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         void destroy(); // called on workers to clean up the ThreadGlobalData before the thread exits.

    53 

    54         EventNames& eventNames() { return *m_eventNames; }

    55         ThreadTimers& threadTimers() { return *m_threadTimers; }

    56 

    57 #if USE(ICU_UNICODE)

    58         ICUConverterWrapper& cachedConverterICU() { return *m_cachedConverterICU; }

    59 #endif

    60 

    61 #if PLATFORM(MAC)

    62         TECConverterWrapper& cachedConverterTEC() { return *m_cachedConverterTEC; }

    63 #endif

    64 

    65     private:

    66         EventNames* m_eventNames;

    67         ThreadTimers* m_threadTimers;

    68 

    69 #ifndef NDEBUG

    70         bool m_isMainThread;

    71 #endif

    72 

    73 #if USE(ICU_UNICODE)

    74         ICUConverterWrapper* m_cachedConverterICU;

    75 #endif

    76 

    77 #if PLATFORM(MAC)

    78         TECConverterWrapper* m_cachedConverterTEC;

    79 #endif

    80 

    81 #if ENABLE(WORKERS)

    82         static ThreadSpecific<ThreadGlobalData>* staticData;

    83 #else

    84         static ThreadGlobalData* staticData;

    85 #endif

    86         friend ThreadGlobalData& threadGlobalData();

    87     };

    88 

    89 inline ThreadGlobalData& threadGlobalData() 

    90 {

    91     // FIXME: Workers are not necessarily the only feature that make per-thread global data necessary.

    92     // We need to check for e.g. database objects manipulating strings on secondary threads.

    93 

    94 #if ENABLE(WORKERS)

    95     // ThreadGlobalData is used on main thread before it could possibly be used on secondary ones, so there is no need for synchronization here.

    96     if (!ThreadGlobalData::staticData)

    97         ThreadGlobalData::staticData = new ThreadSpecific<ThreadGlobalData>;

    98     return **ThreadGlobalData::staticData;

    99 #else

   100     if (!ThreadGlobalData::staticData) {

   101         ThreadGlobalData::staticData = static_cast<ThreadGlobalData*>(fastMalloc(sizeof(ThreadGlobalData)));

   102         // ThreadGlobalData constructor indirectly uses staticData, so we need to set up the memory before invoking it.

   103         new (ThreadGlobalData::staticData) ThreadGlobalData;

   104     }

   105     return *ThreadGlobalData::staticData;

   106 #endif

   107 }

   108     

   109 } // namespace WebCore

   110 

   111 #endif // ThreadGlobalData_h