[ovs-dev] Use next_cfg/cur_cfg in the presence of more than one client

Ben Pfaff blp at nicira.com
Fri Aug 28 15:41:57 UTC 2015

On Fri, Aug 28, 2015 at 08:33:23AM -0700, Ashwin Paranjpe wrote:
>  I have a few questions about the following commit:
> http://git.openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=commit;h=b54e22e91eee43eb04ad53e2fa919be44f34e731
> - What would happen if there are two clients and both of them increment the
> next_cfg to the same value?
> I'd imagine the operation won’t be atomic, so this would be possible. One
> of the clients would incorrectly conclude that vswitchd has applied its
> configuration changes; Is my understanding correct?
> - Is there any way we can guarantee correctness in the presence of more
> than 1 client?

The increment is atomic.

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