--- jsr166/src/test/tck/JSR166TestCase.java	2013/01/21 19:32:19	1.94
+++ jsr166/src/test/tck/JSR166TestCase.java	2013/01/21 19:51:46	1.96
@@ -11,6 +11,8 @@ import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
+import java.lang.management.ManagementFactory;
+import java.lang.management.ThreadInfo;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Date;
@@ -512,6 +514,16 @@ public class JSR166TestCase extends Test
     }
 
     /**
+     * A debugging tool to print all stack traces, as jstack does.
+     */
+    static void printAllStackTraces() {
+        for (ThreadInfo info :
+                 ManagementFactory.getThreadMXBean()
+                 .dumpAllThreads(true, true))
+            System.err.print(info);
+    }
+
+    /**
      * Checks that thread does not terminate within the default
      * millisecond delay of {@code timeoutMillis()}.
      */