Deadlock with custom ClassLoader about aprof HOT 6 CLOSED

Because of low level instrumentation AProf should avoid using extra locks in runtime support code e.g.ClassInfoCache should be nonblocking cache

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AProf build 30

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Can you, please, create a small self-contained test to reproduce this problem?

P.S. Deadlock happes during transformation phase. The synchnonization is there for a reason. It ensures that class hierarchy information is loaded before transformation of a class. This deadlock means that this caching infrastructure has to be reworked and that is why a reproducible test is needed.

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Even though I have a general idea on how to fix it... Better be able to verify a fix.

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I've changed the classes meta-info cache to a more finer-grained locking and I'm not sure if that hepls. Try this one, please: https://dl.dropboxusercontent.com/u/29617270/aprof-31-SNAPSHOT-bin.zip

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It works so far as expected (when I used aprof with debugger, deadlock was reproducible in 50% of launches)

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