Support higher CPU profiler sampling rate on Windows

src/sampler.cc

 // Copyright 2013 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 593 matching lines @@
   Tick(sample);
   if (sample != &sample_obj) {
     isolate_->cpu_profiler()->FinishTickSample();
   }
 }
 
 
 bool Sampler::CanSampleOnProfilerEventsProcessorThread() {
 #if defined(USE_SIGNALS)
   return true;
+#elif defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)

[Benedikt Meurer, 2013/08/27 14:02:43]

You don't need to test for _WIN64, since _WIN32 is defined for both 32 and 64
bit windows.
Please convert to use V8_OS_* macros, so we can get rid of this platform
specific defines at some point:

#elif V8_OS_WIN || V8_OS_CYGWIN

[yurys, 2013/08/27 15:56:27]

Done.

+  return true;
 #else
   return false;
 #endif
 }
 
 
 #if defined(USE_SIGNALS)
 
 void Sampler::DoSample() {
   if (!SignalHandler::Installed()) return;
@@ skipping 35 matching lines @@
 #endif  // USE_SIMULATOR
     SampleStack(state);
   }
   ResumeThread(profiled_thread);
 }
 
 #endif  // USE_SIGNALS
 
 
 } }  // namespace v8::internal