[CSE]  Advanced Operating Systems 
  COMP9242 2002/S2  		UNSW
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Next: Manipulate Scheduling Parameters: thread_schedule Up: 01-l4 Previous: Thread Manipulation: lthread_ex_regs System

Release CPU: thread_switch System Call

The calling thread voluntarily releases the CPU.
  • May specify another thread to continue immediately
    (``time slice donation'').
    • Destination thread gets remaining time slice ``for free''.
    • Normal scheduling taken at expiry.

  • May yield CPU by not specifying valid destination thread.
    • Remaining time thread is forfeit.
    • Normal scheduling action taken immediately
      (possibly re-scheduling caller thread).


Gernot Heiser 2002-08-07