Commits on Jun 10, 2015

1. V8: avoid deadlock when profiling is active …

   A deadlock happens when sampler initiated by SIGPROF tries to lock
   the thread and the thread is already locked by the same thread. As
   a result, other thread involved in sampling process hangs. The
   patch adds a check for thread lock before continuing sampler
   operation.
   
   The fix has been tested on a sample app under load with and without
   profiling turned on.
   
   Fixes issue nodejs#14576 and specifically the duplicate issue nodejs#25295

   

   dmelikyan committed Jun 10, 2015
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