already configured for you email id.
* Now we will need to set Microsoft outlook in such a way that outlook checks you email every one minuite.This can be set by going to tools-à options
* Then click the mail setup tab and later send/receive button
* Make sure that you schedule an automatic send/receive...every box checked and set the number of minutes to 1.Now you may close all these dialog boxes
* Now go to tools---rules and alert. Next click on options button on the upper right hand corner and press the import rules button



* Now click on the shutdown.bat which you recently created
* Now the final step
* When you send the message from your phone to your email address with a subject shutdown or smsshutdown%% ......and see your computer is shutdown….