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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 ThreadGlobalData_h
     28 #define ThreadGlobalData_h
     29 
     30 #include <wtf/HashMap.h>
     31 #include <wtf/HashSet.h>
     32 #include <wtf/Noncopyable.h>
     33 #include <wtf/text/StringHash.h>
     34 
     35 #if ENABLE(WORKERS)
     36 #include <wtf/ThreadSpecific.h>
     37 #include <wtf/Threading.h>
     38 using WTF::ThreadSpecific;
     39 #endif
     40 
     41 namespace WebCore {
     42 
     43     class EventNames;
     44     struct ICUConverterWrapper;
     45     struct TECConverterWrapper;
     46     class ThreadTimers;
     47 
     48     class ThreadGlobalData {
     49         WTF_MAKE_NONCOPYABLE(ThreadGlobalData);
     50     public:
     51         ThreadGlobalData();
     52         ~ThreadGlobalData();
     53         void destroy(); // called on workers to clean up the ThreadGlobalData before the thread exits.
     54 
     55         EventNames& eventNames() { return *m_eventNames; }
     56         ThreadTimers& threadTimers() { return *m_threadTimers; }
     57 
     58 #if USE(ICU_UNICODE)
     59         ICUConverterWrapper& cachedConverterICU() { return *m_cachedConverterICU; }
     60 #endif
     61 
     62 #if PLATFORM(MAC)
     63         TECConverterWrapper& cachedConverterTEC() { return *m_cachedConverterTEC; }
     64 #endif
     65 
     66     private:
     67         EventNames* m_eventNames;
     68         ThreadTimers* m_threadTimers;
     69 
     70 #ifndef NDEBUG
     71         bool m_isMainThread;
     72 #endif
     73 
     74 #if USE(ICU_UNICODE)
     75         ICUConverterWrapper* m_cachedConverterICU;
     76 #endif
     77 
     78 #if PLATFORM(MAC)
     79         TECConverterWrapper* m_cachedConverterTEC;
     80 #endif
     81 
     82 #if ENABLE(WORKERS)
     83         static ThreadSpecific<ThreadGlobalData>* staticData;
     84 #else
     85         static ThreadGlobalData* staticData;
     86 #endif
     87         friend ThreadGlobalData& threadGlobalData();
     88     };
     89 
     90 inline ThreadGlobalData& threadGlobalData()
     91 {
     92     // FIXME: Workers are not necessarily the only feature that make per-thread global data necessary.
     93     // We need to check for e.g. database objects manipulating strings on secondary threads.
     94 
     95 #if ENABLE(WORKERS)
     96     // ThreadGlobalData is used on main thread before it could possibly be used on secondary ones, so there is no need for synchronization here.
     97     if (!ThreadGlobalData::staticData)
     98         ThreadGlobalData::staticData = new ThreadSpecific<ThreadGlobalData>;
     99     return **ThreadGlobalData::staticData;
    100 #else
    101     if (!ThreadGlobalData::staticData) {
    102         ThreadGlobalData::staticData = static_cast<ThreadGlobalData*>(fastMalloc(sizeof(ThreadGlobalData)));
    103         // ThreadGlobalData constructor indirectly uses staticData, so we need to set up the memory before invoking it.
    104         new (ThreadGlobalData::staticData) ThreadGlobalData;
    105     }
    106     return *ThreadGlobalData::staticData;
    107 #endif
    108 }
    109 
    110 } // namespace WebCore
    111 
    112 #endif // ThreadGlobalData_h
    113