85 lines
3.2 KiB
Python
85 lines
3.2 KiB
Python
"""``release_free_memory``: glibc's malloc_trim(0), a no-op elsewhere (#523)."""
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import sys
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import unittest
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import unittest.mock as mock
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from utils import native_memory
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class ReleaseFreeMemoryTests(unittest.TestCase):
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def setUp(self):
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# Each test looks the symbol up again.
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patcher = mock.patch.object(
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native_memory, "_trim", native_memory._NOT_LOOKED_UP
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)
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patcher.start()
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self.addCleanup(patcher.stop)
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@unittest.skipUnless(native_memory._glibc(), "glibc only")
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def test_glibc_trims_once_per_call(self):
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self.assertTrue(native_memory.release_free_memory())
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self.assertTrue(native_memory.release_free_memory())
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def test_other_platforms_do_nothing(self):
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for platform in ("win32", "darwin", "cygwin"):
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with self.subTest(platform), mock.patch.object(sys, "platform", platform):
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native_memory._trim = native_memory._NOT_LOOKED_UP
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with mock.patch.object(native_memory.ctypes, "CDLL") as cdll:
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self.assertFalse(native_memory.release_free_memory())
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cdll.assert_not_called()
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def test_musl_does_nothing(self):
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with (
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mock.patch.object(sys, "platform", "linux"),
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mock.patch.object(
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native_memory.os, "confstr", side_effect=ValueError("unknown name")
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),
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mock.patch.object(native_memory.ctypes, "CDLL") as cdll,
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):
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self.assertFalse(native_memory.release_free_memory())
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cdll.assert_not_called()
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def test_a_missing_symbol_is_false(self):
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library = mock.Mock(spec=[]) # no malloc_trim attribute
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with (
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mock.patch.object(native_memory, "_glibc", return_value=True),
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mock.patch.object(native_memory.ctypes, "CDLL", return_value=library),
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):
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self.assertFalse(native_memory.release_free_memory())
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def test_an_unloadable_libc_is_false(self):
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with (
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mock.patch.object(native_memory, "_glibc", return_value=True),
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mock.patch.object(native_memory.ctypes, "CDLL", side_effect=OSError),
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):
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self.assertFalse(native_memory.release_free_memory())
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def test_a_failing_trim_never_raises(self):
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trim = mock.Mock(side_effect=OSError("boom"))
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library = mock.Mock(malloc_trim=trim)
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with (
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mock.patch.object(native_memory, "_glibc", return_value=True),
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mock.patch.object(native_memory.ctypes, "CDLL", return_value=library),
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):
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self.assertFalse(native_memory.release_free_memory())
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trim.assert_called_once_with(0)
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def test_the_symbol_is_looked_up_once(self):
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trim = mock.Mock(return_value=1)
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library = mock.Mock(malloc_trim=trim)
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with (
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mock.patch.object(native_memory, "_glibc", return_value=True),
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mock.patch.object(
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native_memory.ctypes, "CDLL", return_value=library
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) as cdll,
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):
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self.assertTrue(native_memory.release_free_memory())
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self.assertTrue(native_memory.release_free_memory())
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cdll.assert_called_once_with(None)
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self.assertEqual(trim.call_count, 2)
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if __name__ == "__main__":
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unittest.main()
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