71 lines
2.7 KiB
Java
71 lines
2.7 KiB
Java
/*
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* Copyright (c) 2024, 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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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.VarHandle;
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import java.util.ArrayList;
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/**
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* @test
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* @bug 8340812
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* @summary Verify that LambdaForm customization via MethodHandle::updateForm is thread safe.
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* @run main TestLambdaFormCustomization
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* @run main/othervm -Djava.lang.invoke.MethodHandle.CUSTOMIZE_THRESHOLD=0 TestLambdaFormCustomization
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*/
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public class TestLambdaFormCustomization {
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String str = "test";
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static final String value = "test" + 42;
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// Trigger concurrent LambdaForm customization for VarHandle invokers
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void test() throws NoSuchFieldException, IllegalAccessException {
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VarHandle varHandle = MethodHandles.lookup().in(getClass()).findVarHandle(getClass(), "str", String.class);
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ArrayList<Thread> threads = new ArrayList<>();
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for (int threadIdx = 0; threadIdx < 10; threadIdx++) {
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threads.add(new Thread(() -> {
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for (int i = 0; i < 1000; i++) {
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varHandle.compareAndExchange(this, value, value);
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varHandle.compareAndExchange(this, value, value);
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varHandle.compareAndExchange(this, value, value);
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}
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}));
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}
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threads.forEach(Thread::start);
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threads.forEach(t -> {
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try {
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t.join();
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} catch (Throwable e) {
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throw new IllegalStateException(e);
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}
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});
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}
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public static void main(String[] args) throws Exception {
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TestLambdaFormCustomization t = new TestLambdaFormCustomization();
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for (int i = 0; i < 4000; ++i) {
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t.test();
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}
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}
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}
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