changelog

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+0.4.0
+=====
+- reworked Dogpile's API into a new object called Lock.
+  Lock presents just one set of arguments for locking within
+  one constructor call, and provides the "comprehensive" caching
+  pattern that is what's desired in the vast majority of cases.
+  The Dogpile class is now legacy, and
+  builds its various usage patterns on top of Lock.
+
+- Fixed the dependency on storing "creationtime" locally in memory;
+  this caused dogpile pileups for a missing cache value when used in multiple-process
+  environments.  The new Lock object now checks the value_and_created_fn()
+  an extra time within the "lock acquired" phase so that multiple writers
+  who entered the block don't rely upon a memory-only version of creation
+  time.  #1
+
+- The NameRegistry class is no longer needed for use with Lock,
+  as there is no shared state.   The class is still handy and will
+  hang around, however.
+
 0.3.3
 =====
 - repair setup.py so that tests don't install,