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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/OwnPtr.h"
     34 #include "wtf/PassOwnPtr.h"
     35 #include "wtf/ThreadSpecific.h"
     36 #include "wtf/Threading.h"
     37 #include "wtf/text/StringHash.h"
     38 
     39 using WTF::ThreadSpecific;
     40 
     41 namespace WebCore {
     42 
     43     class EventNames;
     44     class ThreadLocalInspectorCounters;
     45     class ThreadTimers;
     46 
     47     struct TECConverterWrapper;
     48 
     49     class ThreadGlobalData {
     50         WTF_MAKE_NONCOPYABLE(ThreadGlobalData);
     51     public:
     52         ThreadGlobalData();
     53         ~ThreadGlobalData();
     54         void destroy(); // called on workers to clean up the ThreadGlobalData before the thread exits.
     55 
     56         EventNames& eventNames() { return *m_eventNames; }
     57         ThreadTimers& threadTimers() { return *m_threadTimers; }
     58 
     59         ThreadLocalInspectorCounters& inspectorCounters() { return *m_inspectorCounters; }
     60 
     61     private:
     62         OwnPtr<EventNames> m_eventNames;
     63         OwnPtr<ThreadTimers> m_threadTimers;
     64 
     65 #ifndef NDEBUG
     66         bool m_isMainThread;
     67 #endif
     68 
     69         OwnPtr<ThreadLocalInspectorCounters> m_inspectorCounters;
     70 
     71         static ThreadSpecific<ThreadGlobalData>* staticData;
     72         friend ThreadGlobalData& threadGlobalData();
     73     };
     74 
     75 inline ThreadGlobalData& threadGlobalData()
     76 {
     77     // FIXME: Workers are not necessarily the only feature that make per-thread global data necessary.
     78     // We need to check for e.g. database objects manipulating strings on secondary threads.
     79 
     80     // ThreadGlobalData is used on main thread before it could possibly be used on secondary ones, so there is no need for synchronization here.
     81     if (!ThreadGlobalData::staticData)
     82         ThreadGlobalData::staticData = new ThreadSpecific<ThreadGlobalData>;
     83     return **ThreadGlobalData::staticData;
     84 }
     85 
     86 } // namespace WebCore
     87 
     88 #endif // ThreadGlobalData_h
     89