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Merged revisions 83918 via svnmerge from

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  r83918 | antoine.pitrou | 2010-08-10 00:38:19 +0200 (mar., 10 août 2010) | 5 lines

  Issue #3757: thread-local objects now support cyclic garbage collection.
  Thread-local objects involved in reference cycles will be deallocated
  timely by the cyclic GC, even if the underlying thread is still running.
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This commit is contained in:
Antoine Pitrou 2010-08-09 22:41:38 +00:00
parent 7a956cc74e
commit 87d5260362
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
@ -116,6 +116,20 @@ 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