8244679: JVM/TI GetCurrentContendedMonitor/contmon001 failed due to "(IsSameObject#3) unexpected monitor object: 0x000000562336DBA8"

Reviewed-by: pchilanomate, dcubed, dholmes, sspitsyn

Author: robehn

test/hotspot/jtreg/vmTestbase/nsk/jvmti/GetCurrentContendedMonitor/contmon001.java

@@ -23,7 +23,6 @@
 
 package nsk.jvmti.GetCurrentContendedMonitor;
 
-import nsk.share.Wicket;
 import java.io.PrintStream;
 
 public class contmon001 {
@@ -42,8 +41,8 @@ public class contmon001 {
         }
     }
 
-    public static Wicket startingBarrier;
-    public static Wicket waitingBarrier;
+    public static volatile boolean startingBarrier = true;
+    public static volatile boolean waitingBarrier = true;
     static Object lockFld = new Object();
 
     static boolean DEBUG_MODE = false;
@@ -55,6 +54,14 @@ public static void main(String[] args) {
         System.exit(run(args, System.out) + 95/*STATUS_TEMP*/);
     }
 
+    public static void doSleep() {
+        try {
+            Thread.sleep(10);
+        } catch (Exception e) {
+            throw new Error("Unexpected " + e);
+        }
+    }
+
     public static int run(String argv[], PrintStream ref) {
         out = ref;
         for (int i = 0; i < argv.length; i++) {
@@ -75,13 +82,13 @@ public static int run(String argv[], PrintStream ref) {
             out.println("Check #1 done");
 
         contmon001a thr = new contmon001a();
-        startingBarrier = new Wicket();
-        waitingBarrier = new Wicket();
 
         thr.start();
         if (DEBUG_MODE)
             out.println("\nWaiting for auxiliary thread ...");
-        startingBarrier.waitFor();
+        while (startingBarrier) {
+            doSleep();
+        }
         if (DEBUG_MODE)
             out.println("Auxiliary thread is ready");
 
@@ -93,7 +100,9 @@ public static int run(String argv[], PrintStream ref) {
 
         thr.letItGo();
 
-        waitingBarrier.waitFor();
+        while (waitingBarrier) {
+            doSleep();
+        }
         synchronized (lockFld) {
             if (DEBUG_MODE)
                 out.println("\nMain thread entered lockFld's monitor"
@@ -138,7 +147,7 @@ public void run() {
 
         if (contmon001.DEBUG_MODE)
             contmon001.out.println("notifying main thread");
-        contmon001.startingBarrier.unlock();
+        contmon001.startingBarrier = false;
 
         if (contmon001.DEBUG_MODE)
             contmon001.out.println("thread is going to loop while <flag> is true ...");
@@ -158,7 +167,7 @@ public void run() {
             contmon001.out.println("looping is done: <flag> is false");
 
         synchronized (contmon001.lockFld) {
-            contmon001.waitingBarrier.unlock();
+            contmon001.waitingBarrier = false;
             if (contmon001.DEBUG_MODE)
                 contmon001.out.println("\nthread entered lockFld's monitor"
                     + "\n\tand releasing it through the lockFld.wait() call");

test/hotspot/jtreg/vmTestbase/nsk/jvmti/GetCurrentContendedMonitor/contmon002.java

@@ -23,7 +23,6 @@
 
 package nsk.jvmti.GetCurrentContendedMonitor;
 
-import nsk.share.Wicket;
 import java.io.PrintStream;
 
 public class contmon002 {
@@ -42,21 +41,30 @@ public class contmon002 {
         }
     }
 
-    public static Wicket startingBarrier;
+    public static boolean startingBarrier = true;
 
     public static void main(String[] args) {
         args = nsk.share.jvmti.JVMTITest.commonInit(args);
 
         System.exit(run(args, System.out) + 95/*STATUS_TEMP*/);
     }
 
+    public static void doSleep() {
+        try {
+            Thread.sleep(10);
+        } catch (Exception e) {
+            throw new Error("Unexpected " + e);
+        }
+    }
+
     public static int run(String argv[], PrintStream ref) {
         checkMon(1, Thread.currentThread());
 
         contmon002a thr = new contmon002a();
-        startingBarrier = new Wicket();
         thr.start();
-        startingBarrier.waitFor();
+        while (startingBarrier) {
+            doSleep();
+        }
         checkMon(2, thr);
         thr.letItGo();
         try {
@@ -73,7 +81,7 @@ class contmon002a extends Thread {
     private volatile boolean flag = true;
 
     private synchronized void meth() {
-        contmon002.startingBarrier.unlock();
+        contmon002.startingBarrier = false;
         int i = 0;
         int n = 1000;
         while (flag) {