tools/testing/selftests/bpf/prog_tests/timer_lockup.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/timer_lockup.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/prog_tests/timer_lockup.c
Extension
.c
Size
2187 bytes
Lines
102
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (i > 50) {
			WRITE_ONCE(skip, true);
			break;
		}
	}

	return NULL;
}

void test_timer_lockup(void)
{
	int timer1_prog, timer2_prog;
	struct timer_lockup *skel;
	pthread_t thrds[2];
	void *ret;

	if (get_nprocs() < 2) {
		test__skip();
		return;
	}

	skel = timer_lockup__open_and_load();
	if (!skel && errno == EOPNOTSUPP) {
		test__skip();
		return;
	}
	if (!ASSERT_OK_PTR(skel, "timer_lockup__open_and_load"))
		return;

	timer1_prog = bpf_program__fd(skel->progs.timer1_prog);
	timer2_prog = bpf_program__fd(skel->progs.timer2_prog);

	timer1_err = &skel->bss->timer1_err;
	timer2_err = &skel->bss->timer2_err;

	if (!ASSERT_OK(pthread_create(&thrds[0], NULL, timer_lockup_thread,
				      &timer1_prog),
		       "pthread_create thread1"))
		goto out;
	if (!ASSERT_OK(pthread_create(&thrds[1], NULL, timer_lockup_thread,
				      &timer2_prog),
		       "pthread_create thread2")) {
		pthread_exit(&thrds[0]);
		goto out;
	}

	pthread_join(thrds[1], &ret);
	pthread_join(thrds[0], &ret);

	if (skip) {
		test__skip();
		goto out;
	}

	if (*timer1_err != -EDEADLK && *timer1_err != 0)
		ASSERT_FAIL("timer1_err bad value");
	if (*timer2_err != -EDEADLK && *timer2_err != 0)
		ASSERT_FAIL("timer2_err bad value");
out:
	timer_lockup__destroy(skel);
	return;
}

Annotation

Implementation Notes