delta/cpython-git.git/Lib/weakref.py, branch master

bpo-44962: Fix a race in WeakKeyDict, WeakValueDict and WeakSet when two threads attempt to commit the last pending removal (GH-27921)

2021-08-28T17:07:37+00:00

Fixes:
Traceback (most recent call last):
  File "/home/graingert/projects/asyncio-demo/demo.py", line 36, in 
    sys.exit(main())
  File "/home/graingert/projects/asyncio-demo/demo.py", line 30, in main
    test_all_tasks_threading()
  File "/home/graingert/projects/asyncio-demo/demo.py", line 24, in test_all_tasks_threading
    results.append(f.result())
  File "/usr/lib/python3.10/concurrent/futures/_base.py", line 438, in result
    return self.__get_result()
  File "/usr/lib/python3.10/concurrent/futures/_base.py", line 390, in __get_result
    raise self._exception
  File "/usr/lib/python3.10/concurrent/futures/thread.py", line 52, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/lib/python3.10/asyncio/runners.py", line 47, in run
    _cancel_all_tasks(loop)
  File "/usr/lib/python3.10/asyncio/runners.py", line 56, in _cancel_all_tasks
    to_cancel = tasks.all_tasks(loop)
  File "/usr/lib/python3.10/asyncio/tasks.py", line 53, in all_tasks
    tasks = list(_all_tasks)
  File "/usr/lib/python3.10/_weakrefset.py", line 60, in __iter__
    with _IterationGuard(self):
  File "/usr/lib/python3.10/_weakrefset.py", line 33, in __exit__
    w._commit_removals()
  File "/usr/lib/python3.10/_weakrefset.py", line 57, in _commit_removals
    discard(l.pop())
IndexError: pop from empty list

Also fixes:
Exception ignored in: weakref callback .remove at 0x00007fe82245d2e0>
Traceback (most recent call last):
  File "/usr/lib/pypy3/lib-python/3/weakref.py", line 390, in remove
    del self.data[k]
KeyError: 
Exception ignored in: weakref callback .remove at 0x00007fe82245d2e0>
Traceback (most recent call last):
  File "/usr/lib/pypy3/lib-python/3/weakref.py", line 390, in remove
    del self.data[k]
KeyError: 
Exception ignored in: weakref callback .remove at 0x00007fe82245d2e0>
Traceback (most recent call last):
  File "/usr/lib/pypy3/lib-python/3/weakref.py", line 390, in remove
    del self.data[k]
KeyError: 

See: https://github.com/agronholm/anyio/issues/362#issuecomment-904424310
See also: https://bugs.python.org/issue29519

Co-authored-by: Łukasz Langa

Update URLs in comments and metadata to use HTTPS (GH-27458)

2021-07-30T13:54:46+00:00

bpo-36144: Add union operators to WeakValueDictionary584 (#19127)

2020-03-25T01:51:29+00:00

bpo-36144: Add union operators to WeakKeyDictionary (#19106)

2020-03-23T20:49:46+00:00

bpo-38761: Register WeakSet as a MutableSet (GH-17104)

2019-11-11T04:12:04+00:00

bpo-38006: Avoid closure in weakref.WeakValueDictionary (GH-15641)

2019-09-09T14:55:58+00:00

weakref.WeakValueDictionary defines a local remove() function used as
callback for weak references. This function was created with a
closure.  Modify the implementation to avoid the closure.

bpo-37685: Fixed eq, lt etc implementations in some classes. (GH-14952)

2019-08-08T05:42:54+00:00

They now return NotImplemented for unsupported type of the other operand.

[3.9] bpo-37116: Use PEP 570 syntax for positional-only parameters. (GH-12620)

2019-06-05T15:22:31+00:00

Turn deprecation warnings added in 3.8 into TypeError.

bpo-37116: Use PEP 570 syntax for positional-only parameters. (GH-13700)

2019-06-01T08:00:15+00:00

bpo-36542: Allow to overwrite the signature for Python functions. (GH-12705)

2019-05-06T19:40:27+00:00