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juce_ThreadLocalValue.h
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2017 - ROLI Ltd.
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23 namespace juce
24{
25
26//==============================================================================
46 template <typename Type>
47 class ThreadLocalValue
48{
49 public:
51 ThreadLocalValue() = default;
52
56 ~ThreadLocalValue()
57 {
58 for (auto* o = first.get(); o != nullptr;)
59 {
60 auto* next = o->next;
61 delete o;
62 o = next;
63 }
64 }
65
71 Type& operator*() const noexcept { return get(); }
72
78 operator Type*() const noexcept { return &get(); }
79
85 Type* operator->() const noexcept { return &get(); }
86
88 ThreadLocalValue& operator= (const Type& newValue) { get() = newValue; return *this; }
89
95 Type& get() const noexcept
96 {
97 auto threadId = Thread::getCurrentThreadId();
98 ObjectHolder* o = nullptr;
99
100 for (o = first.get(); o != nullptr; o = o->next)
101 if (o->threadId.get() == threadId)
102 return o->object;
103
104 for (o = first.get(); o != nullptr; o = o->next)
105 if (o->threadId.compareAndSetBool (threadId, nullptr))
106 break;
107
108 if (o != nullptr)
109 o->object = Type();
110 else
111 for (o = new ObjectHolder (threadId, first.get());
112 ! first.compareAndSetBool (o, o->next);
113 o->next = first.get());
114
115 return o->object;
116 }
117
121 void releaseCurrentThreadStorage()
122 {
123 auto threadId = Thread::getCurrentThreadId();
124
125 for (auto* o = first.get(); o != nullptr; o = o->next)
126 if (o->threadId.compareAndSetBool (nullptr, threadId))
127 return;
128 }
129
130 private:
131 //==============================================================================
132 struct ObjectHolder
133 {
134 ObjectHolder (Thread::ThreadID idToUse, ObjectHolder* n) : threadId (idToUse), next (n), object() {}
135
136 Atomic<Thread::ThreadID> threadId;
137 ObjectHolder* next;
138 Type object;
139
140 JUCE_DECLARE_NON_COPYABLE (ObjectHolder)
141 };
142
143 mutable Atomic<ObjectHolder*> first;
144
145 JUCE_DECLARE_NON_COPYABLE (ThreadLocalValue)
146};
147
148} // namespace juce
juce::ThreadLocalValue
Definition: juce_ThreadLocalValue.h:48
juce::ThreadLocalValue::operator*
Type & operator*() const noexcept
Definition: juce_ThreadLocalValue.h:71
juce::ThreadLocalValue::operator->
Type * operator->() const noexcept
Definition: juce_ThreadLocalValue.h:85
juce::ThreadLocalValue::releaseCurrentThreadStorage
void releaseCurrentThreadStorage()
Definition: juce_ThreadLocalValue.h:121
juce::ThreadLocalValue::get
Type & get() const noexcept
Definition: juce_ThreadLocalValue.h:95
juce::ThreadLocalValue::operator=
ThreadLocalValue & operator=(const Type &newValue)
Definition: juce_ThreadLocalValue.h:88
juce::ThreadLocalValue::~ThreadLocalValue
~ThreadLocalValue()
Definition: juce_ThreadLocalValue.h:56
juce::Thread::ThreadID
void * ThreadID
Definition: juce_Thread.h:304
juce::Thread::getCurrentThreadId
static ThreadID JUCE_CALLTYPE getCurrentThreadId()
juce::Atomic::get
Type get() const noexcept
Definition: juce_Atomic.h:64
juce::Atomic::compareAndSetBool
bool compareAndSetBool(Type newValue, Type valueToCompare) noexcept
Definition: juce_Atomic.h:96