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/*
* Copyright (c) 2022, 2023, 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
* @summary Test Thread.join(Duration)
* @run junit JoinWithDuration
*/
import java.time.Duration;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.LockSupport;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
class JoinWithDuration {
/**
* Test join on unstarted thread.
*/
@Test
void testJoinOnUnstartedThread() {
var thread = new Thread(() -> { });
assertThrows(IllegalThreadStateException.class,
() -> thread.join(Duration.ofNanos(-100)));
assertThrows(IllegalThreadStateException.class,
() -> thread.join(Duration.ofNanos(0)));
assertThrows(IllegalThreadStateException.class,
() -> thread.join(Duration.ofNanos(100)));
}
/**
* Test join on thread that does not terminate while waiting.
*/
@Test
void testJoinOnRunningThread() throws Exception {
var thread = new Thread(LockSupport::park);
thread.start();
try {
assertFalse(thread.join(Duration.ofNanos(-100)));
assertFalse(thread.join(Duration.ofNanos(0)));
assertFalse(thread.join(Duration.ofNanos(100)));
// test duration of join
long start = millisTime();
assertFalse(thread.join(Duration.ofMillis(2000)));
expectDuration(start, /*min*/1900, /*max*/20_000);
} finally {
LockSupport.unpark(thread);
thread.join();
}
}
/**
* Test join on thread that terminates while waiting.
*/
@Test
void testJoinOnTerminatingThread() throws Exception {
var thread = new Thread(() -> {
try {
Thread.sleep(50);
} catch (InterruptedException e) { }
});
thread.start();
assertTrue(thread.join(Duration.ofMinutes(1)));
}
/**
* Test join on terminated thread.
*/
@Test
void testJoinOnTerminatedThread() throws Exception {
var thread = new Thread(() -> { });
thread.start();
thread.join();
assertTrue(thread.join(Duration.ofNanos(-100)));
assertTrue(thread.join(Duration.ofNanos(0)));
assertTrue(thread.join(Duration.ofNanos(100)));
}
/**
* Test invoking join with interrupt status set.
*/
@Test
void testJoinWithInterruptStatusSet() throws Exception {
var thread = new Thread(LockSupport::park);
thread.start();
Thread.currentThread().interrupt();
try {
assertThrows(InterruptedException.class,
() -> thread.join(Duration.ofMinutes(1)));
assertFalse(Thread.currentThread().isInterrupted());
} finally {
Thread.interrupted();
LockSupport.unpark(thread);
thread.join();
}
}
/**
* Test interrupting join.
*/
@Test
void testInterruptJoin() throws Exception {
// schedule current thread to be interrupted after 1s
Thread targetThread = Thread.currentThread();
Thread wakerThread = new Thread(() -> {
try {
Thread.sleep(1000);
targetThread.interrupt();
} catch (Exception e) {
e.printStackTrace();
}
});
wakerThread.start();
var thread = new Thread(LockSupport::park);
thread.start();
try {
thread.join(Duration.ofMinutes(1));
fail();
} catch (InterruptedException e) {
// interrupt status should be cleared
assertFalse(thread.isInterrupted());
} finally {
LockSupport.unpark(thread);
thread.join();
wakerThread.join();
}
}
/**
* Test join on current thread.
*/
@Test
void testJoinSelf() throws Exception {
Thread thread = Thread.currentThread();
assertFalse(thread.join(Duration.ofNanos(-100)));
assertFalse(thread.join(Duration.ofNanos(0)));
assertFalse(thread.join(Duration.ofNanos(100)));
// test duration of join
long start = millisTime();
assertFalse(thread.join(Duration.ofMillis(2000)));
expectDuration(start, /*min*/1900, /*max*/20_000);
}
/**
* Test join(null).
*/
@Test
void testJoinNull() throws Exception {
var thread = new Thread(LockSupport::park);
// unstarted
assertThrows(NullPointerException.class, () -> thread.join(null));
// started
thread.start();
try {
assertThrows(NullPointerException.class, () -> thread.join(null));
} finally {
LockSupport.unpark(thread);
}
thread.join();
// terminated
assertThrows(NullPointerException.class, () -> thread.join(null));
}
/**
* Returns the current time in milliseconds.
*/
private static long millisTime() {
long now = System.nanoTime();
return TimeUnit.MILLISECONDS.convert(now, TimeUnit.NANOSECONDS);
}
/**
* Check the duration of a task
* @param start start time, in milliseconds
* @param min minimum expected duration, in milliseconds
* @param max maximum expected duration, in milliseconds
* @return the duration (now - start), in milliseconds
*/
private static void expectDuration(long start, long min, long max) {
long duration = millisTime() - start;
assertTrue(duration >= min,
"Duration " + duration + "ms, expected >= " + min + "ms");
assertTrue(duration <= max,
"Duration " + duration + "ms, expected <= " + max + "ms");
}
}
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