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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 *

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 * 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

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 *

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/*

 * @test TestInitialGCThreadLogging

 * @bug 8157240

 * @summary Check trace logging of initial GC threads.

 * @requires vm.gc=="null"

 * @key gc

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

 * @library /testlibrary

 */

import jdk.test.lib.ProcessTools;

import jdk.test.lib.OutputAnalyzer;

public class TestInitialGCThreadLogging {

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

    testInitialGCThreadLogging("UseConcMarkSweepGC", "GC Thread");

    testInitialGCThreadLogging("UseG1GC", "GC Thread");

    testInitialGCThreadLogging("UseParallelGC", "ParGC Thread");

  }

  private static void verifyDynamicNumberOfGCThreads(OutputAnalyzer output, String threadName) {

    output.shouldHaveExitValue(0); // test should run succesfully

    output.shouldContain(threadName);

  }

  private static void testInitialGCThreadLogging(String gcFlag, String threadName) throws Exception {

    // UseDynamicNumberOfGCThreads and TraceDynamicGCThreads enabled

    String[] baseArgs = {"-XX:+" + gcFlag, "-Xmx10M", "-XX:+UseDynamicNumberOfGCThreads", "-Xlog:gc+task=trace", "-version"};

    // Base test with gc and +UseDynamicNumberOfGCThreads:

    ProcessBuilder pb_enabled = ProcessTools.createJavaProcessBuilder(baseArgs);

    verifyDynamicNumberOfGCThreads(new OutputAnalyzer(pb_enabled.start()), threadName);

  }

}