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Issue #3757: thread-local objects now support cyclic garbage collection.

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Thread-local objects involved in reference cycles will be deallocated
timely by the cyclic GC, even if the underlying thread is still running.
This commit is contained in:
Antoine Pitrou 2010-08-09 22:38:19 +00:00
parent 6e451df800
commit 5af4f4b983
3 changed files with 244 additions and 47 deletions
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18
Lib/test/test_threading_local.py
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@ -38,9 +38,9 @@ class BaseLocalTest:
gc.collect()
self.assertEqual(len(weaklist), n)
# XXX threading.local keeps the local of the last stopped thread alive.
# XXX _threading_local keeps the local of the last stopped thread alive.
deadlist = [weak for weak in weaklist if weak() is None]
self.assertEqual(len(deadlist), n-1)
self.assertIn(len(deadlist), (n-1, n))
# Assignment to the same thread local frees it sometimes (!)
local.someothervar = None
@ -127,6 +127,20 @@ class BaseLocalTest:
class ThreadLocalTest(unittest.TestCase, BaseLocalTest):
_local = _thread._local
# Fails for the pure Python implementation
def test_cycle_collection(self):
class X:
pass
x = X()
x.local = self._local()
x.local.x = x
wr = weakref.ref(x)
del x
gc.collect()
self.assertIs(wr(), None)
class PyThreadingLocalTest(unittest.TestCase, BaseLocalTest):
_local = _threading_local.local