8210558: serviceability/sa/TestJhsdbJstackLock.java fails to find '^\s+- waiting to lock <0x[0-9a-f]+> \(a java\.lang\.Class ...'

Reviewed-by: kevinw, sspitsyn

Author: plummercj

test/hotspot/jtreg/serviceability/sa/LingeredAppWithLock.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -47,6 +47,19 @@ public static void main(String args[]) {
         objectLock.start();
         primitiveLock.start();
 
+        // Wait until all threads have reached their blocked or timed wait state
+        while ((classLock1.getState() != Thread.State.BLOCKED &&
+                classLock1.getState() != Thread.State.TIMED_WAITING) ||
+               (classLock2.getState() != Thread.State.BLOCKED &&
+                classLock2.getState() != Thread.State.TIMED_WAITING) ||
+               (objectLock.getState() != Thread.State.TIMED_WAITING) ||
+               (primitiveLock.getState() != Thread.State.TIMED_WAITING)) {
+            try {
+                Thread.sleep(100);
+            } catch (InterruptedException ex) {
+            }
+        }
+
         LingeredApp.main(args);
     }
  }