tests: posix: eventfd: test read and poll after multiple writes

When there were multiple writes to eventfd, then poll() + read() should
start behaving as just initialized. Test that by verifying poll() will
timeout first and later be notified properly when eventfd is written
once again from the other thread.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
1 file changed