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os05-1st_100 - 1 Operating System 1st Exam for 2005 Fall...

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1 Operating System 1st Exam. for 2005 Fall Semester Date: 10-19-2005, Time: 09:10 a.m.- 10:40 a.m. Name: Student ID: Dept: There are 9 problems in this examination. The weights for each (sub)problem is indicated. Please do all of them. 1. [Basic Concepts] These are 10(a-j) true or false problems. If your answer is false please give the true statement with respect to the original false one. (a) (4%) [Operating-System Operations] Modern operating systems are interrupt driven . If there are no processes to execute, no I/O devices to service, and no users to whom to respond, an operating system will sit quietly, waiting for something to happen. (b) (4%) [Computer-System Architecture] There are two types of multiple-processor systems: asymmetric multiprocessing (ASMP) and symmetric multiprocessing (SMP). ASMP means that all processors are peers; no master-slave relationship exists between processors. In SMP, a master processor controls the system; the other processors ei- ther look to the master for instruction or have predefined tasks.
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2 (c) (4%) [System Structures] The view of operating system seen by most users is defined by the application and system programs, rather than by the actual system calls. System programs in operating system’s kernel provide a convenient environment for program development and exe- cution. They can be divided into several categories: file management, status information, file modification, programming-language support, program loading and execution, and communications. (d) (4%) [System Structures] The virtual machine itself can execute in only user mode. We have a virtual user mode and a virtual kernel mode, both of which run in a physical user mode. Those actions that
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