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
eventNames()53 EventNames& eventNames() { return *m_eventNames; }
emptyString()54 StringImpl* emptyString() { return m_emptyString; }
atomicStringTable()55 HashSet<StringImpl*>& atomicStringTable() { return *m_atomicStringTable; }
threadTimers()56 ThreadTimers& threadTimers() { return *m_threadTimers; }
57
58 #if USE(ICU_UNICODE) || USE(GLIB_ICU_UNICODE_HYBRID)
cachedConverterICU()59 ICUConverterWrapper& cachedConverterICU() { return *m_cachedConverterICU; }
60 #endif
61
62 #if PLATFORM(MAC)
cachedConverterTEC()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
threadGlobalData()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