[libvirt] Re: [Qemu-devel] [PATCH 2/6] Introduce monitor 'wait' command (v2)

Avi Kivity avi at redhat.com
Thu Apr 9 11:01:19 UTC 2009

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.

I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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