Avoid checking for WTFThreadData::staticData in wtfThreadData()

third_party/WebKit/Source/wtf/WTFThreadData.cpp

 /*
  * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 23 matching lines @@
 
 ThreadSpecific<WTFThreadData>* WTFThreadData::staticData;
 
 WTFThreadData::WTFThreadData()
     : m_atomicStringTable(new AtomicStringTable),
       m_cachedConverterICU(new ICUConverterWrapper),
       m_threadId(internal::currentThreadSyscall()) {}
 
 WTFThreadData::~WTFThreadData() {}
 
+void WTFThreadData::initialize() {
+  // WTFThreadData is used on main thread before it could possibly be used

[esprehn, 2017/02/02 23:24:51]

You can remove this comment now. It's per thread and we don't care about which
one

[Charlie Harrison, 2017/02/02 23:35:38]

Done.

+  // on secondary ones, so there is no need for synchronization here.
+  DCHECK(!WTFThreadData::staticData);
+  WTFThreadData::staticData = new ThreadSpecific<WTFThreadData>;
+  wtfThreadData();
+}
+
 #if OS(WIN) && COMPILER(MSVC)
 size_t WTFThreadData::threadStackSize() {
   // Needed to bootstrap WTFThreadData on Windows, because this value is needed
   // before the main thread data is fully initialized.
   if (!WTFThreadData::staticData->isSet())
     return internal::threadStackSize();
 
   WTFThreadData& data = wtfThreadData();
   if (!data.m_threadStackSize)
     data.m_threadStackSize = internal::threadStackSize();
   return data.m_threadStackSize;
 }
 #endif
 
 }  // namespace WTF