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selftests/eventpoll: Add test for multiple waiters

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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 <namcao@linutronix.de>
Link: https://patch.msgid.link/b11947013563875c046c0b0959c29fd95eeebd34.1780422138.git.namcao@linutronix.de
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Nam Cao 2026-06-02 19:51:45 +02:00 committed by Christian Brauner
parent 70a03a385d
commit 827382c088
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1 changed files with 45 additions and 0 deletions
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45
tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c
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@ -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