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27 #ifndef WTFThreadData_h
28 #define WTFThreadData_h
30 #include <wtf/HashMap.h>
31 #include <wtf/HashSet.h>
32 #include <wtf/Noncopyable.h>
33 #include <wtf/StackBounds.h>
34 #include <wtf/text/StringHash.h>
36 // This was ENABLE(WORKERS) in WebCore, but this is not defined when compiling JSC.
37 // However this check was not correct anyway, re this comment:
38 // // FIXME: Workers are not necessarily the only feature that make per-thread global data necessary.
39 // // We need to check for e.g. database objects manipulating strings on secondary threads.
40 // Always enabling this is safe, and should be a better option until we can come up
41 // with a better define.
42 #define WTFTHREADDATA_MULTITHREADED 1
44 #if WTFTHREADDATA_MULTITHREADED
45 #include <wtf/ThreadSpecific.h>
46 #include <wtf/Threading.h>
50 // FIXME: This is a temporary layering violation while we move more string code to WTF.
53 typedef HashMap
<const char*, RefPtr
<StringImpl
>, PtrHash
<const char*> > LiteralIdentifierTable
;
55 class IdentifierTable
{
56 WTF_MAKE_FAST_ALLOCATED
;
60 std::pair
<HashSet
<StringImpl
*>::iterator
, bool> add(StringImpl
* value
);
61 template<typename U
, typename V
>
62 std::pair
<HashSet
<StringImpl
*>::iterator
, bool> add(U value
);
64 bool remove(StringImpl
* r
)
66 HashSet
<StringImpl
*>::iterator iter
= m_table
.find(r
);
67 if (iter
== m_table
.end())
73 LiteralIdentifierTable
& literalTable() { return m_literalTable
; }
76 HashSet
<StringImpl
*> m_table
;
77 LiteralIdentifierTable m_literalTable
;
85 class AtomicStringTable
;
87 typedef void (*AtomicStringTableDestructor
)(AtomicStringTable
*);
90 WTF_MAKE_NONCOPYABLE(WTFThreadData
);
95 AtomicStringTable
* atomicStringTable()
97 return m_atomicStringTable
;
101 JSC::IdentifierTable
* currentIdentifierTable()
103 return m_currentIdentifierTable
;
106 JSC::IdentifierTable
* setCurrentIdentifierTable(JSC::IdentifierTable
* identifierTable
)
108 JSC::IdentifierTable
* oldIdentifierTable
= m_currentIdentifierTable
;
109 m_currentIdentifierTable
= identifierTable
;
110 return oldIdentifierTable
;
113 void resetCurrentIdentifierTable()
115 m_currentIdentifierTable
= m_defaultIdentifierTable
;
118 const StackBounds
& stack() const
120 return m_stackBounds
;
125 AtomicStringTable
* m_atomicStringTable
;
126 AtomicStringTableDestructor m_atomicStringTableDestructor
;
129 JSC::IdentifierTable
* m_defaultIdentifierTable
;
130 JSC::IdentifierTable
* m_currentIdentifierTable
;
131 StackBounds m_stackBounds
;
134 #if WTFTHREADDATA_MULTITHREADED
135 static JS_EXPORTDATA ThreadSpecific
<WTFThreadData
>* staticData
;
137 static JS_EXPORTDATA WTFThreadData
* staticData
;
139 friend WTFThreadData
& wtfThreadData();
140 friend class AtomicStringTable
;
143 inline WTFThreadData
& wtfThreadData()
145 #if WTFTHREADDATA_MULTITHREADED
147 // WTFThreadData is used on main thread before it could possibly be used
148 // on secondary ones, so there is no need for synchronization here.
149 // WRT JavaScriptCore:
150 // wtfThreadData() is initially called from initializeThreading(), ensuring
151 // this is initially called in a pthread_once locked context.
152 if (!WTFThreadData::staticData
)
153 WTFThreadData::staticData
= new ThreadSpecific
<WTFThreadData
>;
154 return **WTFThreadData::staticData
;
156 if (!WTFThreadData::staticData
) {
157 WTFThreadData::staticData
= static_cast<WTFThreadData
*>(fastMalloc(sizeof(WTFThreadData
)));
158 // WTFThreadData constructor indirectly uses staticData, so we need to set up the memory before invoking it.
159 new (WTFThreadData::staticData
) WTFThreadData
;
161 return *WTFThreadData::staticData
;
167 using WTF::WTFThreadData
;
168 using WTF::wtfThreadData
;
170 #endif // WTFThreadData_h