test/hotspot/jtreg/serviceability/jvmti/thread/GetFrameCount/framecnt01/framecnt01.java

@@ -72,11 +72,13 @@
          });
          while (!vThread1Started) {
              Thread.sleep(1);
          }
          // Let vthread1 to park
-         Thread.sleep(100);
+         while(vThread1.getState() != Thread.State.WAITING) {
+             Thread.sleep(1);
+         }
  
          // this is too fragile, implementation can change at any time.
          checkFrames(vThread1, false, 14);
          LockSupport.unpark(vThread1);
          vThread1.join();

@@ -93,11 +95,14 @@
                  LockSupport.park();
          });
          while (!pThread1Started) {
              Thread.sleep(1);
          }
-         Thread.sleep(10);
+ 
+         while(pThread1.getState() != Thread.State.WAITING) {
+             Thread.sleep(1);
+         }
          checkFrames(pThread1, false, 5);
          LockSupport.unpark(pThread1);
          pThread1.join();