CPU profiler: make code events handling scalable.

src/platform-win32.cc

 // Copyright 2006-2008 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
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 int OS::ActivationFrameAlignment() {
 #ifdef _WIN64
   return 16;  // Windows 64-bit ABI requires the stack to be 16-byte aligned.
 #else
   return 8;  // Floating-point math runs faster with 8-byte alignment.
 #endif
 }
 
 
+void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) {
+  MemoryBarrier();
+  *ptr = value;
+}
+
+
 bool VirtualMemory::IsReserved() {
   return address_ != NULL;
 }
 
 
 VirtualMemory::VirtualMemory(size_t size) {
   address_ = VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_NOACCESS);
   size_ = size;
 }
 
@@ skipping 543 matching lines @@
 
   // Release the thread handles
   CloseHandle(data_->sampler_thread_);
   CloseHandle(data_->profiled_thread_);
 }
 
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal