Add a test whichs creates 64 threads who all epoll_wait() on the same
eventpoll. The source eventfd is written but never read, therefore all the
threads should always see an EPOLLIN event.
This test fails because of a kernel bug, which will be fixed by a follow-up
commit.
Signed-off-by: Nam Cao <nam...@linutronix.de>
---
.../filesystems/epoll/epoll_wakeup_test.c | 45 +++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c
b/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c
index 65ede506305c..0852c68d0461 100644
--- a/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c
+++ b/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c
@@ -3493,4 +3493,49 @@ TEST(epoll64)
close(ctx.sfd[1]);
}
+static void *epoll65_wait(void *ctx_)
+{
+ struct epoll_mtcontext *ctx = ctx_;
+ struct epoll_event event;
+
+ for (int i = 0; i < 100000; ++i) {
+ if (!epoll_wait(ctx->efd[0], &event, 1, 0))
+ return (void *)ENODATA;
+ }
+
+ return (void *)0;
+}
+
+TEST(epoll65)
+{
+ struct epoll_mtcontext ctx;
+ struct epoll_event event;
+ int64_t dummy_data = 99;
+ pthread_t threads[64];
+ uintptr_t ret;
+ int i, err;
+
+ ctx.efd[0] = epoll_create(1);
+ ASSERT_GE(ctx.efd[0], 0);
+ ctx.efd[1] = eventfd(0, 0);
+ ASSERT_GE(ctx.efd[1], 0);
+
+ event.events = EPOLLIN;
+ err = epoll_ctl(ctx.efd[0], EPOLL_CTL_ADD, ctx.efd[1], &event);
+ ASSERT_EQ(err, 0);
+
+ write(ctx.efd[1], &dummy_data, sizeof(dummy_data));
+
+ for (i = 0; i < ARRAY_SIZE(threads); ++i)
+ ASSERT_EQ(pthread_create(&threads[i], NULL, epoll65_wait,
&ctx), 0);
+
+ for (i = 0; i < ARRAY_SIZE(threads); ++i) {
+ ASSERT_EQ(pthread_join(threads[i], (void **)&ret), 0);
+ ASSERT_EQ(ret, 0);
+ }
+
+ close(ctx.efd[0]);
+ close(ctx.efd[1]);
+}
+
TEST_HARNESS_MAIN
--
2.39.5
