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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package runtime.whitebox;

/*
 * @test TestWBDeflateIdleMonitors
 * @bug 8246477
 * @summary Test verify that WB method deflateIdleMonitors works correctly.
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @build sun.hotspot.WhiteBox
 * @run driver ClassFileInstaller sun.hotspot.WhiteBox
 * @run driver runtime.whitebox.TestWBDeflateIdleMonitors
 */
import jdk.test.lib.Asserts;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
import sun.hotspot.WhiteBox;

public class TestWBDeflateIdleMonitors {

    public static void main(String args[]) throws Exception {
        ProcessBuilder pb = ProcessTools.createTestJvm(
                "-Xbootclasspath/a:.",
                "-XX:+UnlockDiagnosticVMOptions",
                "-XX:+WhiteBoxAPI",
                "-Xlog:monitorinflation=info",
                InflateMonitorsTest.class.getName());

        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        System.out.println(output.getStdout());
        output.shouldHaveExitValue(0);
        output.shouldContain("WhiteBox initiated DeflateIdleMonitors");
    }

    public static class InflateMonitorsTest {
        static WhiteBox wb = WhiteBox.getWhiteBox();
        public static Object obj;

        public static void main(String args[]) {
            obj = new Object();
            synchronized (obj) {
                // HotSpot implementation detail: asking for the hash code
                // when the object is locked causes monitor inflation.
                if (obj.hashCode() == 0xBAD) System.out.println("!");
                Asserts.assertEQ(wb.isMonitorInflated(obj), true,
                                 "Monitor should be inflated.");
            }
            boolean did_deflation = wb.deflateIdleMonitors();
            Asserts.assertEQ(did_deflation, true,
                             "deflateIdleMonitors() should have worked.");
            Asserts.assertEQ(wb.isMonitorInflated(obj), false,
                             "Monitor should be deflated.");
        }
    }
}