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/*
* Copyright (c) 2001, 2016, 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 .. /lib/testlibrary/
*/
import java.io.*;
import java.net.*;
import java.nio.*;
import java.nio.channels.*;
import java.util.concurrent.CyclicBarrier;
public class Wakeup {
static void sleep(int millis) {
try {
Thread.sleep(millis);
} catch (InterruptedException x) {
x.printStackTrace();
}
}
static class Sleeper extends TestThread {
private static final long TIMEOUT = jdk.testlibrary.Utils.adjustTimeout(20_000);
// barrier is used to synchronize sleeper thread and checking
// thread which is the main thread: when go() get to the end,
// then start checking the sleeper's status.
private static CyclicBarrier barrier = new CyclicBarrier(2);
private static int wakeups = 0;
private static int waits = 0;
volatile boolean interruptBeforeSelect = false;
volatile boolean started = false;
volatile boolean wantInterrupt = false;
volatile boolean closed = false;
Object gate = new Object();
Selector sel;
Sleeper(Selector sel, boolean wantInterrupt, boolean interruptBeforeSelect) {
super("Sleeper", System.err);
this.sel = sel;
this.wantInterrupt = wantInterrupt;
this.interruptBeforeSelect = interruptBeforeSelect;
}
public void go() throws Exception {
started = true;
if (interruptBeforeSelect) {
synchronized (gate) { }
}
wakeups++;
System.err.println("Wakeup, selecting, " + wakeups);
try {
sel.select();
} catch (ClosedSelectorException x) {
closed = true;
}
boolean intr = Thread.currentThread().isInterrupted();
System.err.println("Wakeup " + wakeups
+ (closed ? " (closed)" : "")
+ (intr ? " (intr)" : ""));
if (closed)
return;
if (wantInterrupt) {
while (!Thread.interrupted())
Thread.yield();
}
System.err.println("Wakeup, waiting, " + wakeups);
barrier.await();
System.err.println("Wakeup, wait successfully, " + wakeups);
}
void check(boolean close) throws Exception {
waits++;
System.err.println("waiting sleeper, " + waits);
if (!close) {
barrier.await();
System.err.println("wait barrier successfully, " + waits);
}
if (finish(TIMEOUT) == 0)
throw new Exception("Test failed");
if (this.closed != close)
throw new Exception("Selector was closed");
}
void check() throws Exception {
check(false);
}
static Sleeper createSleeper(Selector sel, boolean wantInterrupt,
boolean interruptBeforeSelect) throws Exception {
if (!wantInterrupt && interruptBeforeSelect) {
throw new RuntimeException("Wrong parameters!");
}
Sleeper sleeper = new Sleeper(sel, wantInterrupt, interruptBeforeSelect);
if (interruptBeforeSelect) {
synchronized(sleeper.gate) {
sleeper.start();
while (!sleeper.started)
sleep(50);
sleeper.interrupt();
}
} else {
sleeper.start();
while (!sleeper.started)
sleep(50);
if (wantInterrupt) {
sleep(50);
sleeper.interrupt();
}
}
return sleeper;
}
}
static Sleeper newSleeper(Selector sel) throws Exception {
return Sleeper.createSleeper(sel, false, false);
}
static Sleeper newSleeperWantInterrupt(Selector sel) throws Exception {
return Sleeper.createSleeper(sel, true, false);
}
static Sleeper newSleeperWantInterruptBeforeSelect(Selector sel) throws Exception {
return Sleeper.createSleeper(sel, true, true);
}
public static void main(String[] args) throws Exception {
Selector sel = Selector.open();
// Wakeup before select
sel.wakeup();
Sleeper sleeper = newSleeper(sel); // 1
sleeper.check();
for (int i = 2; i < 5; i++) {
// Wakeup during select
sleeper = newSleeper(sel);
sel.wakeup();
sleeper.check(); // 2 .. 4
}
// Double wakeup
sel.wakeup();
sel.wakeup();
sleeper = newSleeper(sel);
sleeper.check(); // 5
// Interrupt
sleeper = newSleeperWantInterrupt(sel);
sleeper.check(); // 6
// Interrupt before select
sleeper = newSleeperWantInterruptBeforeSelect(sel);
sleeper.check(); // 7
// Close during select
sleeper = newSleeper(sel);
sel.close();
sleeper.check(); // 8
sleeper = newSleeper(sel);
sleeper.check(true);
}
}
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