Workers are switched on round-robin basis, eliminates data transfer
overhead, as backing store is implicitly shared.

Threading model for TCP needs to be altered to prevent memory errors.

Fixed sm_create_socket() for TCP.

Refactored UDP handler and created stub TCP handler.

Removed 3rd parameter of zdb_insert_name() - not used.
Removed all usage of dns-simple from zone parser.

Last usage of dns-simple remains in cuckoo-test (TODO: remove).

ns_create_response() divided into ns_create_empty_response()
  (empty response may be used as an error response) and
  ns_fill_response().
Added another sample zone as ldns had problems parsing the bogus25
  zone.

Now properly deleting the structures when adding fails.
Changed return value of zdb_insert_name() when the zone was not
  found (from 1 to -2).

Added function zp_parse_zonefile_bind().
Changed the sample file to provide owner name for the SOA as
  no origin is given.

Each zone now holds a linked list of all its nodes while these
  are at the same time in the main zone data structure.
  => added pointer to the zone apex to zdb_zone
  => added function zdb_add_zone() to add a zone in ldns_zone
     format to the database.
Note: zdb_insert() does nothing with the given node, so it should
      be used only with nodes already in the list.
TODO: Some way to add a new node to the zone should be provided.

Added owner name and pointers to next and previous item in list
  to the zone node structure + added function zn_owner() for
  getting the node's owner.

Changed API of zone-data-structure: zds_insert() now has only 2
  arguments - the owner is in the node.

Added function for checking skip list emptiness.
Checking ldns_status returned from ldns_pkt2wire() in
  ns_answer_request().
Casting buffers to unsigned char * in call to ns_answer_request().

Changed nameserver's API - function ns_answer_request() to conform
  the ldns type usage.

Zone data structure module now uses ldns structures in the API.
Zone database module now uses ldns structures in the API and
  implementation.
Zone parser and name server modules' iplementation slightly
  modified to be able to call zds and zdb functions.
Minor fixes in dns-simple.

Currently only a function for matching labels in two domain names
  is implemented. May need some revision and testing!

Some other functions had to be modified in order to be able to
  compile the program. However, it is not debugged, and currently
  does not work.

Functions for merging values and printing items removed from the
  skip list structure. Now passed only to appropriate functions.
Bugfix in skip_remove() - was not testing the node pointer for
  NULL.

Added functions
  skip_delete_node for properly deleting skip_node
  skip_destroy_list for properly destroying whole skip list
  skip_print_list for printing the skip list.

Changed return values of function skip_insert().
Renamed skip_delete() to skip_remove() and changed return value
  to int (successful / not found)
Bugfix in skip_remove().

Added test of skip list.

Added 'key' parameter to skip_make_node function.
Added checks for successful allocation.
Added comments to all functions and structures.

Skip list downloaded from
http://en.literateprograms.org/Skip_list_(C)?oldid=12811
and modified to better suit our needs.
Not tested nor compiled yet.

Added sample zone for later testing.

Replacing
  int count = rand() % 10;
with
  int count = rand() % 10 + 1;
seems to do the trick, but really do not know why.

The da_resize() function sometimes crashes on either invalid
  pointer or double free error. TODO: FIX!

ck_rehash() is not part of the API if CT_TEST_REHASH is not
  defined

Fixed stash usage in ck_rehash() and ck_insert_item():
  - cannot copy the pointer because the array may be reallocated
  - TODO: maybe use also rcu_dereference().
Changed way of working with dynamic array:
  - function da_reserve() only makes sure there is enough place in
    the array; added function da_occupy() to really increment the
    item count
  - fixed ck functions to use the array properly.
Bugfix in ck_rehash():
  - was not resizing the stash properly.
Bugfixes in ck_dump_table():
  - wrong accessing of items
Bugfix in da_resize():
  - was not copying the array contents!

RCU test threads must register to RCU.
ck_remove_item() also deletes the value of the item.

Implemented first test of the RCU mechanism - deleting item from
  table while holding a reference to it in another thread.
Bugfix in ck_remove_item() - was dereferencing NULL pointer.