UseCountedLoopSafepoints.java revision 11707:ad7af1afda7a 
1/*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
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16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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23 */
24
25/**
26 * @test
27 * @bug 6869327
28 * @summary Test that C2 flag UseCountedLoopSafepoints ensures a safepoint is kept in a CountedLoop
29 * @library /testlibrary
30 * @modules java.base/jdk.internal.misc
31 * @ignore 8146096
32 * @run driver compiler.loopopts.UseCountedLoopSafepoints
33 */
34
35package compiler.loopopts;
36
37import jdk.test.lib.OutputAnalyzer;
38import jdk.test.lib.ProcessTools;
39
40import java.util.concurrent.atomic.AtomicLong;
41
42public class UseCountedLoopSafepoints {
43    private static final AtomicLong _num = new AtomicLong(0);
44
45    // Uses the fact that an EnableBiasedLocking vmop will be started
46    // after 500ms, while we are still in the loop. If there is a
47    // safepoint in the counted loop, then we will reach safepoint
48    // very quickly. Otherwise SafepointTimeout will be hit.
49    public static void main (String args[]) throws Exception {
50        if (args.length == 1) {
51            final int loops = Integer.parseInt(args[0]);
52            for (int i = 0; i < loops; i++) {
53                _num.addAndGet(1);
54            }
55        } else {
56            ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
57                    "-XX:+IgnoreUnrecognizedVMOptions",
58                    "-XX:-TieredCompilation",
59                    "-XX:+UseBiasedLocking",
60                    "-XX:BiasedLockingStartupDelay=500",
61                    "-XX:+SafepointTimeout",
62                    "-XX:SafepointTimeoutDelay=2000",
63                    "-XX:+UseCountedLoopSafepoints",
64                    UseCountedLoopSafepoints.class.getName(),
65                    "2000000000"
66                    );
67            OutputAnalyzer output = new OutputAnalyzer(pb.start());
68            output.shouldNotContain("Timeout detected");
69            output.shouldHaveExitValue(0);
70        }
71    }
72}
73