| /* |
| * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* @test |
| * @bug 6405995 |
| * @summary Unit test for selector wakeup and interruption |
| * @library .. |
| */ |
| |
| import java.io.*; |
| import java.net.*; |
| import java.nio.*; |
| import java.nio.channels.*; |
| import java.util.Random; |
| |
| public class Wakeup { |
| |
| static void sleep(int millis) { |
| try { |
| Thread.sleep(millis); |
| } catch (InterruptedException x) { |
| x.printStackTrace(); |
| } |
| } |
| |
| static class Sleeper extends TestThread { |
| volatile boolean started = false; |
| volatile int entries = 0; |
| volatile int wakeups = 0; |
| volatile boolean wantInterrupt = false; |
| volatile boolean gotInterrupt = false; |
| volatile Exception exception = null; |
| volatile boolean closed = false; |
| Object gate = new Object(); |
| |
| Selector sel; |
| |
| Sleeper(Selector sel) { |
| super("Sleeper", System.err); |
| this.sel = sel; |
| } |
| |
| public void go() throws Exception { |
| started = true; |
| for (;;) { |
| synchronized (gate) { } |
| entries++; |
| try { |
| sel.select(); |
| } catch (ClosedSelectorException x) { |
| closed = true; |
| } |
| boolean intr = Thread.currentThread().isInterrupted(); |
| wakeups++; |
| System.err.println("Wakeup " + wakeups |
| + (closed ? " (closed)" : "") |
| + (intr ? " (intr)" : "")); |
| if (wakeups > 1000) |
| throw new Exception("Too many wakeups"); |
| if (closed) |
| return; |
| if (wantInterrupt) { |
| while (!Thread.interrupted()) |
| Thread.yield(); |
| gotInterrupt = true; |
| wantInterrupt = false; |
| } |
| } |
| } |
| |
| } |
| |
| private static int checkedWakeups = 0; |
| |
| private static void check(Sleeper sleeper, boolean intr) |
| throws Exception |
| { |
| checkedWakeups++; |
| if (sleeper.wakeups > checkedWakeups) { |
| sleeper.finish(100); |
| throw new Exception("Sleeper has run ahead"); |
| } |
| int n = 0; |
| while (sleeper.wakeups < checkedWakeups) { |
| sleep(50); |
| if ((n += 50) > 1000) { |
| sleeper.finish(100); |
| throw new Exception("Sleeper appears to be dead (" |
| + checkedWakeups + ")"); |
| } |
| } |
| if (sleeper.wakeups > checkedWakeups) { |
| sleeper.finish(100); |
| throw new Exception("Too many wakeups: Expected " |
| + checkedWakeups |
| + ", got " + sleeper.wakeups); |
| } |
| if (intr) { |
| n = 0; |
| // Interrupts can sometimes be delayed, so wait |
| while (!sleeper.gotInterrupt) { |
| sleep(50); |
| if ((n += 50) > 1000) { |
| sleeper.finish(100); |
| throw new Exception("Interrupt never delivered"); |
| } |
| } |
| sleeper.gotInterrupt = false; |
| } |
| System.err.println("Check " + checkedWakeups |
| + (intr ? " (intr " + n + ")" : "")); |
| } |
| |
| public static void main(String[] args) throws Exception { |
| |
| Selector sel = Selector.open(); |
| |
| // Wakeup before select |
| sel.wakeup(); |
| |
| Sleeper sleeper = new Sleeper(sel); |
| |
| sleeper.start(); |
| while (!sleeper.started) |
| sleep(50); |
| |
| check(sleeper, false); // 1 |
| |
| for (int i = 2; i < 5; i++) { |
| // Wakeup during select |
| sel.wakeup(); |
| check(sleeper, false); // 2 .. 4 |
| } |
| |
| // Double wakeup |
| synchronized (sleeper.gate) { |
| sel.wakeup(); |
| check(sleeper, false); // 5 |
| sel.wakeup(); |
| sel.wakeup(); |
| } |
| check(sleeper, false); // 6 |
| |
| // Interrupt |
| synchronized (sleeper.gate) { |
| sleeper.wantInterrupt = true; |
| sleeper.interrupt(); |
| check(sleeper, true); // 7 |
| } |
| |
| // Interrupt before select |
| while (sleeper.entries < 8) |
| Thread.yield(); |
| synchronized (sleeper.gate) { |
| sel.wakeup(); |
| check(sleeper, false); // 8 |
| sleeper.wantInterrupt = true; |
| sleeper.interrupt(); |
| sleep(50); |
| } |
| check(sleeper, true); // 9 |
| |
| // Close during select |
| while (sleeper.entries < 10) |
| Thread.yield(); |
| synchronized (sleeper.gate) { |
| sel.close(); |
| check(sleeper, false); // 10 |
| } |
| |
| if (sleeper.finish(200) == 0) |
| throw new Exception("Test failed"); |
| if (!sleeper.closed) |
| throw new Exception("Selector not closed"); |
| } |
| |
| } |