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Rename Future._blocking to _asyncio_future_blocking.

Browse source 
This is now an official "protected" API that can be used to write
classes that are duck-type-compatible with Future without subclassing
it.  (For that purpose I also changed isinstance(result, Future) to
check for this attribute instead.)

Hopefully Amber Brown can use this to make Twisted.Deferred compatible
with asyncio.Future.

Tests and docs are TBD.
This commit is contained in:
Guido van Rossum 2016-09-09 12:54:54 -07:00
parent c1db513e36
commit 1140a03426
2 changed files with 14 additions and 5 deletions
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7
Lib/asyncio/tasks.py
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@ -249,7 +249,8 @@ class Task(futures.Future):
self.set_exception(exc)
raise
else:
if isinstance(result, futures.Future):
blocking = getattr(result, '_asyncio_future_blocking', None)
if blocking is not None:
# Yielded Future must come from Future.__iter__().
if result._loop is not self._loop:
self._loop.call_soon(
@ -257,8 +258,8 @@ class Task(futures.Future):
RuntimeError(
'Task {!r} got Future {!r} attached to a '
'different loop'.format(self, result)))
elif result._blocking:
result._blocking = False
elif blocking:
result._asyncio_future_blocking = False
result.add_done_callback(self._wakeup)
self._fut_waiter = result
if self._must_cancel: