5dbf13730e
Co-authored-by: Stefan Karlsson <stefank@openjdk.org> Co-authored-by: Erik Österlund <eosterlund@openjdk.org> Reviewed-by: rkennke, dcubed, coleenp, stefank
109 lines
3.7 KiB
Java
109 lines
3.7 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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*/
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/*
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* @test TestLockStackCapacity
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* @summary Tests the interaction between recursive lightweight locking and
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* when the lock stack capacity is exceeded.
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* @requires vm.flagless
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* @library /testlibrary /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xint -XX:LockingMode=2 TestLockStackCapacity
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*/
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import jdk.test.lib.Asserts;
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import jdk.test.whitebox.WhiteBox;
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import jtreg.SkippedException;
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public class TestLockStackCapacity {
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static final WhiteBox WB = WhiteBox.getWhiteBox();
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static final int LockingMode = WB.getIntVMFlag("LockingMode").intValue();
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static final int LM_LIGHTWEIGHT = 2;
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static class SynchronizedObject {
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static final SynchronizedObject OUTER = new SynchronizedObject();
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static final SynchronizedObject INNER = new SynchronizedObject();
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static final int LockStackCapacity = WB.getLockStackCapacity();
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synchronized void runInner(int depth) {
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assertNotInflated();
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if (depth == 1) {
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return;
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} else {
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runInner(depth - 1);
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}
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assertNotInflated();
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}
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synchronized void runOuter(int depth, SynchronizedObject inner) {
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assertNotInflated();
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if (depth == 1) {
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inner.runInner(LockStackCapacity);
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} else {
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runOuter(depth - 1, inner);
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}
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assertInflated();
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}
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public static void runTest() {
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// Test Requires a capacity of at least 2.
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Asserts.assertGTE(LockStackCapacity, 2);
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// Just checking
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OUTER.assertNotInflated();
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INNER.assertNotInflated();
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synchronized(OUTER) {
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OUTER.assertNotInflated();
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INNER.assertNotInflated();
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OUTER.runOuter(LockStackCapacity - 1, INNER);
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OUTER.assertInflated();
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INNER.assertNotInflated();
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}
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}
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void assertNotInflated() {
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Asserts.assertFalse(WB.isMonitorInflated(this));
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}
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void assertInflated() {
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Asserts.assertTrue(WB.isMonitorInflated(this));
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}
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}
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public static void main(String... args) throws Exception {
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if (LockingMode != LM_LIGHTWEIGHT) {
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throw new SkippedException("Test only valid for LM_LIGHTWEIGHT");
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}
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if (!WB.supportsRecursiveLightweightLocking()) {
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throw new SkippedException("Test only valid if LM_LIGHTWEIGHT supports recursion");
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}
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SynchronizedObject.runTest();
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}
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}
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