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Reader-writer lock for multiprocessor systems

  • US 6,823,511 B1
  • Filed: 01/10/2000
  • Issued: 11/23/2004
  • Est. Priority Date: 01/10/2000
  • Status: Expired due to Fees
First Claim
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1. A reader-writer lock for a multiprocessor system comprising:

  • a first counter shared by a first group of two or more processors, the counter adapted to indicate whether a process running on a processor in the first processor group has read-acquired the lock;

    a first flag associated with the first counter, the flag adapted to indicate whether a process running on a processor in the multiprocessor system has write-acquired the lock;

    a second counter shared by a second group of one or more processors, the second counter adapted to indicate whether a process running on a processor in the second processor group has read-acquired the lock; and

    a second flag associated with the second counter, the second flag adapted to indicate whether a process running on a processor in the multiprocessor system has write-acquired the lock.

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