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Improve sql semaphore wait logic · Issue #264 · madelson/DistributedLock · GitHub

Improve sql semaphore wait logic #264

Description

New description

It is OK to block on the first ticket since we only block when we determine that nothing is free. However, we need to lengthen the wait a bit.

Old description

currently we do a 32ms wait on the first ticket we try. This is both (sometimes) too short for deadlock detection and also non-optimal because we might end up blocking when another ticket is currently free.

A better approach would be:

  • Wait only the LAST ticket we try instead of the first (@i == @{MaxCountParameter} - 1)
  • Instead of passing bool allowWait, we should pass in string? singleWaitExpression which will be something like expiry is never (inf) ? 250 : min(250, (1/3)(expiry - now))

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