[libvirt] [PATCH] daemon: Move TLS initialization to virInitialize

[Eric Blake]

On 08/24/2011 08:58 AM, Daniel P. Berrange wrote:
>> Either we need a virDeinitialize which does the virNetTLSDeinit, and
>> libvirtd calls virDeinitialize; or you can just drop all calls to
>> virNetTLSDeinit.
>
> deinitialize is really a waste of time, or even wrong. Some
> other libraries libvirt links to might also use TLS, so we
> can't ever be sure it is safe to deinitialize. Even in the
> daemon i think it is pretty pointless.

If init and deinit are reference counted, then deinit makes sense - 
reduce the reference count when our library is done using it without 
unloading it from any other library, and if our library was the last 
client, then reclaim the resources.  But if this is the case, then the 
client that is using us as a library has to have symmetric access points 
- if virInitialize added a reference count to tls, then virDeinitialize 
needs to reduce it.

But I don't know if tls deinit is reference counted - if it is not 
counted in a thread-safe manner, then I agree that the only safe course 
of action is to never deinit tls.  And even if tls deinit is safe, it is 
a waste of time to deinit in libvirtd, when we know we are about to 
exit(), except in the case where we are trying to silence valgrind.

-- 
Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org