Amaury Forgeot d'Arc <[email protected]> added the comment:
I was about to say "yes, listiter.__next__ is atomic" (it should, really), but
that's not true (Hint: there is a Py_DECREF in the code...).
The script below crashes with:
Fatal Python error: Objects/listobject.c:2774 object at 0x7f66b7a6c600 has
negative ref count -1
Attached patch fixes it.
import threading
class C:
def __del__(self):
print("DEL")
ITER = iter([C() for x in range(100)])
def f():
for obj in ITER:
pass
for x in range(10):
t = threading.Thread(target=f)
t.start()
----------
keywords: +patch
Added file: http://bugs.python.org/file26358/listiter_next_atomic.patch
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<http://bugs.python.org/issue15320>
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