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Wakeup worker per eventfd

Closed Wakeup worker per eventfd
aj46ezos/emper:wakeup_worker_per_eventfd into master
Closed Florian Fischer requested to merge aj46ezos/emper:wakeup_worker_per_eventfd into master
  1. Feb 19, 2021
    • Florian Fischer's avatar
      [Runtime] use a eventfd to suspend/wakeup workes · dae18a8e
      Florian Fischer authored 
      I could not figure out a non-CAS algorithm for WorkerWakeupStrategy::one
therefore we use a CAS loop and have to see how expensive it is.

Using a eventfd has the advantage that we can't loose wakeups.
If a worker registers it self sleeping by incrementing sleepingWorkers
and another calls write before the first calls read the first will
not block at all.
      dae18a8e