[CSE]  Advanced Operating Systems 
  COMP9242 2002/S2  		UNSW
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Obtain Thread IDs: id_nearest System Call

  • Returns the ID of the thread which would really receive a message sent to a specified destination thread.
  • Also returns a type field, indicating the direction of the IPC with respect to the clan boundary.

  • If destination is:
    inside own clan:
    returns destination thread ID, type = same;
    outside own clan:
    returns own chief's ID, type = outer;
    in subclan of own clan:
    returns ID of chief (within own clan) of subclan, type = inner;
    nil:
    returns own thread ID.


Gernot Heiser 2002-08-07