Merge pull request #16 from alexander-gridnev/master

Updated change log for RWLock fix

doc/changelog.rst

@@ -3,6 +3,26 @@ Changelog
 
 .. module:: toro
 
+Changes in Version 1.1
+----------------------
+
+Bug fix in :class:`~toro.RWLock`: when max_readers > 1
+:meth:`~toro.RWLock.release_read` must release one reader
+in case :meth:`~toro.RWLock.acquire_read` was called at least once::
+
+    @gen.coroutine
+    def coro():
+        lock = toro.RWLock(max_readers=10)
+        assert not lock.locked()
+
+        yield lock.acquire_read()
+        lock.release_read()
+
+But, in old version :meth:`~toro.RWLock.release_read` raises RuntimeException
+if a lock in unlocked state, even if :meth:`~toro.RWLock.acquire_read`
+was already called several times.
+
+
 Changes in Version 1.0
 ----------------------