Anthony Liguori wrote:
The wait command will pause the monitor the command was issued in until a new event becomes available. Events are queued if there isn't a waiter present. The wait command completes after a single event is available.
How do you stop a wait if there are no pending events?
Today, we queue events indefinitely but in the future, I suspect we'll drop events that are older than a certain amount of time to avoid infinitely allocating memory for long running VMs.
This queueing plug the race where an event happens immediately after a wait completes. But it could be avoided completely by having asynchronous notifications on a single monitor.
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