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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 "StringHash.h"
     31 #include <wtf/HashMap.h>
     32 #include <wtf/HashSet.h>
     33 #include <wtf/Noncopyable.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 : public Noncopyable {
     49     public:
     50         ThreadGlobalData();
     51         ~ThreadGlobalData();
     52 
     53         EventNames& eventNames() { return *m_eventNames; }
     54         StringImpl* emptyString() { return m_emptyString; }
     55         HashSet<StringImpl*>& atomicStringTable() { return *m_atomicStringTable; }
     56         ThreadTimers& threadTimers() { return *m_threadTimers; }
     57 
     58 #if USE(ICU_UNICODE) || USE(GLIB_ICU_UNICODE_HYBRID)
     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         StringImpl* m_emptyString;
     68         HashSet<StringImpl*>* m_atomicStringTable;
     69         EventNames* m_eventNames;
     70         ThreadTimers* m_threadTimers;
     71 
     72 #ifndef NDEBUG
     73         bool m_isMainThread;
     74 #endif
     75 
     76 #if USE(ICU_UNICODE) || USE(GLIB_ICU_UNICODE_HYBRID)
     77         ICUConverterWrapper* m_cachedConverterICU;
     78 #endif
     79 
     80 #if PLATFORM(MAC)
     81         TECConverterWrapper* m_cachedConverterTEC;
     82 #endif
     83 
     84 #if ENABLE(WORKERS)
     85         static ThreadSpecific<ThreadGlobalData>* staticData;
     86 #else
     87         static ThreadGlobalData* staticData;
     88 #endif
     89         friend ThreadGlobalData& threadGlobalData();
     90     };
     91 
     92 inline ThreadGlobalData& threadGlobalData()
     93 {
     94     // FIXME: Workers are not necessarily the only feature that make per-thread global data necessary.
     95     // We need to check for e.g. database objects manipulating strings on secondary threads.
     96 
     97 #if ENABLE(WORKERS)
     98     // ThreadGlobalData is used on main thread before it could possibly be used on secondary ones, so there is no need for synchronization here.
     99     if (!ThreadGlobalData::staticData)
    100         ThreadGlobalData::staticData = new ThreadSpecific<ThreadGlobalData>;
    101     return **ThreadGlobalData::staticData;
    102 #else
    103     if (!ThreadGlobalData::staticData) {
    104         ThreadGlobalData::staticData = static_cast<ThreadGlobalData*>(fastMalloc(sizeof(ThreadGlobalData)));
    105         // ThreadGlobalData constructor indirectly uses staticData, so we need to set up the memory before invoking it.
    106         new (ThreadGlobalData::staticData) ThreadGlobalData;
    107     }
    108     return *ThreadGlobalData::staticData;
    109 #endif
    110 }
    111 
    112 } // namespace WebCore
    113 
    114 #endif // ThreadGlobalData_h
    115