What are latches?

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What are latches?

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Latches are data structures used for protecting memory structures that are needed for a short period of time, e.g., the least recently used (LRU) list. Request for latches are not queued for execution. Following are the two modes of latches:

  • Willing-to-wait mode
  • Immediate mode
If a process requests a latch in the willing-to-wait mode and the latch is not immediately available, then the process waits for the latch. However, if the process requests for a latch in the immediate mode and the latch is not immediately available, then the process continues with its processing.


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