RFR 6309226: TEST: java/lang/management/ThreadMXBean/SynchronizationStatistics.java didn't check Thread.sleep

[Jaroslav Bachorik]

Please, review this small patch for a test failing due to the updated 
implementation in JDK6.

Issue:  https://bugs.openjdk.java.net/browse/JDK-6309226
Webrev: http://cr.openjdk.java.net/~jbachorik/6309226/webrev.00/

The test fails due to the change in mustang where 
ThreadMXBean.getThreadInfo().getWaitedTime() and 
ThreadMXBean.getThreadInfo().getWaitedCount() include Thread.sleep() 
too. Unfortunately, Thread.sleep() is used throughout the test for 
synchronization purposes and this breaks the test.

In the patch I propose to replace Thread.sleep() with busy wait and 
hinting the scheduler by Thread.yield(). While not very elegant it 
successfully works around inclusion of unknown number of Thread.sleep()s 
(they are called in loop).

Thanks,

-JB-