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# Copyright (c) 2023, Oracle and/or its affiliates.
# SPDX-License-Identifier: LGPL-2.1-or-later
from drgn.helpers.linux.wait import waitqueue_active, waitqueue_for_each_task
from tests.linux_kernel import LinuxKernelTestCase, skip_unless_have_test_kmod
@skip_unless_have_test_kmod
class TestWaitqueue(LinuxKernelTestCase):
@classmethod
def setUpClass(cls):
super().setUpClass()
cls.waitq = cls.prog["drgn_test_waitq"].address_of_()
cls.empty_waitq = cls.prog["drgn_test_empty_waitq"].address_of_()
def test_waitqueue_active(self):
self.assertTrue(waitqueue_active(self.waitq))
self.assertFalse(waitqueue_active(self.empty_waitq))
def test_waitqueue_for_each_task(self):
self.assertEqual(list(waitqueue_for_each_task(self.empty_waitq)), [])
self.assertEqual(
list(waitqueue_for_each_task(self.waitq)),
[self.prog["drgn_test_waitq_kthread"]],
)
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