Fix issue 833: eliminate race condition in ProfilerEventsProcessor.

src/cpu-profiler.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 28 matching lines @@
 namespace v8 {
 namespace internal {
 
 static const int kEventsBufferSize = 256*KB;
 static const int kTickSamplesBufferChunkSize = 64*KB;
 static const int kTickSamplesBufferChunksCount = 16;
 
 
 ProfilerEventsProcessor::ProfilerEventsProcessor(ProfileGenerator* generator)
     : generator_(generator),
-      running_(false),
+      running_(true),
       ticks_buffer_(sizeof(TickSampleEventRecord),
                     kTickSamplesBufferChunkSize,
                     kTickSamplesBufferChunksCount),
       enqueue_order_(0) {
 }
 
 
 void ProfilerEventsProcessor::CallbackCreateEvent(Logger::LogEventsAndTags tag,
                                                   const char* prefix,
                                                   String* name,
@@ skipping 180 matching lines @@
       ticks_buffer_.FinishDequeue();
     } else {
       return true;
     }
   }
 }
 
 
 void ProfilerEventsProcessor::Run() {
   unsigned dequeue_order = 0;
-  running_ = true;
 
   while (running_) {
     // Process ticks until we have any.
     if (ProcessTicks(dequeue_order)) {
       // All ticks of the current dequeue_order are processed,
       // proceed to the next code event.
       ProcessCodeEvent(&dequeue_order);
     }
     YieldCPU();
   }
@@ skipping 269 matching lines @@
 void CpuProfiler::TearDown() {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (singleton_ != NULL) {
     delete singleton_;
   }
   singleton_ = NULL;
 #endif
 }
 
 } }  // namespace v8::internal