Cheaper thread-safe atomic initialization of static references.

Source/platform/blob/BlobRegistry.cpp

 /*
  * Copyright (C) 2010 Google 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:
  *
  *     * 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
@@ skipping 87 matching lines @@
 
 static WebBlobRegistry* blobRegistry()
 {
     return Platform::current()->blobRegistry();
 }
 
 typedef HashMap<String, RefPtr<SecurityOrigin>> BlobURLOriginMap;
 static ThreadSpecific<BlobURLOriginMap>& originMap()
 {
     // We want to create the BlobOriginCache exactly once because it is shared by all the threads.
-    AtomicallyInitializedStatic(BlobOriginCache*, cache = new BlobOriginCache);
+    AtomicallyInitializedStaticReference(BlobOriginCache, cache, new BlobOriginCache);
     (void)cache; // BlobOriginCache's constructor does the interesting work.
 
-    AtomicallyInitializedStatic(ThreadSpecific<BlobURLOriginMap>*, map = new ThreadSpecific<BlobURLOriginMap>);
-    return *map;
+    AtomicallyInitializedStaticReference(ThreadSpecific<BlobURLOriginMap>, map, new ThreadSpecific<BlobURLOriginMap>);
+    return map;
 }
 
 static void saveToOriginMap(SecurityOrigin* origin, const KURL& url)
 {
     // If the blob URL contains null origin, as in the context with unique
     // security origin or file URL, save the mapping between url and origin so
     // that the origin can be retrived when doing security origin check.
     if (origin && BlobURL::getOrigin(url) == "null")
         originMap()->add(url.string(), origin);
 }
@@ skipping 169 matching lines @@
 }
 
 SecurityOrigin* BlobOriginCache::cachedOrigin(const KURL& url)
 {
     if (url.protocolIs("blob"))
         return originMap()->get(url.string());
     return 0;
 }
 
 } // namespace blink