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gh-111926: Make weakrefs thread-safe in free-threaded builds (#117168)

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Most mutable data is protected by a striped lock that is keyed on the
referenced object's address. The weakref's hash is protected using the
weakref's per-object lock.
 
Note that this only affects free-threaded builds. Apart from some minor
refactoring, the added code is all either gated by `ifdef`s or is a no-op
(e.g. `Py_BEGIN_CRITICAL_SECTION`).
This commit is contained in:
mpage 2024-04-08 07:58:38 -07:00 • committed by GitHub
parent e16062dd34
commit df73179048
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17 changed files with 490 additions and 326 deletions
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8
Lib/test/test_sys.py
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@ -1708,11 +1708,15 @@ class SizeofTest(unittest.TestCase):
# TODO: add check that forces layout of unicodefields
# weakref
import weakref
check(weakref.ref(int), size('2Pn3P'))
if support.Py_GIL_DISABLED:
expected = size('2Pn4P')
else:
expected = size('2Pn3P')
check(weakref.ref(int), expected)
# weakproxy
# XXX
# weakcallableproxy
check(weakref.proxy(int), size('2Pn3P'))
check(weakref.proxy(int), expected)
def check_slots(self, obj, base, extra):
expected = sys.getsizeof(base) + struct.calcsize(extra)