CS370 HW1 - Ryan Reckard Feb. 09, 2008 CS370 I. Questions...

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Ryan Reckard Feb. 09, 2008 CS370 I. Questions based on the text and research (10 points) The goal of this part is to make sure you understand the main concepts (in terms of what, why, when, and how) in the chapter. Describe the need for short-term, medium-term, and long-term scheduling. How do these scheduling mechanisms differ? Different term scheduling is needed for different reasons. For example, the short-term scheduler selects which process should be executed next and allocates CPU, and the long-term scheduler selects which processes should be brought into the ready queue. Describe the difference between user and kernel mode execution. User and Kernal mode execution differs by what the 'user' is allowed to access and run. User is allowed to view system time, for example; whereas, the kernal mode execution is allowed to change the system time. When does a process typically run in kernel mode? Which code typically gets executed in kernel mode? Usually when the process accesses system files and Operating System files
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CS370 HW1 - Ryan Reckard Feb. 09, 2008 CS370 I. Questions...

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