[libvirt] [PATCH v2 3/4] Add a mutex to serialize updates to firewall

[Eric Blake]

On 01/27/2014 10:18 AM, Daniel P. Berrange wrote:
> The nwfilter conf update mutex previously serialized
> updates to the internal data structures for firewall
> rules, and updates to the firewall itself. Since the
> former is going to be turned into a read/write lock
> instead of a mutex, a new lock is required to serialize
> access to the firewall itself.
> 
> With this new lock, the lock ordering rules will be
> for virNWFilter{Define,Undefine}
> 
>       1. nwfilter driver lock
>       2. nwfilter update lock
>       3. virt driver lock
>       4. domain object lock
>       5. gentech driver lock
> 
> and VM start
> 
>       1. nwfilter update lock
>       2. virt driver lock
>       3. domain object lock
>       4. gentech driver lock
> 
> Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
> ---

Is it worth adding a file describing the lock rules?  Comparable to
qemu/THREADS.txt?

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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