testEpollWaitTimeoutAccuracy() — netty Function Reference

Source Code

transport-native-epoll/src/test/java/io/netty/channel/epoll/EpollTest.java lines 37–58

    @Test
    @Timeout(value = 5000, unit = TimeUnit.MILLISECONDS)
    public void testEpollWaitTimeoutAccuracy() throws Exception {
        final int timeoutMs = 200;
        final FileDescriptor epoll = Native.newEpollCreate();
        final EpollEventArray eventArray = new EpollEventArray(8);
        try {
            long startNs = System.nanoTime();
            // No fds registered, so this will just wait for the timeout.
            int ready = Native.epollWait(epoll, eventArray, timeoutMs);
            long elapsedMs = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startNs);

            assertEquals(0, ready);
            // Should have waited at least close to the timeout
            assertThat(elapsedMs).isGreaterThanOrEqualTo(timeoutMs - 20);
            // Should not have waited vastly longer than the timeout
            assertThat(elapsedMs).isLessThan(timeoutMs + 200);
        } finally {
            eventArray.free();
            epoll.close();
        }
    }