TestConcMarkCycleWB.java

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/*
 * @test TestConMarkCycleWB
 * @bug 8065579
 * @requires vm.gc=="null" | vm.gc=="G1"
 * @library /testlibrary /testlibrary/whitebox
 * @build ClassFileInstaller com.oracle.java.testlibrary.* sun.hotspot.WhiteBox TestConcMarkCycleWB
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 *                              sun.hotspot.WhiteBox$WhiteBoxPermission
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC TestConcMarkCycleWB
 * @summary Verifies that ConcurrentMarking-related WB works properly
 */
import static com.oracle.java.testlibrary.Asserts.assertFalse;
import static com.oracle.java.testlibrary.Asserts.assertTrue;
import sun.hotspot.WhiteBox;

public class TestConcMarkCycleWB {

    public static void main(String[] args) throws Exception {
        WhiteBox wb = WhiteBox.getWhiteBox();

        wb.youngGC();
        assertTrue(wb.g1StartConcMarkCycle());
        while (wb.g1InConcurrentMark()) {
            Thread.sleep(5);
        }

        wb.fullGC();
        assertTrue(wb.g1StartConcMarkCycle());
        while (wb.g1InConcurrentMark()) {
            Thread.sleep(5);
        }
        assertTrue(wb.g1StartConcMarkCycle());
    }
}