RFR(XXS): Event based tracing framework needs a mutex for thread groups

[Markus Grönlund]

Greetings,

 

Kindly asking for reviews for the following:

 

Bugid: http://bugs.sun.com/view_bug.do?bug_id=8023457

 

Webrev: http://cr.openjdk.java.net/~mgronlun/8023457/webrev01/

 

Thanks

Markus
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