Explain advantages and inconveniences of ult, Operating System

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  1. Thread switching doesn't involve the kernel - no mode switching
  2. Scheduling is able to be application specific - choose the best algorithm.
  3. ULTs is able to run on any OS - Only needs a thread library


  1. the majority system calls are blocking and the kernel blocks processes - thus all  threads within the process will be blocked

      2. The kernel be able to only assign processes to processors - Two threads within the same process can't run simultaneously on two processors


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