Skip to main content

Multitasking System

 Multitasking system

·         Technically , multitasking is same as multi programming

·         In a multitasking operating system, s single user can execute multiple programs at the same time

·         We can also say, multitasking is the system capability to work on more than one job or process at the same time.

·         It means that whenever a job needs to perform I/O operation, the cpu can be used for execting some other job

 


                                                     diagram of multi tasking

 

 

·         There are two type of multitasking :

1.       Cooperative multitasking

2.       Preemptive multitasking

 

·         Co operative multitasking  in cooperative multitasking , program can aquire the cpu for the required amount of time a program canshare CPU with any other program that is executing simultaneously, if it does not currently require the CPU.

 

·         Preemptive multitasking. In preemptive multitasking the operating system allocates particularly time to a program . the CPU is preempted if a higher priority job arrives in a system. 

single user operating system  

2.      Multi user operating system 

3.       Batch processing operating system

4.      Multi programming operating system 

5.     Multi tasking operating system 

6.       Multiprocessing operating system

7.       Time sharing operating system

8.     Real time system    

 Comparison between multi tasking and multi programming

 

 

Comments

Post a Comment

Popular posts from this blog

Service provided By An Operating System.

  List of five service provided by an operating system. Explain how  each provides convenience to users?     The main purpose of operating system is to provide environment for the execution of programs. Thus an operating system provides certain services to program and the users of those programs. However , different operating system can provide different set of service. Some of the basis services provided by operating system are: 1.         Program execution ·          Operating system provides a convenient environment where users can run their programs ·          The operating system performs memory allocation to programs, load them into appropriate location so that they can execute. The users need not to worry about all these tasks.   2.         I/O Operation ·        ...
Post a Comment
Read more

Multi user Operating System

  Multi user operating system ·           In a multi-user operating system, multiple number of user can access different resources of a computer at a same time. ·           The access is provided using a network that consists of various personal computer attached to a mainframe computer system.                                                              diagram of multi -user operating system       ·           The various personal computer can send and receive information to mainframe computer system. ·           The example    of multi-user OS are UNIX, windows 2000,novell netware.            sing...
Post a Comment
Read more

Application Of Threads

  Application Of Threads This section discuss various implementation of threads. Multithreading concepts are implemented by pthread (POSIX standard), solaris, linux, window 2000 and java. 1. POSIX THREAD(Pthreads) ·          Pthread refers to the POSIX standard(IEEE 1003.IC) that defines an API for thread creation and sychronisation. ·          Prior to the of POSIX THREADS, each hardware vendor implemented their own version of threads. ·          As each implemented from the other, writing portable multithreaded application was difficult. Thus POSIX standardize the API for thread management. ·          The current Pthread API is defined only for C programming language and it is implemented as function with a header file Pthread.h and thread library. ·          The naming...
Post a Comment
Read more

Multi Programming Operating System

  Multi programming  system ·           Multi programming operating system allows multiple users to execute multiple programs using a single CPU concurrently i.e. at the same time. ·           In multiprogramming several process are kept in the main memory and CPU execute all these processes concurrently. It means, the CPU immediately switches from one process to next that are ready to get executed ·           In such an operating system when one process start process start performing the instructions from several programs at the same time. ·           Rather, it means that there are number program available to CPU and that portion of one is executed, then segment of another and so on                                 ...
Post a Comment
Read more