Koofers

Past Exam for CS 571 - Operating Systems at George Mason (GMU)

Exam Information

Material Type:Mid-Term
Professor:Staff
Class:CS 571 - Operating Systems
Subject:Computer Science
University:George Mason University
Term:--
Keywords:
  • Particularly
  • Either...or
  • Provided That
  • Immediately
  • Utilization
  • Explanation
  • Intervention
  • Interesting
  • Interpretation
  • Instruction
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Sample Document Text

CS571 Fall 2003 Midterm Solution Page 1 (1) [3] Released: CPU, Held: memory [and some other resources] 1 1 ?2 points each. Many suggested that ''no resources are released:'' if so, then what's the point in blocking the process [review the reasons for introducing the states 'blocked' and 'blocked and swapped'] (2) [3] Essentially because once the PC is restored the next execution cycle will resume the sus- pended process: this means that the entire context that needs to be restored must have been restored. Also, the very act of doing the restoration will involve executing instruc- tions, hence the use of the PC. 2 points. Many answers only suggested that the PC was needed to point to the next instruction in order for the process to be resumed; this is true, but it doesn't explain why that all impor- tant PC value needs to be the last value restored. Several answers featured imprecise statements about the PC, saying it contains the next instruction: it does not. It contains the address of the n...

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