[SPARK-1615] Synchronize accesses to the LiveListenerBus' event queue#544

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andrewor14 wants to merge 3 commits intoapache:masterfrom

andrewor14:stage-info-test-fix

Commits on Apr 25, 2014

Synchronize accesses to the LiveListenerBus' event queue
andrewor14
committed
Check if event is actually added before releasing semaphore
andrewor14
committed
Merge github.com:apache/spark into stage-info-test-fix
andrewor14
committed