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Media player application software specific to presenting audio and video material Control panel system software the control panel makes configuration and management of the system easier, and system administration supports all applications Email client application software specific to the email application 6.5 Why is it that threads are faster to create than processes When the operating system creates a process, it must allocate memory for the process and create a process control block. To create a thread, the operating system need only create a much smaller thread control block. Because threads within a process share memory and other resources (e.g., open files) available to the process, the operating system has much less set-up to do when creating a new thread. 6.6 What advantage do kernel threads provide over user threads Give an example of a user thread package. A major advantage of kernel threads is that when a kernel thread blocks for I/O, other threads continue to execute. This is because a kernel thread is visible to the operating system, and each thread can separately scheduled. User threads, on the other hand, are not visible to the OS. With a user thread package, the process is the only entity of which the operating system is aware. POSIX is a user thread package, although some operating systems (e.g., Solaris) implement the POSIX interface using calls to the kernel threads offered by the operating system. 6.7 When a process is multithreaded, which of these resources are shared among the threads, and which are private to each thread Memory shared between threads Program counter private to each thread Global variables shared among all threads Open files shared among all threads Register contents private to each thread Stack/local/automatic variables private to each thread 6.8 List four events that transfer control to the operating system in privileged mode. I/O interrupt System clock interrupt Process makes a system call (e.g., read, write, file open, etc.) A process page-faults A process causes a memory protection error 6.9 How can a semaphore be used to insure that Process First will complete before Process Second executes The semaphore must be shared between processes First and Second. The semaphore must be set to 0 initially. At the beginning of Second, Second must execute a P() operation (also called test,
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What are the physical addresses corresponding to the following logical addresses Logical address 0 430 2071 4129 5209 4096 4526 6167 5123 memory protection error
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6.14 Why do virtual memory systems include a modified bit in the page table entry If a process has written to a page, it will take more time to reallocate that memory to a new page. If a page has been modified, the system must write the page to disk before the frame of memory can be used for another page mapping. On the other hand, the system does not need to write and
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