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test/hotspot/jtreg/serviceability/jvmti/GetOwnedMonitorInfo/GetOwnedMonitorInfoTest.java

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  7  * published by the Free Software Foundation.
  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  */
 23 
 24 
 25 /**
 26  * @test
 27  * @bug 8185164
 28  * @summary Checks that a contended monitor does not show up in the list of owned monitors


 29  * @requires vm.jvmti
 30  * @compile GetOwnedMonitorInfoTest.java
 31  * @run main/othervm/native -agentlib:GetOwnedMonitorInfoTest GetOwnedMonitorInfoTest
 32  */
 33 
 34 import java.io.PrintStream;
 35 
 36 public class GetOwnedMonitorInfoTest {
 37 
 38     static {
 39         try {
 40             System.loadLibrary("GetOwnedMonitorInfoTest");
 41         } catch (UnsatisfiedLinkError ule) {
 42             System.err.println("Could not load GetOwnedMonitorInfoTest library");
 43             System.err.println("java.library.path: "
 44                                + System.getProperty("java.library.path"));
 45             throw ule;
 46         }
 47     }
 48 

 49     private static native int check();
 50     private static native boolean hasEventPosted();
 51 














 52     public static void main(String[] args) throws Exception {
 53         runTest(true);
 54         runTest(false);


 55     }
 56 
 57     public static void runTest(boolean isVirtual) throws Exception {
 58         var threadFactory = isVirtual ? Thread.ofVirtual().factory() : Thread.ofPlatform().factory();
 59         final GetOwnedMonitorInfoTest lock = new GetOwnedMonitorInfoTest();
 60 
 61         Thread t1 = threadFactory.newThread(() -> {






 62             synchronized (lock) {
 63                 System.out.println("Thread in sync section: "
 64                                    + Thread.currentThread().getName());
 65             }
 66         });
 67 
 68         // Make sure t1 contends on the monitor.
 69         synchronized (lock) {
 70             System.out.println("Main starting worker thread.");
 71             t1.start();
 72 
 73             // Wait for the MonitorContendedEnter event
 74             while (!hasEventPosted()) {
 75                 System.out.println("Main waiting for event.");
 76                 Thread.sleep(100);
 77             }
 78         }
 79 
 80         t1.join();
 81 

  7  * published by the Free Software Foundation.
  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  */
 23 
 24 
 25 /**
 26  * @test
 27  * @bug 8185164 8320515
 28  * @summary Checks that a contended monitor does not show up in the list of owned monitors.
 29  *          8320515 piggy-backs on this test and injects an owned monitor with a dead object,
 30             and checks that that monitor isn't exposed to GetOwnedMonitorInfo.
 31  * @requires vm.jvmti
 32  * @compile GetOwnedMonitorInfoTest.java
 33  * @run main/othervm/native -agentlib:GetOwnedMonitorInfoTest GetOwnedMonitorInfoTest
 34  */
 35 
 36 import java.io.PrintStream;
 37 
 38 public class GetOwnedMonitorInfoTest {
 39 
 40     static {
 41         try {
 42             System.loadLibrary("GetOwnedMonitorInfoTest");
 43         } catch (UnsatisfiedLinkError ule) {
 44             System.err.println("Could not load GetOwnedMonitorInfoTest library");
 45             System.err.println("java.library.path: "
 46                                + System.getProperty("java.library.path"));
 47             throw ule;
 48         }
 49     }
 50 
 51     private static native void jniMonitorEnter(Object obj);
 52     private static native int check();
 53     private static native boolean hasEventPosted();
 54 
 55     private static void jniMonitorEnterAndLetObjectDie() {
 56         // The monitor iterator used by GetOwnedMonitorInfo used to
 57         // assert when an owned monitor with a dead object was found.
 58         // Inject this situation into this test that performs other
 59         // GetOwnedMonitorInfo testing.
 60         Object obj = new Object() {};
 61         jniMonitorEnter(obj);
 62         if (!Thread.holdsLock(obj)) {
 63             throw new RuntimeException("The object is not locked");
 64         }
 65         obj = null;
 66         System.gc();
 67     }
 68 
 69     public static void main(String[] args) throws Exception {
 70         runTest(true, true);
 71         runTest(true, false);
 72         runTest(false, true);
 73         runTest(false, false);
 74     }
 75 
 76     public static void runTest(boolean isVirtual, boolean jni) throws Exception {
 77         var threadFactory = isVirtual ? Thread.ofVirtual().factory() : Thread.ofPlatform().factory();
 78         final GetOwnedMonitorInfoTest lock = new GetOwnedMonitorInfoTest();
 79 
 80         Thread t1 = threadFactory.newThread(() -> {
 81             Thread.currentThread().setName("Worker-Thread");
 82 
 83             if (jni) {
 84                 jniMonitorEnterAndLetObjectDie();
 85             }
 86 
 87             synchronized (lock) {
 88                 System.out.println("Thread in sync section: "
 89                                    + Thread.currentThread().getName());
 90             }
 91         });
 92 
 93         // Make sure t1 contends on the monitor.
 94         synchronized (lock) {
 95             System.out.println("Main starting worker thread.");
 96             t1.start();
 97 
 98             // Wait for the MonitorContendedEnter event
 99             while (!hasEventPosted()) {
100                 System.out.println("Main waiting for event.");
101                 Thread.sleep(100);
102             }
103         }
104 
105         t1.join();
106 
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