diff options
| -rw-r--r-- | Lib/_threading_local.py | 8 | ||||
| -rw-r--r-- | Lib/threading.py | 4 | ||||
| -rw-r--r-- | Misc/NEWS | 3 |
3 files changed, 12 insertions, 3 deletions
diff --git a/Lib/_threading_local.py b/Lib/_threading_local.py index 4eda630..243d84e 100644 --- a/Lib/_threading_local.py +++ b/Lib/_threading_local.py @@ -218,10 +218,12 @@ class local(_localbase): key = object.__getattribute__(self, '_local__key') try: - threads = list(threading.enumerate()) + # We use the non-locking API since we might already hold the lock + # (__del__ can be called at any point by the cyclic GC). + threads = threading._enumerate() except: - # If enumerate fails, as it seems to do during - # shutdown, we'll skip cleanup under the assumption + # If enumerating the current threads fails, as it seems to do + # during shutdown, we'll skip cleanup under the assumption # that there is nothing to clean up. return diff --git a/Lib/threading.py b/Lib/threading.py index 1182f19..18c28b7 100644 --- a/Lib/threading.py +++ b/Lib/threading.py @@ -815,6 +815,10 @@ def activeCount(): active_count = activeCount +def _enumerate(): + # Same as enumerate(), but without the lock. Internal use only. + return _active.values() + _limbo.values() + def enumerate(): _active_limbo_lock.acquire() active = _active.values() + _limbo.values() @@ -24,6 +24,9 @@ Core and Builtins Library ------- +- Issue #7264: Fix a possible deadlock when deallocating thread-local objects + which are part of a reference cycle. + - Issue #7249: Methods of io.BytesIO now allow `long` as well as `int` arguments. |