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Issue #15528: Delay importing atexit until weakref.finalize() used.

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This commit is contained in:
Richard Oudkerk 2013-06-08 16:52:29 +01:00
parent 99c5afcb60
commit a81dd65940
1 changed files with 7 additions and 3 deletions
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10
Lib/weakref.py
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@ -23,7 +23,6 @@ from _weakrefset import WeakSet, _IterationGuard
import collections # Import after _weakref to avoid circular import. import collections # Import after _weakref to avoid circular import.
import sys import sys
import itertools import itertools
import atexit
ProxyTypes = (ProxyType, CallableProxyType) ProxyTypes = (ProxyType, CallableProxyType)
@ -464,11 +463,18 @@ class finalize:
_shutdown = False _shutdown = False
_index_iter = itertools.count() _index_iter = itertools.count()
_dirty = False _dirty = False
_registered_with_atexit = False
class _Info: class _Info:
__slots__ = ("weakref", "func", "args", "kwargs", "atexit", "index") __slots__ = ("weakref", "func", "args", "kwargs", "atexit", "index")
def __init__(self, obj, func, *args, **kwargs): def __init__(self, obj, func, *args, **kwargs):
if not self._registered_with_atexit:
# We may register the exit function more than once because
# of a thread race, but that is harmless
import atexit
atexit.register(self._exitfunc)
finalize._registered_with_atexit = True
info = self._Info() info = self._Info()
info.weakref = ref(obj, self) info.weakref = ref(obj, self)
info.func = func info.func = func
@ -569,5 +575,3 @@ class finalize:
finalize._shutdown = True finalize._shutdown = True
if reenable_gc: if reenable_gc:
gc.enable() gc.enable()
atexit.register(finalize._exitfunc)