53 lines
1.8 KiB
Java
53 lines
1.8 KiB
Java
/*
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* Copyright (c) 2017, Red Hat Inc. 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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/**
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* @test
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* @bug 8175887
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* @summary C1 doesn't respect the JMM with volatile field loads
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*
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* @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:TieredStopAtLevel=1 VolatileGuardTest
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*/
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public class VolatileGuardTest {
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volatile static private int a;
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static private int b;
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static void test() {
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int tt = b; // makes the JVM CSE the value of b
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while (a == 0) {} // burn
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if (b == 0) {
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System.err.println("wrong value of b");
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System.exit(1); // fail hard to report the error
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}
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}
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public static void main(String [] args) throws Exception {
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for (int i = 0; i < 10; i++) {
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new Thread(VolatileGuardTest::test).start();
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}
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b = 1;
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a = 1;
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}
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}
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