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Module 2: Processes & Scheduling

20257m

Define threads and explain their various states. Compare user-level threads with kernel-level threads.

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Threads & States

Thread = lightweight process, dispatchable unit, shares address space, files of parent.
States: New, Ready, Running, Blocked, Terminated.

ULT vs KLT

  • ULT: managed by user library, many-to-one, fast, kernel unaware, blocking blocks process.
  • KLT: managed by kernel, one-to-one, slower but true parallelism, blocking of one KLT not block process. Hybrid many-to-many combines.

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