python · aeros · Nov 25, 2020 · Nov 24, 2020 · Nov 24, 2020 · Nov 25, 2020
diff --git a/Lib/asyncio/locks.py b/Lib/asyncio/locks.py
@@ -8,6 +8,18 @@
 from . import mixins
 
 
+# Used as a sentinel for loop parameter
+_marker = object()
+
+
+def _verify_no_loop(obj, loop):
+    if loop is not _marker:
+        raise TypeError(
+            f'As of 3.10, the *loop* parameter was removed from '
+            f'{type(obj).__name__}() since it is no longer necessary'
+        )
+
+
 class _ContextManagerMixin:
     async def __aenter__(self):
         await self.acquire()
@@ -19,7 +31,7 @@ async def __aexit__(self, exc_type, exc, tb):
         self.release()
 
 
-class Lock(_ContextManagerMixin, mixins._LoopBoundedMixin):
+class Lock(_ContextManagerMixin, mixins._LoopBoundMixin):
     """Primitive lock objects.
 
     A primitive lock is a synchronization primitive that is not owned
@@ -73,7 +85,8 @@ class Lock(_ContextManagerMixin, mixins._LoopBoundedMixin):
 
     """
 
-    def __init__(self):
+    def __init__(self, *, loop=_marker):
+        _verify_no_loop(self, loop)
         self._waiters = None
         self._locked = False
 
@@ -153,7 +166,7 @@ def _wake_up_first(self):
             fut.set_result(True)
 
 
-class Event(mixins._LoopBoundedMixin):
+class Event(mixins._LoopBoundMixin):
     """Asynchronous equivalent to threading.Event.
 
     Class implementing event objects. An event manages a flag that can be set
@@ -162,7 +175,8 @@ class Event(mixins._LoopBoundedMixin):
     false.
     """
 
-    def __init__(self):
+    def __init__(self, loop=_marker):
+        _verify_no_loop(self, loop)
         self._waiters = collections.deque()
         self._value = False
 
@@ -214,7 +228,7 @@ async def wait(self):
             self._waiters.remove(fut)
 
 
-class Condition(_ContextManagerMixin, mixins._LoopBoundedMixin):
+class Condition(_ContextManagerMixin, mixins._LoopBoundMixin):
     """Asynchronous equivalent to threading.Condition.
 
     This class implements condition variable objects. A condition variable
@@ -224,7 +238,8 @@ class Condition(_ContextManagerMixin, mixins._LoopBoundedMixin):
     A new Lock object is created and used as the underlying lock.
     """
 
-    def __init__(self, lock=None):
+    def __init__(self, lock=None, *, loop=_marker):
+        _verify_no_loop(self, loop)
         if lock is None:
             lock = Lock()
         elif lock._loop is not self._get_loop():
@@ -328,7 +343,7 @@ def notify_all(self):
         self.notify(len(self._waiters))
 
 
-class Semaphore(_ContextManagerMixin, mixins._LoopBoundedMixin):
+class Semaphore(_ContextManagerMixin, mixins._LoopBoundMixin):
     """A Semaphore implementation.
 
     A semaphore manages an internal counter which is decremented by each
@@ -343,7 +358,8 @@ class Semaphore(_ContextManagerMixin, mixins._LoopBoundedMixin):
     ValueError is raised.
     """
 
-    def __init__(self, value=1):
+    def __init__(self, value=1, *, loop=_marker):
+        _verify_no_loop(self, loop)
         if value < 0:
             raise ValueError("Semaphore initial value must be >= 0")
         self._value = value
@@ -406,7 +422,8 @@ class BoundedSemaphore(Semaphore):
     above the initial value.
     """
 
-    def __init__(self, value=1):
+    def __init__(self, value=1, *, loop=_marker):
+        _verify_no_loop(self, loop)
         self._bound_value = value
         super().__init__(value)
 

diff --git a/Lib/asyncio/mixins.py b/Lib/asyncio/mixins.py
@@ -6,7 +6,7 @@
 _global_lock = threading.Lock()
 
 
-class _LoopBoundedMixin:
+class _LoopBoundMixin:
     _loop = None
 
     def _get_loop(self):
@@ -17,5 +17,5 @@ def _get_loop(self):
                 if self._loop is None:
                     self._loop = loop
         if loop is not self._loop:
-            raise RuntimeError(f'{type(self).__name__} have already bounded to another loop')
+            raise RuntimeError(f'{self!r} is bound to a different event loop')
         return loop
diff --git a/Lib/asyncio/queues.py b/Lib/asyncio/queues.py
@@ -17,7 +17,7 @@ class QueueFull(Exception):
     pass
 
 
-class Queue(mixins._LoopBoundedMixin):
+class Queue(mixins._LoopBoundMixin):
     """A queue, useful for coordinating producer and consumer coroutines.
 
     If maxsize is less than or equal to zero, the queue size is infinite. If it

diff --git a/Lib/test/test_asyncio/test_locks.py b/Lib/test/test_asyncio/test_locks.py
@@ -51,6 +51,23 @@ def acquire_lock():
 
         self.assertFalse(lock.locked())
 
+    def test_lock_doesnt_accept_loop_parameter(self):
+        primitives_cls = [
+            asyncio.Lock,
+            asyncio.Condition,
+            asyncio.Event,
+            asyncio.Semaphore,
+            asyncio.BoundedSemaphore,
+        ]
+
+        for cls in primitives_cls:
+            with self.assertRaisesRegex(
+                TypeError,
+                rf'As of 3.10, the \*loop\* parameter was removed from '
+                rf'{cls.__name__}\(\) since it is no longer necessary'
+            ):
+                cls(loop=self.loop)
+
     def test_lock_by_with_statement(self):
         loop = asyncio.new_event_loop()  # don't use TestLoop quirks
         self.set_event_loop(loop)

diff --git a/Lib/test/test_asyncio/utils.py b/Lib/test/test_asyncio/utils.py
@@ -541,31 +541,10 @@ def new_test_loop(self, gen=None):
         self.set_event_loop(loop)
         return loop
 
-    def unpatch_get_running_loop(self):
-        events._get_running_loop = self._get_running_loop
-
     def setUp(self):
-        self._get_running_loop = events._get_running_loop
-
-        def _get_running_loop():
-            frame = sys._getframe(1)
-
-            if frame.f_globals['__name__'] == 'asyncio.mixins':
-                # When we called from LoopBoundedMixin we should
-                # fallback to default implementation of get_running_loop
-                try:
-                    return events.get_running_loop()
-                except RuntimeError:
-                    return None
-
-            return None
-
-        events._get_running_loop = _get_running_loop
         self._thread_cleanup = threading_helper.threading_setup()
 
     def tearDown(self):
-        self.unpatch_get_running_loop()
-
         events.set_event_loop(None)
 
         # Detect CPython bug #23353: ensure that yield/yield-from is not used