midterm2_11s - COP 4610 Computer Operating Systems Spring...

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COP 4610 Computer Operating Systems Spring 2011 Name: ______________________________ Midterm 2 Last 5 digits of ZN : Zxxx __ __ __ __ __ This is a CLOSED books/notes test. You are NOT allowed to consult any material you have brought into the classroom. NO exchange of information is allowed among students. Write your name and ZN on each sheet detached. 1. Which of the following components of program state are shared across threads in a multithreaded process? (8 pts.) a) Register values yes / no b) Stack memory yes / no c) Global memory yes / no d) Heap memory yes / no 2. Briefly explain what is busy waiting . What may be an alternative to busy waiting in OS? Explain: (12 pts.) 3. We mentioned in class that disabling interrupts frequently can affect the system’s clock. Explain why it can, and how such effects can be minimized. (12 pts.)
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2 4. Consider the following preemptive priority-scheduling algorithm based on dynamically changing priorities. Larger priority numbers imply higher priority. When a process is
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