Moving cpu profiling into its own thread.

src/platform.h

 // Copyright 2012 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 745 matching lines @@
   Isolate* isolate_;
   const int interval_;
   Atomic32 profiling_;
   Atomic32 active_;
   PlatformData* data_;  // Platform specific data.
   int samples_taken_;  // Counts stack samples taken.
   DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler);
 };
 
 
+// ----------------------------------------------------------------------------
+// CpuProfilerThread
+//
+
+class CpuProfilerThread : public Thread {
+ public:
+  static const int kCpuProfilerThreadStackSize = 64 * KB;
+
+  explicit CpuProfilerThread(Sampler* sampler);
+  virtual ~CpuProfilerThread();
+
+  virtual void Run() = 0;
+
+  void DoSample();
+
+  class PlatformData;
+  PlatformData* data() { return data_; }
+
+  PlatformData* platform_data() { return data_; }
+
+ private:
+  PlatformData* data_;  // Platform specific data.
+  Sampler* sampler_;
+};
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_