testEventFDETSemantics() — netty Function Reference

Source Code

transport-native-epoll/src/test/java/io/netty/channel/epoll/EpollEventLoopTest.java lines 100–148

    @Test
    public void testEventFDETSemantics() throws Throwable {
        final FileDescriptor epoll = Native.newEpollCreate();
        final FileDescriptor eventFd = Native.newEventFd();
        final FileDescriptor timerFd = Native.newTimerFd();
        final EpollEventArray array = new EpollEventArray(1024);
        try {
            Native.epollCtlAdd(epoll.intValue(), eventFd.intValue(), Native.EPOLLIN | Native.EPOLLET);
            final AtomicReference<Throwable> causeRef = new AtomicReference<Throwable>();
            final AtomicInteger integer = new AtomicInteger();
            final Thread t = new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        for (int i = 0; i < 2; i++) {
                            int ready = Native.epollWait(epoll, array, timerFd, -1, -1);
                            assertEquals(1, ready);
                            assertEquals(eventFd.intValue(), array.fd(0));
                            integer.incrementAndGet();
                        }
                    } catch (IOException e) {
                        causeRef.set(e);
                    }
                }
            });
            t.start();
            Native.eventFdWrite(eventFd.intValue(), 1);

            // Spin until we was the wakeup.
            while (integer.get() != 1) {
                Thread.sleep(10);
            }
            // Sleep for a short moment to ensure there is not other wakeup.
            Thread.sleep(1000);
            assertEquals(1, integer.get());
            Native.eventFdWrite(eventFd.intValue(), 1);
            t.join();
            Throwable cause = causeRef.get();
            if (cause != null) {
                throw cause;
            }
            assertEquals(2, integer.get());
        } finally {
            array.free();
            epoll.close();
            eventFd.close();
            timerFd.close();
        }
    }