(Merge 3.4) asyncio: sync with Tulip

* _WaitHandleFuture.cancel() now notify IocpProactor through the overlapped
  object that the wait was cancelled.
* Optimize IocpProactor.wait_for_handle() gets the result if the wait is
  signaled immediatly.
* Enhance representation of Future and Future subclasses

  - Add "created at filename:lineno" in the representation
  - Add Future._repr_info() method which can be more easily overriden than
    Future.__repr__(). It should now be more easy to enhance Future
    representation without having to modify each subclass. For example,
    _OverlappedFuture and _WaitHandleFuture get the new "created at" information.
  - Use reprlib to format Future result, and function arguments when formatting a
    callback, to limit the length of the representation.

* Fix repr(_WaitHandleFuture)
* _WaitHandleFuture and _OverlappedFuture: hide frames of internal calls in the
  source traceback.
* Cleanup ProactorIocp._poll(): set the timeout to 0 after the first call to
  GetQueuedCompletionStatus()
* test_locks: close the temporary event loop and check the condition lock
* Remove workaround in test_futures, no more needed

1 files changed, 6 insertions, 0 deletions

diff --git a/Lib/test/test_asyncio/test_tasks.py b/Lib/test/test_asyncio/test_tasks.py
index 7b93a0e..95cba54 100644
--- a/Lib/test/test_asyncio/test_tasks.py
+++ b/Lib/test/test_asyncio/test_tasks.py
@@ -132,6 +132,8 @@ class TaskTests(test_utils.TestCase):
             asyncio.async('ok')
 
     def test_task_repr(self):
+        self.loop.set_debug(False)
+
         @asyncio.coroutine
         def notmuch():
             yield from []
@@ -189,6 +191,8 @@ class TaskTests(test_utils.TestCase):
                          "<Task finished %s result='abc'>" % coro)
 
     def test_task_repr_coro_decorator(self):
+        self.loop.set_debug(False)
+
         @asyncio.coroutine
         def notmuch():
             # notmuch() function doesn't use yield from: it will be wrapped by
@@ -252,6 +256,8 @@ class TaskTests(test_utils.TestCase):
         self.loop.run_until_complete(t)
 
     def test_task_repr_wait_for(self):
+        self.loop.set_debug(False)
+
         @asyncio.coroutine
         def wait_for(fut):
             return (yield from fut)