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OPTIMIZING GRACE PERIOD DETECTION FOR PREEMPTIBLE READ-COPY UPDATE ON UNIPROCESSOR SYSTEMS

  • US 20100023559A1
  • Filed: 07/28/2008
  • Published: 01/28/2010
  • Est. Priority Date: 07/28/2008
  • Status: Active Grant
First Claim
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1. A method for optimizing grace period detection following a data element update operation that affects preemptible data readers, comprising:

  • determining if said data processing system is a uniprocessor system or a multiprocessor system;

    performing grace period detection processing using a first grace period detection technique if said data processing system is a multiprocessor system;

    performing grace period detection processing using a second grace period detection technique if said data processing system is a uniprocessor system; and

    said grace period detection processing according to either technique determining the end of a grace period in which readers that are subject to preemption have passed through a quiescent state and cannot be maintaining references to said pre-update view of said shared data.

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