third_party/WebKit/Source/wtf/WTFThreadData.h

   1 /*
   2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  *
  25  */
  26
  27 #ifndef WTFThreadData_h
  28 #define WTFThreadData_h
  29
  30 #include "wtf/HashMap.h"
  31 #include "wtf/HashSet.h"
  32 #include "wtf/Noncopyable.h"
  33 #include "wtf/ThreadSpecific.h"
  34 #include "wtf/Threading.h"
  35 #include "wtf/WTFExport.h"
  36 #include "wtf/text/StringHash.h"
  37
  38 namespace WTF {
  39
  40 class AtomicStringTable;
  41 struct ICUConverterWrapper;
  42
  43 typedef void (*AtomicStringTableDestructor)(AtomicStringTable*);
  44
  45 class WTF_EXPORT WTFThreadData {
  46     WTF_MAKE_NONCOPYABLE(WTFThreadData);
  47 public:
  48     WTFThreadData();
  49     ~WTFThreadData();
  50
  51     AtomicStringTable* atomicStringTable()
  52     {
  53         return m_atomicStringTable;
  54     }
  55
  56     ICUConverterWrapper& cachedConverterICU() { return *m_cachedConverterICU; }
  57
  58 private:
  59     AtomicStringTable* m_atomicStringTable;
  60     AtomicStringTableDestructor m_atomicStringTableDestructor;
  61     OwnPtr<ICUConverterWrapper> m_cachedConverterICU;
  62
  63     static ThreadSpecific<WTFThreadData>* staticData;
  64     friend WTFThreadData& wtfThreadData();
  65     friend class AtomicStringTable;
  66 };
  67
  68 inline WTFThreadData& wtfThreadData()
  69 {
  70     // WRT WebCore:
  71     //    WTFThreadData is used on main thread before it could possibly be used
  72     //    on secondary ones, so there is no need for synchronization here.
  73     // WRT JavaScriptCore:
  74     //    wtfThreadData() is initially called from initializeThreading(), ensuring
  75     //    this is initially called in a pthread_once locked context.
  76     if (!WTFThreadData::staticData)
  77         WTFThreadData::staticData = new ThreadSpecific<WTFThreadData>;
  78     return **WTFThreadData::staticData;
  79 }
  80
  81 } // namespace WTF
  82
  83 using WTF::WTFThreadData;
  84 using WTF::wtfThreadData;
  85
  86 #endif // WTFThreadData_h