/*

 * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved.

 *

 * 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 TestThreadCounts

 * @summary Test that Shenandoah GC thread counts are handled well

 * @key gc

 * @requires vm.gc.Shenandoah & !vm.graal.enabled

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @run driver TestThreadCounts

 */

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

public class TestThreadCounts {

    public static void main(String[] args) throws Exception {

        for (int conc = 0; conc < 16; conc++) {

            for (int par = 0; par < 16; par++) {

                testWith(conc, par);

            }

        }

    }

    private static void testWith(int conc, int par) throws Exception {

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions",

                "-XX:+UnlockExperimentalVMOptions",

                "-XX:+UseShenandoahGC",

                "-XX:ConcGCThreads=" + conc,

                "-XX:ParallelGCThreads=" + par,

                "-version");

        OutputAnalyzer output = new OutputAnalyzer(pb.start());

        if (conc == 0) {

            output.shouldContain("Shenandoah expects ConcGCThreads > 0");

            output.shouldHaveExitValue(1);

        } else if (par == 0) {

            output.shouldContain("Shenandoah expects ParallelGCThreads > 0");

            output.shouldHaveExitValue(1);

        } else if (conc > par) {

            output.shouldContain("Shenandoah expects ConcGCThreads <= ParallelGCThreads");

            output.shouldHaveExitValue(1);

        } else {

            output.shouldNotContain("Shenandoah expects ConcGCThreads <= ParallelGCThreads");

            output.shouldHaveExitValue(0);

        }

    }

}