108 lines
3.4 KiB
Java
108 lines
3.4 KiB
Java
/*
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* Copyright (c) 2007, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package gc.cslocker;
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import static gc.testlibrary.Allocation.blackHole;
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/*
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* @test TestCSLocker
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* @bug 6186200
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* @library /
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* @summary This short test check RFE 6186200 changes. One thread locked
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* @summary completely in JNI CS, while other is trying to allocate memory
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* @summary provoking GC. OOM means FAIL, deadlock means PASS.
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*
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* @comment This test assumes that no allocation happens during the sleep loop,
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* which is something that we can't guarantee. With ZGC we see test
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* timeouts because the main thread allocates and waits for the GC,
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* which waits for the CSLocker, which waits for the main thread.
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* @requires vm.gc != "Z"
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*
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* @run main/native/othervm -Xmx256m gc.cslocker.TestCSLocker
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*/
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public class TestCSLocker extends Thread
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{
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static int timeoutMillis = 5000;
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public static void main(String args[]) throws Exception {
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// start garbage producer thread
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GarbageProducer garbageProducer = new GarbageProducer(1000000, 10);
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garbageProducer.start();
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// start CS locker thread
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CSLocker csLocker = new CSLocker();
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csLocker.start();
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// After the CSLocker thread has started, any operation such as an allocation,
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// which could rely on the GC to make progress, will cause a deadlock that will
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// make the test time out. That includes printing. Please don't use any such
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// code until unlock() is called below.
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// check timeout to success deadlocking
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sleep(timeoutMillis);
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csLocker.unlock();
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garbageProducer.interrupt();
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}
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}
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class GarbageProducer extends Thread
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{
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private int size;
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private int sleepTime;
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GarbageProducer(int size, int sleepTime) {
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this.size = size;
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this.sleepTime = sleepTime;
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}
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public void run() {
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boolean isRunning = true;
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while (isRunning) {
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try {
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blackHole(new int[size]);
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sleep(sleepTime);
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} catch (InterruptedException e) {
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isRunning = false;
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}
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}
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}
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}
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class CSLocker extends Thread
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{
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static { System.loadLibrary("TestCSLocker"); }
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public void run() {
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int[] a = new int[10];
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a[0] = 1;
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if (!lock(a)) {
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throw new RuntimeException("failed to acquire CSLock");
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}
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}
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native boolean lock(int[] array);
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native void unlock();
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}
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