1. WHAT IS MULTITASKING? - is a method by which multiple tasks, also known as processes, share common processing resources such as a CPU. In the case of a computer with a single CPU, only one task is said to be running at any point in time, meaning that the CPU is actively executing instructions for that task -solves problems by scheduling which task may be the one running at any given time, and when another waiting task gets a turn. The act of reassigning a CPU from one task to another one is called a context switch. iPhone multitasking

3. In time-sharing systems, the running task is required to relinquish the CPU, either voluntarily or by an external event such as a hardware interrupt. Time sharing systems are designed to allow several programs to execute apparently simultaneously. The expression 'time sharing' was usually used to designate computers shared by interactive users at terminals, such as IBM's TSO, and VM/CMS

7. The earliest preemptive multitasking OS available to home users was Sinclair QDOS on the Sinclair QL, released in 1984. The Commodore Amiga 1000 released in 1985 (demonstrated by Debbie Harry and Andy Warhol at its unveiling) made use of a preemptive multitasking kernel that performed the circus act without a net (MMU) while managing a coprocessor that could process 80 instructions per scan line — no other computer on the market could touch it at the time, which was the sole reason the NewTek Video Toaster was developed to make use of its features. Microsoft made preemptive multitasking a core feature of their flagship operating system when developing Windows NT 3.1 and Windows 95. It was later adopted on the Apple Macintosh by Mac OS 9.x as an additional API, i.e. the application could be programmed to use the preemptive or cooperative model, and all legacy applications were multitasked cooperatively within a single process. Mac OS X, being a Unix-like system, uses preemptive multitasking for all native applications, although Classic applications are multitasked cooperatively in a Mac OS 9 environment that itself is running as an OS X process (and is subject to preemption like any other OS X process).

8. Real time Another reason for multitasking was in the design of real-time computing systems, where there are a number of possibly unrelated external activities needed to be controlled by a single processor system. In such systems a hierarchical interrupt system was coupled with process prioritization to ensure that key activities were given a greater share of available process time.

9. Example of Multitasking MultiFinder In computer science, is a version of the Apple Macintosh that provides support for multitasking. It allows multiple application to be simultaneously resident in memory. A single mouse click switches between applications, and information from one application can be copied to another.

10. Advantages of Multitasking -To the user, the advantage of multitasking is the ability to have several applications open and working at the same time. For example, a user can edit a file with one application while another application is recalculating a spreadsheet. -To the application developer, the advantage of multitasking is the ability to create applications that use more than one process and to create processes that use more than one thread of execution. For example, a process can have a user interface thread that manages interactions with the user (keyboard and mouse input), and worker threads that perform other tasks while the user interface thread waits for user input. If you give the user interface thread a higher priority, the application will be more responsive to the user, while the worker threads use the processor efficiently during the times when there is no user input.

13. Project in TLE Prepared by: LiezlAlo Bret John Darato Of III-Dalton