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8305425: Thread.isAlive0 doesn't need to call into the VM
Reviewed-by: phh, mdoerr Backport-of: 35cb303a2c0c8b32de257c02e012a1928a6b4594
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Original file line number | Diff line number | Diff line change |
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/* | ||
* Copyright 2023, Amazon.com Inc. 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. | ||
*/ | ||
|
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/* | ||
* @test | ||
* @bug 8305425 | ||
* @summary Check Thread.isAlive | ||
* @run main/othervm/timeout=10 IsAlive | ||
*/ | ||
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public class IsAlive { | ||
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static boolean spinnerDone; | ||
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private static void spin() { | ||
try { | ||
while (!Thread.currentThread().isInterrupted()) { | ||
Thread.sleep(100); | ||
} | ||
} catch (InterruptedException ie) { | ||
// Do nothing, just exit | ||
} | ||
spinnerDone = true; | ||
} | ||
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static volatile boolean checkerReady; | ||
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private static void check(Thread t) { | ||
while (!t.isAlive()) { | ||
// Burn hard, without any sleeps. | ||
// Check that we discover the thread is alive eventually. | ||
} | ||
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checkerReady = true; | ||
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while (t.isAlive()) { | ||
// Burn hard, without any sleeps. | ||
// Check that we discover the thread is not alive eventually. | ||
} | ||
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if (!spinnerDone) { | ||
throw new RuntimeException("Last write of terminated thread was not seen!"); | ||
} | ||
} | ||
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private static void assertAlive(Thread t) { | ||
if (!t.isAlive()) { | ||
throw new IllegalStateException("Thread " + t + " is not alive, but it should be"); | ||
} | ||
} | ||
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private static void assertNotAlive(Thread t) { | ||
if (t.isAlive()) { | ||
throw new IllegalStateException("Thread " + t + " is alive, but it should not be"); | ||
} | ||
} | ||
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public static void main(String args[]) throws Exception { | ||
Thread spinner = new Thread(IsAlive::spin); | ||
spinner.setName("Spinner"); | ||
spinner.setDaemon(true); | ||
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Thread checker = new Thread(() -> check(spinner)); | ||
checker.setName("Checker"); | ||
checker.setDaemon(true); | ||
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assertNotAlive(spinner); | ||
assertNotAlive(checker); | ||
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System.out.println("Starting spinner"); | ||
spinner.start(); | ||
assertAlive(spinner); | ||
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System.out.println("Starting checker"); | ||
checker.start(); | ||
assertAlive(checker); | ||
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System.out.println("Waiting for checker to catch up"); | ||
while (!checkerReady) { | ||
Thread.sleep(100); | ||
} | ||
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System.out.println("Interrupting and joining spinner"); | ||
spinner.interrupt(); | ||
spinner.join(); | ||
assertNotAlive(spinner); | ||
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System.out.println("Joining checker"); | ||
checker.join(); | ||
assertNotAlive(checker); | ||
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System.out.println("Complete"); | ||
} | ||
} |
4fd0ee5
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