Rationale: LL is doing all throttling per service (host:port), not per
service hostname. Also, textures and capabilities use the same host: the
sim you are connected to. Splitting the queues up on a per-service basis
will stop the textures from blocking a capability request.
After commit things compile again :).
The HTTP bandwidth throttling is not yet implemented. I'll put a
temporary fix back the next commit that just does it the "old way"...
Renamed PerHostRequestQueue and PerHostRequestQueuePtr to
AIPerHostRequestQueue and AIPerHostRequestQueuePtr respectively and
moved them to global namespace. This in preparation for using them in
the texture fetcher (as function of the hostname of the url that is
contructed there).
The new variable is updated to contain the sum of the size of
PerHostRequestQueue::mQueuedRequests of every PerHostRequestQueue
object, and thus the total number of queued requests for all hosts
together.
Also added PerHostRequestQueue::host_queued_plus_added_size() which
returns the the sum of queued requests plus the requests already added
to the multi handle for this particular hostname.
Adds a std::map for hostname (or urls) --> PerHostRequestQueue
objects. The latter keeps track of the number of added curl easy
requests and decides if a new request should be throttled or
not, as well as provides the queue to queue throttled requests.
At the moment CurlConcurrentConnectionsPerHost is set to 16,
because things really don't work without LL supporting connection
reuse if we limit it to 2. CurlConcurrentConnectionsPerHost is
also set to non-persistent so that we can easily change it in the future
(once we decide on it's final value it can be set to persistent).
