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Galvin Edition 9 Exercise 13 Question 16 (Page No. 620)
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UNIX coordinates the activities of the kernel I/O components by
manipulating shared in-kernel data structures, whereas Windows
uses object-oriented message passing between kernel I/O components.
Discuss three pros and three cons of each approach
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Galvin Edition 9 Exercise 13 Question 15 (Page No. 620)
Some DMA controllers support direct virtual memory access, where the targets of I/O operations are specified as virtual addresses and a translation from virtual to physical address is performed during the DMA. How does this design complicate the design of the DMA controller? What are the advantages of providing such functionality?
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Galvin Edition 9 Exercise 13 Question 14 (Page No. 620)
Typically, at the completion of a device I/O, a single interrupt is raised and appropriately handled by the host processor. In certain settings, however, the code that is to be executed at the completion of the I/O can be broken ... to be executed at a later time. What is the purpose of using this strategy in the design of interrupt handlers?
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Galvin Edition 9 Exercise 13 Question 15 (Page No. 620)
Describe three circumstances under which blocking I/O should be used. Describe three circumstances under which nonblocking I/O should be used. Why not just implement nonblocking I/O and have processes busy-wait until their devices are ready?
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Galvin Edition 9 Exercise 13 Question 18 (Page No. 620)
Write (in pseudocode) an implementation of virtual clocks, including the queueing and management of timer requests for the kernel and applications. Assume that the hardware provides three timer channels.
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