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Subject[PATCH 1/2] kselftest: introduce new epoll test case
Date
This incorporates the testcase originally reported in:

https://bugzilla.kernel.org/show_bug.cgi?id=208943

Which ensures an event is reported to all threads blocked on the
same epoll descriptor, otherwise only a single thread will receive
the wakeup once the event become ready.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
---
.../filesystems/epoll/epoll_wakeup_test.c | 44 +++++++++++++++++++
1 file changed, 44 insertions(+)

diff --git a/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c b/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c
index ad7fabd575f9..65ede506305c 100644
--- a/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c
+++ b/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c
@@ -3449,4 +3449,48 @@ TEST(epoll63)
close(sfd[1]);
}

+/*
+ * t0 t1
+ * (ew) \ / (ew)
+ * e0
+ * | (lt)
+ * s0
+ */
+TEST(epoll64)
+{
+ pthread_t waiter[2];
+ struct epoll_event e;
+ struct epoll_mtcontext ctx = { 0 };
+
+ signal(SIGUSR1, signal_handler);
+
+ ASSERT_EQ(socketpair(AF_UNIX, SOCK_STREAM, 0, ctx.sfd), 0);
+
+ ctx.efd[0] = epoll_create(1);
+ ASSERT_GE(ctx.efd[0], 0);
+
+ e.events = EPOLLIN;
+ ASSERT_EQ(epoll_ctl(ctx.efd[0], EPOLL_CTL_ADD, ctx.sfd[0], &e), 0);
+
+ /*
+ * main will act as the emitter once both waiter threads are
+ * blocked and expects to both be awoken upon the ready event.
+ */
+ ctx.main = pthread_self();
+ ASSERT_EQ(pthread_create(&waiter[0], NULL, waiter_entry1a, &ctx), 0);
+ ASSERT_EQ(pthread_create(&waiter[1], NULL, waiter_entry1a, &ctx), 0);
+
+ usleep(100000);
+ ASSERT_EQ(write(ctx.sfd[1], "w", 1), 1);
+
+ ASSERT_EQ(pthread_join(waiter[0], NULL), 0);
+ ASSERT_EQ(pthread_join(waiter[1], NULL), 0);
+
+ EXPECT_EQ(ctx.count, 2);
+
+ close(ctx.efd[0]);
+ close(ctx.sfd[0]);
+ close(ctx.sfd[1]);
+}
+
TEST_HARNESS_MAIN
--
2.26.2
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