Add some comments

Author: taras

uvloop/sslproto.pxd

@@ -58,8 +58,13 @@ cdef class SSLProtocol:
         object _incoming_write
         object _outgoing
         object _outgoing_read
+
+        # Buffer for the underlying UVStream buffered reads
         bytearray _plain_read_buffer
+        # Buffer for SSLObject.read calls
+        # Only allocated when user pass non-buffered Protocol instance
         bytearray _ssl_read_buffer
+        # Cached long object for SSLObject.read calls
         object _ssl_read_max_size_obj
 
         SSLProtocolState _state

uvloop/sslproto.pyx

@@ -348,6 +348,12 @@ cdef class SSLProtocol:
                 self._loop.call_soon(self._app_protocol.connection_lost, exc)
         self._set_state(UNWRAPPED)
         self._transport = None
+
+        # Decrease ref counters to user instances to avoid cyclic references
+        # between user protocol, SSLProtocol and SSLTransport.
+        # This helps to deallocate useless objects asap.
+        # If not done then some tests like test_create_connection_memory_leak
+        # will fail.
         self._app_transport = None
         self._app_protocol = None
         self._app_protocol_get_buffer = None