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juce_Atomic.h
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2022 - Raw Material Software Limited
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#ifndef DOXYGEN
27 namespace AtomicHelpers
28 {
29 template <typename T> struct DiffTypeHelper { using Type = T; };
30 template <typename T> struct DiffTypeHelper<T*> { using Type = std::ptrdiff_t; };
31 }
32#endif
33
34//==============================================================================
40 template <typename Type>
41 struct Atomic final
42{
43 using DiffType = typename AtomicHelpers::DiffTypeHelper<Type>::Type;
44
46 Atomic() noexcept : value (Type()) {}
47
49 Atomic (Type initialValue) noexcept : value (initialValue) {}
50
52 Atomic (const Atomic& other) noexcept : value (other.get()) {}
53
55 ~Atomic() noexcept
56 {
57 #if __cpp_lib_atomic_is_always_lock_free
58 static_assert (std::atomic<Type>::is_always_lock_free,
59 "This class can only be used for lock-free types");
60 #endif
61 }
62
64 Type get() const noexcept { return value.load(); }
65
67 void set (Type newValue) noexcept { value = newValue; }
68
70 Type exchange (Type newValue) noexcept { return value.exchange (newValue); }
71
96 bool compareAndSetBool (Type newValue, Type valueToCompare) noexcept
97 {
98 return value.compare_exchange_strong (valueToCompare, newValue);
99 }
100
102 Atomic<Type>& operator= (const Atomic& other) noexcept
103 {
104 value = other.value.load();
105 return *this;
106 }
107
109 Atomic<Type>& operator= (Type newValue) noexcept
110 {
111 value = newValue;
112 return *this;
113 }
114
116 Type operator+= (DiffType amountToAdd) noexcept { return value += amountToAdd; }
117
119 Type operator-= (DiffType amountToSubtract) noexcept { return value -= amountToSubtract; }
120
122 Type operator++() noexcept { return ++value; }
123
125 Type operator--() noexcept { return --value; }
126
132 void memoryBarrier() noexcept { atomic_thread_fence (std::memory_order_seq_cst); }
133
135 std::atomic<Type> value;
136
137 //==============================================================================
138 #ifndef DOXYGEN
139 [[deprecated ("This method has been deprecated as there is no equivalent method in "
140 "std::atomic. Use compareAndSetBool instead.")]]
141 Type compareAndSetValue (Type, Type) noexcept;
142 #endif
143};
144
145} // namespace juce
juce::Atomic
Definition juce_Atomic.h:42
juce::Atomic::get
Type get() const noexcept
Definition juce_Atomic.h:64
juce::Atomic::exchange
Type exchange(Type newValue) noexcept
Definition juce_Atomic.h:70
juce::Atomic::Atomic
Atomic(Type initialValue) noexcept
Definition juce_Atomic.h:49
juce::Atomic::set
void set(Type newValue) noexcept
Definition juce_Atomic.h:67
juce::Atomic::Atomic
Atomic() noexcept
Definition juce_Atomic.h:46
juce::Atomic::value
std::atomic< Type > value
Definition juce_Atomic.h:135
juce::Atomic::compareAndSetBool
bool compareAndSetBool(Type newValue, Type valueToCompare) noexcept
Definition juce_Atomic.h:96
juce::Atomic::operator=
Atomic< Type > & operator=(const Atomic &other) noexcept
Definition juce_Atomic.h:102
juce::Atomic::operator--
Type operator--() noexcept
Definition juce_Atomic.h:125
juce::Atomic::operator-=
Type operator-=(DiffType amountToSubtract) noexcept
Definition juce_Atomic.h:119
juce::Atomic::operator+=
Type operator+=(DiffType amountToAdd) noexcept
Definition juce_Atomic.h:116
juce::Atomic::~Atomic
~Atomic() noexcept
Definition juce_Atomic.h:55
juce::Atomic::memoryBarrier
void memoryBarrier() noexcept
Definition juce_Atomic.h:132
juce::Atomic::operator++
Type operator++() noexcept
Definition juce_Atomic.h:122
juce::Atomic::Atomic
Atomic(const Atomic &other) noexcept
Definition juce_Atomic.h:52