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/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
/**
* @test
* @bug 6869327
* @summary Test that C2 flag UseCountedLoopSafepoints ensures a safepoint is kept in a CountedLoop
* @library /testlibrary
* @run main UseCountedLoopSafepoints
*/
import java.util.concurrent.atomic.AtomicLong;
import com.oracle.java.testlibrary.ProcessTools;
import com.oracle.java.testlibrary.OutputAnalyzer;
public class UseCountedLoopSafepoints {
private static final AtomicLong _num = new AtomicLong(0);
// Uses the fact that an EnableBiasedLocking vmop will be started
// after 500ms, while we are still in the loop. If there is a
// safepoint in the counted loop, then we will reach safepoint
// very quickly. Otherwise SafepointTimeout will be hit.
public static void main (String args[]) throws Exception {
if (args.length == 1) {
final int loops = Integer.parseInt(args[0]);
for (int i = 0; i < loops; i++) {
_num.addAndGet(1);
}
} else {
ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
"-XX:+IgnoreUnrecognizedVMOptions",
"-XX:-TieredCompilation",
"-XX:+UseBiasedLocking",
"-XX:BiasedLockingStartupDelay=500",
"-XX:+SafepointTimeout",
"-XX:SafepointTimeoutDelay=2000",
"-XX:+UseCountedLoopSafepoints",
"UseCountedLoopSafepoints",
"2000000000"
);
OutputAnalyzer output = new OutputAnalyzer(pb.start());
output.shouldNotContain("Timeout detected");
output.shouldHaveExitValue(0);
}
}
}
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