asyncio: sync with Tulip

* Tulip issue 184: FlowControlMixin constructor now get the event loop if the
  loop parameter is not set. Add unit tests to ensure that constructor of
  StreamReader and StreamReaderProtocol classes get the event loop.
* Remove outdated TODO/XXX

1 files changed, 1 insertions, 4 deletions

diff --git a/Lib/asyncio/unix_events.py b/Lib/asyncio/unix_events.py
index 91e43cfc97..1a4d418369 100644
--- a/Lib/asyncio/unix_events.py
+++ b/Lib/asyncio/unix_events.py
@@ -496,9 +496,6 @@ class _UnixWritePipeTransport(transports._FlowControlMixin,
     def can_write_eof(self):
         return True
 
-    # TODO: Make the relationships between write_eof(), close(),
-    # abort(), _fatal_error() and _close() more straightforward.
-
     def write_eof(self):
         if self._closing:
             return
@@ -897,7 +894,7 @@ class FastChildWatcher(BaseChildWatcher):
 
 
 class _UnixDefaultEventLoopPolicy(events.BaseDefaultEventLoopPolicy):
-    """XXX"""
+    """UNIX event loop policy with a watcher for child processes."""
     _loop_factory = _UnixSelectorEventLoop
 
     def __init__(self):