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                        connections to be shared. [RT #37039]

3535.	[func]		Add support for setting Differentiated Services Code
			Point (DSCP) values in named.  Most configuration
			options which take a "port" option (e.g.,
			listen-on, forwarders, also-notify, masters,
			notify-source, etc) can now also take a "dscp"
			option specifying a code point for use with
			outgoing traffic, if supported by the underlying
			OS. [RT #27596]

Added API to create a set of UDP dispatches which can be shared
round-robin style when making upstream queries for authoritative
data; this should reduce lock contention in the query source
dispatch.

			worker threads to process incoming UDP packets.
			This can significantly increase query throughput
			on some systems.  [RT #22992]

			I/O events and query RTT histograms.  [RT #18802]

			forgery resilience. [RT #17949, #18098]

                        [RT #17590]

                        [RT # 16915]

                        made over. See use-queryport-pool, queryport-pool-ports
                        and queryport-pool-updateinterval.  [RT #16415]

                        [RT #11398]

                        dns_portlist_create(), dns_portlist_add(),
                        dns_portlist_remove(), dns_portlist_match(),
                        dns_portlist_attach() and dns_portlist_detach().

1441.   [func]          It is now possible to tell dig to bind to a specific
                        source port.

1440.   [func]          It is now possible to tell named to avoid using
                        certian source ports (avoid-v4-udp-ports,
                        avoid-v6-udp-ports).
developer: marka
reviewer: explorer

the same port for listening and querying, and changing listening addresses
several times. [RT# 3509]

additionally,
  + limited the canceled socket tasks in dispatch.c
  + made dns_dispatch_changeattributes() care about the NOLISTEN mask
  + described side effects of dns_dispatch_changeattributes() in its
    description comment

requirement that it is only called from the task where the
response entry being removed delivers its events (Michael
agrees that this is indeed a requirement)

dispatcher copy the event instead of reusing the original one.

When a socket is shared by clients and query-source, the client hands off
responses to the dispatcher.

own CVS tree will help minimize CVS conflicts.  Maybe not.
Blame Graff for getting me to trim all trailing whitespace.

DNS_DISPATCHATTR_UDP, and document that requirement as well as the
existing requirement for needing DNS_DISPATCHATTR_TCP.

No need to pull up.