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gh-131586: Avoid refcount contention in some "special" calls (#131588)

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In the free threaded build, the `_PyObject_LookupSpecial()` call can lead to
reference count contention on the returned function object becuase it
doesn't use stackrefs. Refactor some of the callers to use
`_PyObject_MaybeCallSpecialNoArgs`, which uses stackrefs internally.

This fixes the scaling bottleneck in the "lookup_special" microbenchmark
in `ftscalingbench.py`. However, the are still some uses of
`_PyObject_LookupSpecial()` that need to be addressed in future PRs.
This commit is contained in:
Sam Gross 2025-03-26 14:38:47 -04:00 • committed by GitHub
parent 3d4ac1a2c2
commit 67fbfb42bd
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16 changed files with 450 additions and 374 deletions
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3
Lib/test/test_math.py
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@ -573,6 +573,8 @@ def testFloor(self):
#self.assertEqual(math.ceil(NINF), NINF)
#self.assertTrue(math.isnan(math.floor(NAN)))
class TestFloorIsNone(float):
__floor__ = None
class TestFloor:
def __floor__(self):
return 42
@ -588,6 +590,7 @@ class TestBadFloor:
self.assertEqual(math.floor(FloatLike(41.9)), 41)
self.assertRaises(TypeError, math.floor, TestNoFloor())
self.assertRaises(ValueError, math.floor, TestBadFloor())
self.assertRaises(TypeError, math.floor, TestFloorIsNone(3.5))
t = TestNoFloor()
t.__floor__ = lambda *args: args