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The four conditions necessary for deadlock to occur are: mutual exclusion, hold and wait, no preemption, and circular wait. Avoiding deadlocks, or detecting and correcting them, turns out to be costly of performance and difficult to implement in the general case. We discussed various mechanisms for preventing deadlocks, and we discussed the banker s algorithm for deadlock avoidance. Today most general-purpose operating systems employ paged virtual memory. A page is a unit of logical address space, and a frame is a same-size unit of physical memory. By means of a page table data structure, which maps pages to frames, the operating system maps logical addresses to physical addresses. The advantages of virtual memory include a very large logical address space, and a higher degree of multiprogramming. The file system is a very visible feature of any operating system. We discussed various file management systems, including systems based on linked allocation of file blocks and systems based on indexed allocation of file blocks. Newer file systems are incorporating journaling of transactions in order to better insure file system stability.
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REVIEW QUESTIONS 6.1 What is the advantage of managing I/O with interrupts If an active typist is typing 30 words per minute into a word processor, and the computer operates at one million machine instructions per second, how many machine instructions can be executed in the time it takes a character to be typed on the keyboard Explain why a DMA channel would or would not be useful in a computer without an interrupt-based I/O system. What scheduling concept was critical to the development of timesharing computers, and has remained an important part of scheduling for interactive computer systems Categorize the following programs as system software or application software, and explain your categorization: Java Virtual Machine Excel PowerPoint C compiler C library Oracle data-base management system Employee payroll system Web browser Media player Control panel E-mail client
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Why is it that threads are faster to create than processes What advantage do kernel threads provide over user threads Give an example of a user thread package. When a process is multithreaded, which of these resources are shared among the threads, and which are private to each thread Memory Program counter Global variables Open files Register contents Stack/local/automatic variables
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List four events that transfer control to the operating system in privileged mode. How can a semaphore be used to insure that Process First will complete before Process Second executes
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6.10 Describe how transaction logging might apply to a file system, and give an example of a file system that employs transaction logging.
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6.11 If a memory access requires 100 nanoseconds, and the computer uses a page table and virtual memory, how long does it take to read a word of program memory 6.12 If we add a TLB to the computer in the previous question, and 80 percent of the time the page table entry is in the TLB (i.e., the required memory access results in a hit in the TLB 80 percent of the time), on average, how long does it take to read a word of program memory 6.13 A paging system uses pages with 1024 addresses per page. Given the following page table: Page 0 1 2 3 4 Frame 4 10 6 7 5
What are the physical addresses corresponding to the following logical addresses Logical address 0 430 2071 4129 5209 6.14 Why do virtual memory systems include a modified bit in the page table entry 6.15 Why would fixed-length record files be a good choice for storing data from data-base tables 6.16 How would you expect process scheduling policies to be different on batch computing systems and interactive systems 6.17 How would you measure the success of a batch operating system Would you measure the success of an interactive system like Unix or Windows the same way If not, how would you measure the success of an interactive operating system
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