Instrument callers of Semaphore::Signal to help with investigation of

src/log.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/log.h"
 
 #include <cstdarg>
 #include <sstream>
 
 #include "src/bailout-reason.h"
@@ skipping 543 matching lines @@
   // Inserts collected profiling data into buffer.
   void Insert(TickSample* sample) {
     if (paused_)
       return;
 
     if (Succ(head_) == static_cast<int>(base::NoBarrier_Load(&tail_))) {
       overflow_ = true;
     } else {
       buffer_[head_] = *sample;
       head_ = Succ(head_);
-      buffer_semaphore_.Signal();  // Tell we have an element.
+      buffer_semaphore_.Signal("Profiler::Insert");  // Tell we have an element.
     }
   }
 
   virtual void Run();
 
   // Pause and Resume TickSample data collection.
   void pause() { paused_ = true; }
   void resume() { paused_ = false; }
 
  private:
@@ skipping 1276 matching lines @@
     removeCodeEventListener(jit_logger_);
     delete jit_logger_;
     jit_logger_ = NULL;
   }
 
   return log_->Close();
 }
 
 }  // namespace internal
 }  // namespace v8