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/*

 * @test TestParallelGCThreads

 * @key gc

 * @bug 8059527

 * @summary Tests argument processing for ParallelGCThreads

 * @library /testlibrary

 * @run driver TestParallelGCThreads

 */

import com.oracle.java.testlibrary.*;

public class TestParallelGCThreads {

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

    // For each parallel collector (G1, Parallel, ParNew/CMS)

    for (String gc : new String[] {"G1", "Parallel", "ConcMarkSweep"}) {

      // Make sure the VM does not allow ParallelGCThreads set to 0

      String[] flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=0", "-XX:+PrintFlagsFinal", "-version"};

      ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags);

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

      output.shouldHaveExitValue(1);

      // Do some basic testing to ensure the flag updates the count

      for (long i = 1; i <= 3; i++) {

        flags = new String[] {"-XX:+Use" + gc + "GC", "-XX:ParallelGCThreads=" + i, "-XX:+PrintFlagsFinal", "-version"};

        long count = getParallelGCThreadCount(flags);

        Asserts.assertEQ(count, i, "Specifying ParallelGCThreads=" + i + " for " + gc + "GC does not set the thread count properly!");

      }

    }

  }

  public static long getParallelGCThreadCount(String flags[]) throws Exception {

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags);

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

    output.shouldHaveExitValue(0);

    String stdout = output.getStdout();

    return FlagsValue.getFlagLongValue("ParallelGCThreads", stdout);

  }

}