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Process Management

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PROCESS MANAGEMENT
b.1)
Multitasking is when there is two or more programs running at the same time and both are working. The processor will allocate some resources to each program. The processor switching back and forth between tasks so quickly that might look like the processor doing the two things at once. It is also means performing more than one process on a single CPU. Multiple processes are queued and wait for their turn to be executed on CPU, but it appears as if they are running in parallel. Each process provides the resources needed to execute a program and at least one thread of execution. A thread is entity within a process that can be scheduled for execution. Windows are supporting preemptive multitasking which creates the effect of simultaneous execution of multiple threads from multiple processes. To allow groups of processes to be managed as a unit, the job object is being used. The job objects are namable, securable, sharable objects that control attributes of the processes associated with them.
A multithreaded process can manage mutually exclusive tasks with threads, such as providing a user interface and performing background calculations. Creating a multithreaded process can also be a convenient way to structure a program that performs several similar or identical tasks concurrently. For example, a named pipe server can create a thread for each client process that attaches to the pipe. This thread manages the communication between the server and the client. The user process could use multiple threads to accomplish the following tasks: * Manage input for multiple windows. * Manage input from several communications devices. * Distinguish tasks of varying priority. For example, a high-priority thread manages time-critical tasks, and a low-priority thread performs other tasks. * Allow the user interface to remain responsive, while allocating time to background tasks
For Unix-like operating system, they were developed from the start as preemptive multitasking and multi-user systems. These are among the features that have helped make them an extremely efficient and robust (as well as highly successful and long-lived) family of operating systems. (They are also multiprocessor operating systems, which mean that they can make effective use of computers that have more than a single CPU.)
Multiple processes exist for virtually the entire duration of a Linux session, even if no user application programs are running. The only exception is a very brief period during booting (i.e., starting up of a computer), when init, which is the first process to be created on a newly booted system, has not yet spawned additional processes. Multitasking can be easily observed in Unix-like operating systems when the X Window System (i.e., the standard system for managing GUIs on single computers and on networks of computers) is used. That is, multiple windows can be simultaneously open on the display screen, each with an application program running independently of the others. The independence of these applications is evidenced by the fact that, as experienced Linux users are well aware, even if one of the applications crashes, it is very rare that it will cause other applications to malfunction or cause the system as a whole to crash (and thus require rebooting). While not quite as obvious, especially to new users, multitasking is also occurring when a Unix-like system is operating in console (i.e., text only) mode. That is, different programs can be operating on different virtual consoles. Moreover, multiple programs can also operate on a single console or terminal window (i.e., a window in a GUI that emulates console mode) by having one program run in the foreground while others are running in the background.

b.2 REFFERENCES 1. http://www.linfo.org/multitasking.html 2. http://wiki.answers.com/Q/What_is_multitasking 3. http://msdn.microsoft.com/en-us/library/windows/desktop/ms681940(v=vs.85).aspx 4. http://msdn.microsoft.com/en-us/library/windows/desktop/ms687084(v=vs.85).aspx

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