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      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/StackStats.h"
     34 #include "wtf/ThreadSpecific.h"
     35 #include "wtf/Threading.h"
     36 #include "wtf/WTFExport.h"
     37 #include "wtf/text/StringHash.h"
     38 
     39 namespace WTF {
     40 
     41 class AtomicStringTable;
     42 struct ICUConverterWrapper;
     43 
     44 typedef void (*AtomicStringTableDestructor)(AtomicStringTable*);
     45 
     46 class WTF_EXPORT WTFThreadData {
     47     WTF_MAKE_NONCOPYABLE(WTFThreadData);
     48 public:
     49     WTFThreadData();
     50     ~WTFThreadData();
     51 
     52     AtomicStringTable* atomicStringTable()
     53     {
     54         return m_atomicStringTable;
     55     }
     56 
     57     ICUConverterWrapper& cachedConverterICU() { return *m_cachedConverterICU; }
     58 
     59     void* m_apiData;
     60 
     61 private:
     62     AtomicStringTable* m_atomicStringTable;
     63     AtomicStringTableDestructor m_atomicStringTableDestructor;
     64     OwnPtr<ICUConverterWrapper> m_cachedConverterICU;
     65 
     66     static ThreadSpecific<WTFThreadData>* staticData;
     67     friend WTFThreadData& wtfThreadData();
     68     friend class AtomicStringTable;
     69 };
     70 
     71 inline WTFThreadData& wtfThreadData()
     72 {
     73     // WRT WebCore:
     74     //    WTFThreadData is used on main thread before it could possibly be used
     75     //    on secondary ones, so there is no need for synchronization here.
     76     // WRT JavaScriptCore:
     77     //    wtfThreadData() is initially called from initializeThreading(), ensuring
     78     //    this is initially called in a pthread_once locked context.
     79     if (!WTFThreadData::staticData)
     80         WTFThreadData::staticData = new ThreadSpecific<WTFThreadData>;
     81     return **WTFThreadData::staticData;
     82 }
     83 
     84 } // namespace WTF
     85 
     86 using WTF::WTFThreadData;
     87 using WTF::wtfThreadData;
     88 
     89 #endif // WTFThreadData_h
     90