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1 // -*- C++ -*- header.
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2
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145
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3 // Copyright (C) 2008-2020 Free Software Foundation, Inc.
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111
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4 //
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5 // This file is part of the GNU ISO C++ Library. This library is free
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6 // software; you can redistribute it and/or modify it under the
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7 // terms of the GNU General Public License as published by the
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8 // Free Software Foundation; either version 3, or (at your option)
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9 // any later version.
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10
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11 // This library is distributed in the hope that it will be useful,
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12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 // GNU General Public License for more details.
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15
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16 // Under Section 7 of GPL version 3, you are granted additional
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17 // permissions described in the GCC Runtime Library Exception, version
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18 // 3.1, as published by the Free Software Foundation.
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19
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20 // You should have received a copy of the GNU General Public License and
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21 // a copy of the GCC Runtime Library Exception along with this program;
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22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 // <http://www.gnu.org/licenses/>.
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24
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25 /** @file include/atomic
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26 * This is a Standard C++ Library header.
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27 */
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28
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29 // Based on "C++ Atomic Types and Operations" by Hans Boehm and Lawrence Crowl.
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30 // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html
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31
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32 #ifndef _GLIBCXX_ATOMIC
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33 #define _GLIBCXX_ATOMIC 1
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34
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35 #pragma GCC system_header
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36
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37 #if __cplusplus < 201103L
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38 # include <bits/c++0x_warning.h>
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39 #else
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40
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41 #include <bits/atomic_base.h>
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42
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43 namespace std _GLIBCXX_VISIBILITY(default)
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44 {
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45 _GLIBCXX_BEGIN_NAMESPACE_VERSION
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46
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47 /**
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48 * @addtogroup atomics
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49 * @{
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50 */
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51
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131
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52 #if __cplusplus >= 201703L
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111
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53 # define __cpp_lib_atomic_is_always_lock_free 201603
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54 #endif
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55
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56 template<typename _Tp>
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57 struct atomic;
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58
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59 /// atomic<bool>
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60 // NB: No operators or fetch-operations for this type.
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61 template<>
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62 struct atomic<bool>
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63 {
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131
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64 using value_type = bool;
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65
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66 private:
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67 __atomic_base<bool> _M_base;
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68
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69 public:
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70 atomic() noexcept = default;
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71 ~atomic() noexcept = default;
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72 atomic(const atomic&) = delete;
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73 atomic& operator=(const atomic&) = delete;
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74 atomic& operator=(const atomic&) volatile = delete;
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75
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76 constexpr atomic(bool __i) noexcept : _M_base(__i) { }
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77
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78 bool
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79 operator=(bool __i) noexcept
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80 { return _M_base.operator=(__i); }
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81
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82 bool
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83 operator=(bool __i) volatile noexcept
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84 { return _M_base.operator=(__i); }
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85
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86 operator bool() const noexcept
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87 { return _M_base.load(); }
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88
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89 operator bool() const volatile noexcept
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90 { return _M_base.load(); }
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91
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92 bool
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93 is_lock_free() const noexcept { return _M_base.is_lock_free(); }
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94
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95 bool
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96 is_lock_free() const volatile noexcept { return _M_base.is_lock_free(); }
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97
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98 #if __cplusplus >= 201703L
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99 static constexpr bool is_always_lock_free = ATOMIC_BOOL_LOCK_FREE == 2;
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100 #endif
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101
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102 void
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103 store(bool __i, memory_order __m = memory_order_seq_cst) noexcept
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104 { _M_base.store(__i, __m); }
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105
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106 void
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107 store(bool __i, memory_order __m = memory_order_seq_cst) volatile noexcept
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108 { _M_base.store(__i, __m); }
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109
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110 bool
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111 load(memory_order __m = memory_order_seq_cst) const noexcept
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112 { return _M_base.load(__m); }
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113
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114 bool
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115 load(memory_order __m = memory_order_seq_cst) const volatile noexcept
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116 { return _M_base.load(__m); }
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117
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118 bool
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119 exchange(bool __i, memory_order __m = memory_order_seq_cst) noexcept
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120 { return _M_base.exchange(__i, __m); }
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121
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122 bool
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123 exchange(bool __i,
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124 memory_order __m = memory_order_seq_cst) volatile noexcept
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125 { return _M_base.exchange(__i, __m); }
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126
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127 bool
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128 compare_exchange_weak(bool& __i1, bool __i2, memory_order __m1,
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129 memory_order __m2) noexcept
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130 { return _M_base.compare_exchange_weak(__i1, __i2, __m1, __m2); }
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131
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132 bool
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133 compare_exchange_weak(bool& __i1, bool __i2, memory_order __m1,
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134 memory_order __m2) volatile noexcept
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135 { return _M_base.compare_exchange_weak(__i1, __i2, __m1, __m2); }
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136
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137 bool
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138 compare_exchange_weak(bool& __i1, bool __i2,
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139 memory_order __m = memory_order_seq_cst) noexcept
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140 { return _M_base.compare_exchange_weak(__i1, __i2, __m); }
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141
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142 bool
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143 compare_exchange_weak(bool& __i1, bool __i2,
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144 memory_order __m = memory_order_seq_cst) volatile noexcept
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145 { return _M_base.compare_exchange_weak(__i1, __i2, __m); }
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146
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147 bool
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148 compare_exchange_strong(bool& __i1, bool __i2, memory_order __m1,
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149 memory_order __m2) noexcept
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150 { return _M_base.compare_exchange_strong(__i1, __i2, __m1, __m2); }
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151
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152 bool
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153 compare_exchange_strong(bool& __i1, bool __i2, memory_order __m1,
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154 memory_order __m2) volatile noexcept
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155 { return _M_base.compare_exchange_strong(__i1, __i2, __m1, __m2); }
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156
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157 bool
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158 compare_exchange_strong(bool& __i1, bool __i2,
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159 memory_order __m = memory_order_seq_cst) noexcept
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160 { return _M_base.compare_exchange_strong(__i1, __i2, __m); }
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161
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162 bool
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163 compare_exchange_strong(bool& __i1, bool __i2,
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164 memory_order __m = memory_order_seq_cst) volatile noexcept
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165 { return _M_base.compare_exchange_strong(__i1, __i2, __m); }
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166 };
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167
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168 #if __cplusplus <= 201703L
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169 # define _GLIBCXX20_INIT(I)
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170 #else
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171 # define _GLIBCXX20_INIT(I) = I
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172 #endif
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111
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173
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174 /**
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175 * @brief Generic atomic type, primary class template.
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176 *
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177 * @tparam _Tp Type to be made atomic, must be trivially copyable.
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111
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178 */
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179 template<typename _Tp>
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180 struct atomic
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181 {
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131
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182 using value_type = _Tp;
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183
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184 private:
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185 // Align 1/2/4/8/16-byte types to at least their size.
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186 static constexpr int _S_min_alignment
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187 = (sizeof(_Tp) & (sizeof(_Tp) - 1)) || sizeof(_Tp) > 16
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188 ? 0 : sizeof(_Tp);
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189
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190 static constexpr int _S_alignment
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191 = _S_min_alignment > alignof(_Tp) ? _S_min_alignment : alignof(_Tp);
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192
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193 alignas(_S_alignment) _Tp _M_i _GLIBCXX20_INIT(_Tp());
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111
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194
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195 static_assert(__is_trivially_copyable(_Tp),
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196 "std::atomic requires a trivially copyable type");
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197
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198 static_assert(sizeof(_Tp) > 0,
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199 "Incomplete or zero-sized types are not supported");
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200
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201 public:
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202 atomic() = default;
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203 ~atomic() noexcept = default;
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204 atomic(const atomic&) = delete;
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205 atomic& operator=(const atomic&) = delete;
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206 atomic& operator=(const atomic&) volatile = delete;
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207
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208 constexpr atomic(_Tp __i) noexcept : _M_i(__i) { }
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209
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210 operator _Tp() const noexcept
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211 { return load(); }
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212
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213 operator _Tp() const volatile noexcept
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214 { return load(); }
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215
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216 _Tp
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217 operator=(_Tp __i) noexcept
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218 { store(__i); return __i; }
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219
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220 _Tp
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221 operator=(_Tp __i) volatile noexcept
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222 { store(__i); return __i; }
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223
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224 bool
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225 is_lock_free() const noexcept
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226 {
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227 // Produce a fake, minimally aligned pointer.
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228 return __atomic_is_lock_free(sizeof(_M_i),
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229 reinterpret_cast<void *>(-_S_alignment));
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230 }
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231
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232 bool
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233 is_lock_free() const volatile noexcept
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234 {
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235 // Produce a fake, minimally aligned pointer.
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236 return __atomic_is_lock_free(sizeof(_M_i),
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237 reinterpret_cast<void *>(-_S_alignment));
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238 }
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239
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240 #if __cplusplus >= 201703L
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241 static constexpr bool is_always_lock_free
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242 = __atomic_always_lock_free(sizeof(_M_i), 0);
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243 #endif
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244
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245 void
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246 store(_Tp __i, memory_order __m = memory_order_seq_cst) noexcept
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145
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247 { __atomic_store(std::__addressof(_M_i), std::__addressof(__i), int(__m)); }
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111
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248
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249 void
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250 store(_Tp __i, memory_order __m = memory_order_seq_cst) volatile noexcept
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145
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251 { __atomic_store(std::__addressof(_M_i), std::__addressof(__i), int(__m)); }
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111
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252
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253 _Tp
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254 load(memory_order __m = memory_order_seq_cst) const noexcept
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255 {
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256 alignas(_Tp) unsigned char __buf[sizeof(_Tp)];
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257 _Tp* __ptr = reinterpret_cast<_Tp*>(__buf);
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258 __atomic_load(std::__addressof(_M_i), __ptr, int(__m));
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259 return *__ptr;
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260 }
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261
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262 _Tp
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263 load(memory_order __m = memory_order_seq_cst) const volatile noexcept
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264 {
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265 alignas(_Tp) unsigned char __buf[sizeof(_Tp)];
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266 _Tp* __ptr = reinterpret_cast<_Tp*>(__buf);
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267 __atomic_load(std::__addressof(_M_i), __ptr, int(__m));
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268 return *__ptr;
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269 }
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270
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271 _Tp
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272 exchange(_Tp __i, memory_order __m = memory_order_seq_cst) noexcept
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273 {
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274 alignas(_Tp) unsigned char __buf[sizeof(_Tp)];
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275 _Tp* __ptr = reinterpret_cast<_Tp*>(__buf);
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276 __atomic_exchange(std::__addressof(_M_i), std::__addressof(__i),
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277 __ptr, int(__m));
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278 return *__ptr;
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279 }
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280
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281 _Tp
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282 exchange(_Tp __i,
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283 memory_order __m = memory_order_seq_cst) volatile noexcept
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284 {
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285 alignas(_Tp) unsigned char __buf[sizeof(_Tp)];
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286 _Tp* __ptr = reinterpret_cast<_Tp*>(__buf);
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287 __atomic_exchange(std::__addressof(_M_i), std::__addressof(__i),
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288 __ptr, int(__m));
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289 return *__ptr;
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290 }
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291
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292 bool
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293 compare_exchange_weak(_Tp& __e, _Tp __i, memory_order __s,
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294 memory_order __f) noexcept
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295 {
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296 return __atomic_compare_exchange(std::__addressof(_M_i),
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297 std::__addressof(__e),
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298 std::__addressof(__i),
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299 true, int(__s), int(__f));
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111
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300 }
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301
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302 bool
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303 compare_exchange_weak(_Tp& __e, _Tp __i, memory_order __s,
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304 memory_order __f) volatile noexcept
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305 {
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306 return __atomic_compare_exchange(std::__addressof(_M_i),
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307 std::__addressof(__e),
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308 std::__addressof(__i),
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309 true, int(__s), int(__f));
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310 }
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311
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312 bool
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313 compare_exchange_weak(_Tp& __e, _Tp __i,
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314 memory_order __m = memory_order_seq_cst) noexcept
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315 { return compare_exchange_weak(__e, __i, __m,
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316 __cmpexch_failure_order(__m)); }
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317
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318 bool
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319 compare_exchange_weak(_Tp& __e, _Tp __i,
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320 memory_order __m = memory_order_seq_cst) volatile noexcept
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321 { return compare_exchange_weak(__e, __i, __m,
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322 __cmpexch_failure_order(__m)); }
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323
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324 bool
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325 compare_exchange_strong(_Tp& __e, _Tp __i, memory_order __s,
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326 memory_order __f) noexcept
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327 {
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328 return __atomic_compare_exchange(std::__addressof(_M_i),
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329 std::__addressof(__e),
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330 std::__addressof(__i),
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331 false, int(__s), int(__f));
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332 }
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333
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334 bool
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335 compare_exchange_strong(_Tp& __e, _Tp __i, memory_order __s,
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336 memory_order __f) volatile noexcept
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337 {
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338 return __atomic_compare_exchange(std::__addressof(_M_i),
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339 std::__addressof(__e),
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340 std::__addressof(__i),
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145
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341 false, int(__s), int(__f));
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111
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342 }
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343
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344 bool
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345 compare_exchange_strong(_Tp& __e, _Tp __i,
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346 memory_order __m = memory_order_seq_cst) noexcept
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347 { return compare_exchange_strong(__e, __i, __m,
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348 __cmpexch_failure_order(__m)); }
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349
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350 bool
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351 compare_exchange_strong(_Tp& __e, _Tp __i,
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352 memory_order __m = memory_order_seq_cst) volatile noexcept
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353 { return compare_exchange_strong(__e, __i, __m,
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354 __cmpexch_failure_order(__m)); }
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355 };
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145
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356 #undef _GLIBCXX20_INIT
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111
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357
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358 /// Partial specialization for pointer types.
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359 template<typename _Tp>
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360 struct atomic<_Tp*>
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361 {
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131
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362 using value_type = _Tp*;
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363 using difference_type = ptrdiff_t;
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364
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111
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365 typedef _Tp* __pointer_type;
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366 typedef __atomic_base<_Tp*> __base_type;
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367 __base_type _M_b;
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368
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369 atomic() noexcept = default;
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370 ~atomic() noexcept = default;
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371 atomic(const atomic&) = delete;
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372 atomic& operator=(const atomic&) = delete;
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373 atomic& operator=(const atomic&) volatile = delete;
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374
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375 constexpr atomic(__pointer_type __p) noexcept : _M_b(__p) { }
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376
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377 operator __pointer_type() const noexcept
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378 { return __pointer_type(_M_b); }
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379
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380 operator __pointer_type() const volatile noexcept
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381 { return __pointer_type(_M_b); }
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382
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383 __pointer_type
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384 operator=(__pointer_type __p) noexcept
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385 { return _M_b.operator=(__p); }
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386
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387 __pointer_type
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388 operator=(__pointer_type __p) volatile noexcept
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389 { return _M_b.operator=(__p); }
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390
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391 __pointer_type
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392 operator++(int) noexcept
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131
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393 {
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394 #if __cplusplus >= 201703L
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395 static_assert( is_object<_Tp>::value, "pointer to object type" );
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396 #endif
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397 return _M_b++;
|
|
|
398 }
|
|
111
|
399
|
|
|
400 __pointer_type
|
|
|
401 operator++(int) volatile noexcept
|
|
131
|
402 {
|
|
|
403 #if __cplusplus >= 201703L
|
|
|
404 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
405 #endif
|
|
|
406 return _M_b++;
|
|
|
407 }
|
|
111
|
408
|
|
|
409 __pointer_type
|
|
|
410 operator--(int) noexcept
|
|
131
|
411 {
|
|
|
412 #if __cplusplus >= 201703L
|
|
|
413 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
414 #endif
|
|
|
415 return _M_b--;
|
|
|
416 }
|
|
111
|
417
|
|
|
418 __pointer_type
|
|
|
419 operator--(int) volatile noexcept
|
|
131
|
420 {
|
|
|
421 #if __cplusplus >= 201703L
|
|
|
422 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
423 #endif
|
|
|
424 return _M_b--;
|
|
|
425 }
|
|
111
|
426
|
|
|
427 __pointer_type
|
|
|
428 operator++() noexcept
|
|
131
|
429 {
|
|
|
430 #if __cplusplus >= 201703L
|
|
|
431 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
432 #endif
|
|
|
433 return ++_M_b;
|
|
|
434 }
|
|
111
|
435
|
|
|
436 __pointer_type
|
|
|
437 operator++() volatile noexcept
|
|
131
|
438 {
|
|
|
439 #if __cplusplus >= 201703L
|
|
|
440 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
441 #endif
|
|
|
442 return ++_M_b;
|
|
|
443 }
|
|
111
|
444
|
|
|
445 __pointer_type
|
|
|
446 operator--() noexcept
|
|
131
|
447 {
|
|
|
448 #if __cplusplus >= 201703L
|
|
|
449 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
450 #endif
|
|
|
451 return --_M_b;
|
|
|
452 }
|
|
111
|
453
|
|
|
454 __pointer_type
|
|
|
455 operator--() volatile noexcept
|
|
131
|
456 {
|
|
|
457 #if __cplusplus >= 201703L
|
|
|
458 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
459 #endif
|
|
|
460 return --_M_b;
|
|
|
461 }
|
|
111
|
462
|
|
|
463 __pointer_type
|
|
|
464 operator+=(ptrdiff_t __d) noexcept
|
|
131
|
465 {
|
|
|
466 #if __cplusplus >= 201703L
|
|
|
467 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
468 #endif
|
|
|
469 return _M_b.operator+=(__d);
|
|
|
470 }
|
|
111
|
471
|
|
|
472 __pointer_type
|
|
|
473 operator+=(ptrdiff_t __d) volatile noexcept
|
|
131
|
474 {
|
|
|
475 #if __cplusplus >= 201703L
|
|
|
476 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
477 #endif
|
|
|
478 return _M_b.operator+=(__d);
|
|
|
479 }
|
|
111
|
480
|
|
|
481 __pointer_type
|
|
|
482 operator-=(ptrdiff_t __d) noexcept
|
|
131
|
483 {
|
|
|
484 #if __cplusplus >= 201703L
|
|
|
485 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
486 #endif
|
|
|
487 return _M_b.operator-=(__d);
|
|
|
488 }
|
|
111
|
489
|
|
|
490 __pointer_type
|
|
|
491 operator-=(ptrdiff_t __d) volatile noexcept
|
|
131
|
492 {
|
|
|
493 #if __cplusplus >= 201703L
|
|
|
494 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
495 #endif
|
|
|
496 return _M_b.operator-=(__d);
|
|
|
497 }
|
|
111
|
498
|
|
|
499 bool
|
|
|
500 is_lock_free() const noexcept
|
|
|
501 { return _M_b.is_lock_free(); }
|
|
|
502
|
|
|
503 bool
|
|
|
504 is_lock_free() const volatile noexcept
|
|
|
505 { return _M_b.is_lock_free(); }
|
|
|
506
|
|
131
|
507 #if __cplusplus >= 201703L
|
|
111
|
508 static constexpr bool is_always_lock_free = ATOMIC_POINTER_LOCK_FREE == 2;
|
|
|
509 #endif
|
|
|
510
|
|
|
511 void
|
|
|
512 store(__pointer_type __p,
|
|
|
513 memory_order __m = memory_order_seq_cst) noexcept
|
|
|
514 { return _M_b.store(__p, __m); }
|
|
|
515
|
|
|
516 void
|
|
|
517 store(__pointer_type __p,
|
|
|
518 memory_order __m = memory_order_seq_cst) volatile noexcept
|
|
|
519 { return _M_b.store(__p, __m); }
|
|
|
520
|
|
|
521 __pointer_type
|
|
|
522 load(memory_order __m = memory_order_seq_cst) const noexcept
|
|
|
523 { return _M_b.load(__m); }
|
|
|
524
|
|
|
525 __pointer_type
|
|
|
526 load(memory_order __m = memory_order_seq_cst) const volatile noexcept
|
|
|
527 { return _M_b.load(__m); }
|
|
|
528
|
|
|
529 __pointer_type
|
|
|
530 exchange(__pointer_type __p,
|
|
|
531 memory_order __m = memory_order_seq_cst) noexcept
|
|
|
532 { return _M_b.exchange(__p, __m); }
|
|
|
533
|
|
|
534 __pointer_type
|
|
|
535 exchange(__pointer_type __p,
|
|
|
536 memory_order __m = memory_order_seq_cst) volatile noexcept
|
|
|
537 { return _M_b.exchange(__p, __m); }
|
|
|
538
|
|
|
539 bool
|
|
|
540 compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2,
|
|
|
541 memory_order __m1, memory_order __m2) noexcept
|
|
|
542 { return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); }
|
|
|
543
|
|
|
544 bool
|
|
|
545 compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2,
|
|
|
546 memory_order __m1,
|
|
|
547 memory_order __m2) volatile noexcept
|
|
|
548 { return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); }
|
|
|
549
|
|
|
550 bool
|
|
|
551 compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2,
|
|
|
552 memory_order __m = memory_order_seq_cst) noexcept
|
|
|
553 {
|
|
|
554 return compare_exchange_weak(__p1, __p2, __m,
|
|
|
555 __cmpexch_failure_order(__m));
|
|
|
556 }
|
|
|
557
|
|
|
558 bool
|
|
|
559 compare_exchange_weak(__pointer_type& __p1, __pointer_type __p2,
|
|
|
560 memory_order __m = memory_order_seq_cst) volatile noexcept
|
|
|
561 {
|
|
|
562 return compare_exchange_weak(__p1, __p2, __m,
|
|
|
563 __cmpexch_failure_order(__m));
|
|
|
564 }
|
|
|
565
|
|
|
566 bool
|
|
|
567 compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2,
|
|
|
568 memory_order __m1, memory_order __m2) noexcept
|
|
|
569 { return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); }
|
|
|
570
|
|
|
571 bool
|
|
|
572 compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2,
|
|
|
573 memory_order __m1,
|
|
|
574 memory_order __m2) volatile noexcept
|
|
|
575 { return _M_b.compare_exchange_strong(__p1, __p2, __m1, __m2); }
|
|
|
576
|
|
|
577 bool
|
|
|
578 compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2,
|
|
|
579 memory_order __m = memory_order_seq_cst) noexcept
|
|
|
580 {
|
|
|
581 return _M_b.compare_exchange_strong(__p1, __p2, __m,
|
|
|
582 __cmpexch_failure_order(__m));
|
|
|
583 }
|
|
|
584
|
|
|
585 bool
|
|
|
586 compare_exchange_strong(__pointer_type& __p1, __pointer_type __p2,
|
|
|
587 memory_order __m = memory_order_seq_cst) volatile noexcept
|
|
|
588 {
|
|
|
589 return _M_b.compare_exchange_strong(__p1, __p2, __m,
|
|
|
590 __cmpexch_failure_order(__m));
|
|
|
591 }
|
|
|
592
|
|
|
593 __pointer_type
|
|
|
594 fetch_add(ptrdiff_t __d,
|
|
|
595 memory_order __m = memory_order_seq_cst) noexcept
|
|
131
|
596 {
|
|
|
597 #if __cplusplus >= 201703L
|
|
|
598 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
599 #endif
|
|
|
600 return _M_b.fetch_add(__d, __m);
|
|
|
601 }
|
|
111
|
602
|
|
|
603 __pointer_type
|
|
|
604 fetch_add(ptrdiff_t __d,
|
|
|
605 memory_order __m = memory_order_seq_cst) volatile noexcept
|
|
131
|
606 {
|
|
|
607 #if __cplusplus >= 201703L
|
|
|
608 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
609 #endif
|
|
|
610 return _M_b.fetch_add(__d, __m);
|
|
|
611 }
|
|
111
|
612
|
|
|
613 __pointer_type
|
|
|
614 fetch_sub(ptrdiff_t __d,
|
|
|
615 memory_order __m = memory_order_seq_cst) noexcept
|
|
131
|
616 {
|
|
|
617 #if __cplusplus >= 201703L
|
|
|
618 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
619 #endif
|
|
|
620 return _M_b.fetch_sub(__d, __m);
|
|
|
621 }
|
|
111
|
622
|
|
|
623 __pointer_type
|
|
|
624 fetch_sub(ptrdiff_t __d,
|
|
|
625 memory_order __m = memory_order_seq_cst) volatile noexcept
|
|
131
|
626 {
|
|
|
627 #if __cplusplus >= 201703L
|
|
|
628 static_assert( is_object<_Tp>::value, "pointer to object type" );
|
|
|
629 #endif
|
|
|
630 return _M_b.fetch_sub(__d, __m);
|
|
|
631 }
|
|
111
|
632 };
|
|
|
633
|
|
|
634
|
|
|
635 /// Explicit specialization for char.
|
|
|
636 template<>
|
|
|
637 struct atomic<char> : __atomic_base<char>
|
|
|
638 {
|
|
|
639 typedef char __integral_type;
|
|
|
640 typedef __atomic_base<char> __base_type;
|
|
|
641
|
|
|
642 atomic() noexcept = default;
|
|
|
643 ~atomic() noexcept = default;
|
|
|
644 atomic(const atomic&) = delete;
|
|
|
645 atomic& operator=(const atomic&) = delete;
|
|
|
646 atomic& operator=(const atomic&) volatile = delete;
|
|
|
647
|
|
|
648 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
649
|
|
|
650 using __base_type::operator __integral_type;
|
|
|
651 using __base_type::operator=;
|
|
|
652
|
|
131
|
653 #if __cplusplus >= 201703L
|
|
111
|
654 static constexpr bool is_always_lock_free = ATOMIC_CHAR_LOCK_FREE == 2;
|
|
|
655 #endif
|
|
|
656 };
|
|
|
657
|
|
|
658 /// Explicit specialization for signed char.
|
|
|
659 template<>
|
|
|
660 struct atomic<signed char> : __atomic_base<signed char>
|
|
|
661 {
|
|
|
662 typedef signed char __integral_type;
|
|
|
663 typedef __atomic_base<signed char> __base_type;
|
|
|
664
|
|
|
665 atomic() noexcept= default;
|
|
|
666 ~atomic() noexcept = default;
|
|
|
667 atomic(const atomic&) = delete;
|
|
|
668 atomic& operator=(const atomic&) = delete;
|
|
|
669 atomic& operator=(const atomic&) volatile = delete;
|
|
|
670
|
|
|
671 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
672
|
|
|
673 using __base_type::operator __integral_type;
|
|
|
674 using __base_type::operator=;
|
|
|
675
|
|
131
|
676 #if __cplusplus >= 201703L
|
|
111
|
677 static constexpr bool is_always_lock_free = ATOMIC_CHAR_LOCK_FREE == 2;
|
|
|
678 #endif
|
|
|
679 };
|
|
|
680
|
|
|
681 /// Explicit specialization for unsigned char.
|
|
|
682 template<>
|
|
|
683 struct atomic<unsigned char> : __atomic_base<unsigned char>
|
|
|
684 {
|
|
|
685 typedef unsigned char __integral_type;
|
|
|
686 typedef __atomic_base<unsigned char> __base_type;
|
|
|
687
|
|
|
688 atomic() noexcept= default;
|
|
|
689 ~atomic() noexcept = default;
|
|
|
690 atomic(const atomic&) = delete;
|
|
|
691 atomic& operator=(const atomic&) = delete;
|
|
|
692 atomic& operator=(const atomic&) volatile = delete;
|
|
|
693
|
|
|
694 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
695
|
|
|
696 using __base_type::operator __integral_type;
|
|
|
697 using __base_type::operator=;
|
|
|
698
|
|
131
|
699 #if __cplusplus >= 201703L
|
|
111
|
700 static constexpr bool is_always_lock_free = ATOMIC_CHAR_LOCK_FREE == 2;
|
|
|
701 #endif
|
|
|
702 };
|
|
|
703
|
|
|
704 /// Explicit specialization for short.
|
|
|
705 template<>
|
|
|
706 struct atomic<short> : __atomic_base<short>
|
|
|
707 {
|
|
|
708 typedef short __integral_type;
|
|
|
709 typedef __atomic_base<short> __base_type;
|
|
|
710
|
|
|
711 atomic() noexcept = default;
|
|
|
712 ~atomic() noexcept = default;
|
|
|
713 atomic(const atomic&) = delete;
|
|
|
714 atomic& operator=(const atomic&) = delete;
|
|
|
715 atomic& operator=(const atomic&) volatile = delete;
|
|
|
716
|
|
|
717 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
718
|
|
|
719 using __base_type::operator __integral_type;
|
|
|
720 using __base_type::operator=;
|
|
|
721
|
|
131
|
722 #if __cplusplus >= 201703L
|
|
111
|
723 static constexpr bool is_always_lock_free = ATOMIC_SHORT_LOCK_FREE == 2;
|
|
|
724 #endif
|
|
|
725 };
|
|
|
726
|
|
|
727 /// Explicit specialization for unsigned short.
|
|
|
728 template<>
|
|
|
729 struct atomic<unsigned short> : __atomic_base<unsigned short>
|
|
|
730 {
|
|
|
731 typedef unsigned short __integral_type;
|
|
|
732 typedef __atomic_base<unsigned short> __base_type;
|
|
|
733
|
|
|
734 atomic() noexcept = default;
|
|
|
735 ~atomic() noexcept = default;
|
|
|
736 atomic(const atomic&) = delete;
|
|
|
737 atomic& operator=(const atomic&) = delete;
|
|
|
738 atomic& operator=(const atomic&) volatile = delete;
|
|
|
739
|
|
|
740 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
741
|
|
|
742 using __base_type::operator __integral_type;
|
|
|
743 using __base_type::operator=;
|
|
|
744
|
|
131
|
745 #if __cplusplus >= 201703L
|
|
111
|
746 static constexpr bool is_always_lock_free = ATOMIC_SHORT_LOCK_FREE == 2;
|
|
|
747 #endif
|
|
|
748 };
|
|
|
749
|
|
|
750 /// Explicit specialization for int.
|
|
|
751 template<>
|
|
|
752 struct atomic<int> : __atomic_base<int>
|
|
|
753 {
|
|
|
754 typedef int __integral_type;
|
|
|
755 typedef __atomic_base<int> __base_type;
|
|
|
756
|
|
|
757 atomic() noexcept = default;
|
|
|
758 ~atomic() noexcept = default;
|
|
|
759 atomic(const atomic&) = delete;
|
|
|
760 atomic& operator=(const atomic&) = delete;
|
|
|
761 atomic& operator=(const atomic&) volatile = delete;
|
|
|
762
|
|
|
763 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
764
|
|
|
765 using __base_type::operator __integral_type;
|
|
|
766 using __base_type::operator=;
|
|
|
767
|
|
131
|
768 #if __cplusplus >= 201703L
|
|
111
|
769 static constexpr bool is_always_lock_free = ATOMIC_INT_LOCK_FREE == 2;
|
|
|
770 #endif
|
|
|
771 };
|
|
|
772
|
|
|
773 /// Explicit specialization for unsigned int.
|
|
|
774 template<>
|
|
|
775 struct atomic<unsigned int> : __atomic_base<unsigned int>
|
|
|
776 {
|
|
|
777 typedef unsigned int __integral_type;
|
|
|
778 typedef __atomic_base<unsigned int> __base_type;
|
|
|
779
|
|
|
780 atomic() noexcept = default;
|
|
|
781 ~atomic() noexcept = default;
|
|
|
782 atomic(const atomic&) = delete;
|
|
|
783 atomic& operator=(const atomic&) = delete;
|
|
|
784 atomic& operator=(const atomic&) volatile = delete;
|
|
|
785
|
|
|
786 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
787
|
|
|
788 using __base_type::operator __integral_type;
|
|
|
789 using __base_type::operator=;
|
|
|
790
|
|
131
|
791 #if __cplusplus >= 201703L
|
|
111
|
792 static constexpr bool is_always_lock_free = ATOMIC_INT_LOCK_FREE == 2;
|
|
|
793 #endif
|
|
|
794 };
|
|
|
795
|
|
|
796 /// Explicit specialization for long.
|
|
|
797 template<>
|
|
|
798 struct atomic<long> : __atomic_base<long>
|
|
|
799 {
|
|
|
800 typedef long __integral_type;
|
|
|
801 typedef __atomic_base<long> __base_type;
|
|
|
802
|
|
|
803 atomic() noexcept = default;
|
|
|
804 ~atomic() noexcept = default;
|
|
|
805 atomic(const atomic&) = delete;
|
|
|
806 atomic& operator=(const atomic&) = delete;
|
|
|
807 atomic& operator=(const atomic&) volatile = delete;
|
|
|
808
|
|
|
809 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
810
|
|
|
811 using __base_type::operator __integral_type;
|
|
|
812 using __base_type::operator=;
|
|
|
813
|
|
131
|
814 #if __cplusplus >= 201703L
|
|
111
|
815 static constexpr bool is_always_lock_free = ATOMIC_LONG_LOCK_FREE == 2;
|
|
|
816 #endif
|
|
|
817 };
|
|
|
818
|
|
|
819 /// Explicit specialization for unsigned long.
|
|
|
820 template<>
|
|
|
821 struct atomic<unsigned long> : __atomic_base<unsigned long>
|
|
|
822 {
|
|
|
823 typedef unsigned long __integral_type;
|
|
|
824 typedef __atomic_base<unsigned long> __base_type;
|
|
|
825
|
|
|
826 atomic() noexcept = default;
|
|
|
827 ~atomic() noexcept = default;
|
|
|
828 atomic(const atomic&) = delete;
|
|
|
829 atomic& operator=(const atomic&) = delete;
|
|
|
830 atomic& operator=(const atomic&) volatile = delete;
|
|
|
831
|
|
|
832 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
833
|
|
|
834 using __base_type::operator __integral_type;
|
|
|
835 using __base_type::operator=;
|
|
|
836
|
|
131
|
837 #if __cplusplus >= 201703L
|
|
111
|
838 static constexpr bool is_always_lock_free = ATOMIC_LONG_LOCK_FREE == 2;
|
|
|
839 #endif
|
|
|
840 };
|
|
|
841
|
|
|
842 /// Explicit specialization for long long.
|
|
|
843 template<>
|
|
|
844 struct atomic<long long> : __atomic_base<long long>
|
|
|
845 {
|
|
|
846 typedef long long __integral_type;
|
|
|
847 typedef __atomic_base<long long> __base_type;
|
|
|
848
|
|
|
849 atomic() noexcept = default;
|
|
|
850 ~atomic() noexcept = default;
|
|
|
851 atomic(const atomic&) = delete;
|
|
|
852 atomic& operator=(const atomic&) = delete;
|
|
|
853 atomic& operator=(const atomic&) volatile = delete;
|
|
|
854
|
|
|
855 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
856
|
|
|
857 using __base_type::operator __integral_type;
|
|
|
858 using __base_type::operator=;
|
|
|
859
|
|
131
|
860 #if __cplusplus >= 201703L
|
|
111
|
861 static constexpr bool is_always_lock_free = ATOMIC_LLONG_LOCK_FREE == 2;
|
|
|
862 #endif
|
|
|
863 };
|
|
|
864
|
|
|
865 /// Explicit specialization for unsigned long long.
|
|
|
866 template<>
|
|
|
867 struct atomic<unsigned long long> : __atomic_base<unsigned long long>
|
|
|
868 {
|
|
|
869 typedef unsigned long long __integral_type;
|
|
|
870 typedef __atomic_base<unsigned long long> __base_type;
|
|
|
871
|
|
|
872 atomic() noexcept = default;
|
|
|
873 ~atomic() noexcept = default;
|
|
|
874 atomic(const atomic&) = delete;
|
|
|
875 atomic& operator=(const atomic&) = delete;
|
|
|
876 atomic& operator=(const atomic&) volatile = delete;
|
|
|
877
|
|
|
878 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
879
|
|
|
880 using __base_type::operator __integral_type;
|
|
|
881 using __base_type::operator=;
|
|
|
882
|
|
131
|
883 #if __cplusplus >= 201703L
|
|
111
|
884 static constexpr bool is_always_lock_free = ATOMIC_LLONG_LOCK_FREE == 2;
|
|
|
885 #endif
|
|
|
886 };
|
|
|
887
|
|
|
888 /// Explicit specialization for wchar_t.
|
|
|
889 template<>
|
|
|
890 struct atomic<wchar_t> : __atomic_base<wchar_t>
|
|
|
891 {
|
|
|
892 typedef wchar_t __integral_type;
|
|
|
893 typedef __atomic_base<wchar_t> __base_type;
|
|
|
894
|
|
|
895 atomic() noexcept = default;
|
|
|
896 ~atomic() noexcept = default;
|
|
|
897 atomic(const atomic&) = delete;
|
|
|
898 atomic& operator=(const atomic&) = delete;
|
|
|
899 atomic& operator=(const atomic&) volatile = delete;
|
|
|
900
|
|
|
901 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
902
|
|
|
903 using __base_type::operator __integral_type;
|
|
|
904 using __base_type::operator=;
|
|
|
905
|
|
131
|
906 #if __cplusplus >= 201703L
|
|
111
|
907 static constexpr bool is_always_lock_free = ATOMIC_WCHAR_T_LOCK_FREE == 2;
|
|
|
908 #endif
|
|
|
909 };
|
|
|
910
|
|
145
|
911 #ifdef _GLIBCXX_USE_CHAR8_T
|
|
|
912 /// Explicit specialization for char8_t.
|
|
|
913 template<>
|
|
|
914 struct atomic<char8_t> : __atomic_base<char8_t>
|
|
|
915 {
|
|
|
916 typedef char8_t __integral_type;
|
|
|
917 typedef __atomic_base<char8_t> __base_type;
|
|
|
918
|
|
|
919 atomic() noexcept = default;
|
|
|
920 ~atomic() noexcept = default;
|
|
|
921 atomic(const atomic&) = delete;
|
|
|
922 atomic& operator=(const atomic&) = delete;
|
|
|
923 atomic& operator=(const atomic&) volatile = delete;
|
|
|
924
|
|
|
925 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
926
|
|
|
927 using __base_type::operator __integral_type;
|
|
|
928 using __base_type::operator=;
|
|
|
929
|
|
|
930 #if __cplusplus > 201402L
|
|
|
931 static constexpr bool is_always_lock_free = ATOMIC_CHAR8_T_LOCK_FREE == 2;
|
|
|
932 #endif
|
|
|
933 };
|
|
|
934 #endif
|
|
|
935
|
|
111
|
936 /// Explicit specialization for char16_t.
|
|
|
937 template<>
|
|
|
938 struct atomic<char16_t> : __atomic_base<char16_t>
|
|
|
939 {
|
|
|
940 typedef char16_t __integral_type;
|
|
|
941 typedef __atomic_base<char16_t> __base_type;
|
|
|
942
|
|
|
943 atomic() noexcept = default;
|
|
|
944 ~atomic() noexcept = default;
|
|
|
945 atomic(const atomic&) = delete;
|
|
|
946 atomic& operator=(const atomic&) = delete;
|
|
|
947 atomic& operator=(const atomic&) volatile = delete;
|
|
|
948
|
|
|
949 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
950
|
|
|
951 using __base_type::operator __integral_type;
|
|
|
952 using __base_type::operator=;
|
|
|
953
|
|
131
|
954 #if __cplusplus >= 201703L
|
|
111
|
955 static constexpr bool is_always_lock_free = ATOMIC_CHAR16_T_LOCK_FREE == 2;
|
|
|
956 #endif
|
|
|
957 };
|
|
|
958
|
|
|
959 /// Explicit specialization for char32_t.
|
|
|
960 template<>
|
|
|
961 struct atomic<char32_t> : __atomic_base<char32_t>
|
|
|
962 {
|
|
|
963 typedef char32_t __integral_type;
|
|
|
964 typedef __atomic_base<char32_t> __base_type;
|
|
|
965
|
|
|
966 atomic() noexcept = default;
|
|
|
967 ~atomic() noexcept = default;
|
|
|
968 atomic(const atomic&) = delete;
|
|
|
969 atomic& operator=(const atomic&) = delete;
|
|
|
970 atomic& operator=(const atomic&) volatile = delete;
|
|
|
971
|
|
|
972 constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
|
|
|
973
|
|
|
974 using __base_type::operator __integral_type;
|
|
|
975 using __base_type::operator=;
|
|
|
976
|
|
131
|
977 #if __cplusplus >= 201703L
|
|
111
|
978 static constexpr bool is_always_lock_free = ATOMIC_CHAR32_T_LOCK_FREE == 2;
|
|
|
979 #endif
|
|
|
980 };
|
|
|
981
|
|
|
982
|
|
|
983 /// atomic_bool
|
|
|
984 typedef atomic<bool> atomic_bool;
|
|
|
985
|
|
|
986 /// atomic_char
|
|
|
987 typedef atomic<char> atomic_char;
|
|
|
988
|
|
|
989 /// atomic_schar
|
|
|
990 typedef atomic<signed char> atomic_schar;
|
|
|
991
|
|
|
992 /// atomic_uchar
|
|
|
993 typedef atomic<unsigned char> atomic_uchar;
|
|
|
994
|
|
|
995 /// atomic_short
|
|
|
996 typedef atomic<short> atomic_short;
|
|
|
997
|
|
|
998 /// atomic_ushort
|
|
|
999 typedef atomic<unsigned short> atomic_ushort;
|
|
|
1000
|
|
|
1001 /// atomic_int
|
|
|
1002 typedef atomic<int> atomic_int;
|
|
|
1003
|
|
|
1004 /// atomic_uint
|
|
|
1005 typedef atomic<unsigned int> atomic_uint;
|
|
|
1006
|
|
|
1007 /// atomic_long
|
|
|
1008 typedef atomic<long> atomic_long;
|
|
|
1009
|
|
|
1010 /// atomic_ulong
|
|
|
1011 typedef atomic<unsigned long> atomic_ulong;
|
|
|
1012
|
|
|
1013 /// atomic_llong
|
|
|
1014 typedef atomic<long long> atomic_llong;
|
|
|
1015
|
|
|
1016 /// atomic_ullong
|
|
|
1017 typedef atomic<unsigned long long> atomic_ullong;
|
|
|
1018
|
|
|
1019 /// atomic_wchar_t
|
|
|
1020 typedef atomic<wchar_t> atomic_wchar_t;
|
|
|
1021
|
|
145
|
1022 #ifdef _GLIBCXX_USE_CHAR8_T
|
|
|
1023 /// atomic_char8_t
|
|
|
1024 typedef atomic<char8_t> atomic_char8_t;
|
|
|
1025 #endif
|
|
|
1026
|
|
111
|
1027 /// atomic_char16_t
|
|
|
1028 typedef atomic<char16_t> atomic_char16_t;
|
|
|
1029
|
|
|
1030 /// atomic_char32_t
|
|
|
1031 typedef atomic<char32_t> atomic_char32_t;
|
|
|
1032
|
|
|
1033 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
|
|
|
1034 // _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
|
1035 // 2441. Exact-width atomic typedefs should be provided
|
|
|
1036
|
|
|
1037 /// atomic_int8_t
|
|
|
1038 typedef atomic<int8_t> atomic_int8_t;
|
|
|
1039
|
|
|
1040 /// atomic_uint8_t
|
|
|
1041 typedef atomic<uint8_t> atomic_uint8_t;
|
|
|
1042
|
|
|
1043 /// atomic_int16_t
|
|
|
1044 typedef atomic<int16_t> atomic_int16_t;
|
|
|
1045
|
|
|
1046 /// atomic_uint16_t
|
|
|
1047 typedef atomic<uint16_t> atomic_uint16_t;
|
|
|
1048
|
|
|
1049 /// atomic_int32_t
|
|
|
1050 typedef atomic<int32_t> atomic_int32_t;
|
|
|
1051
|
|
|
1052 /// atomic_uint32_t
|
|
|
1053 typedef atomic<uint32_t> atomic_uint32_t;
|
|
|
1054
|
|
|
1055 /// atomic_int64_t
|
|
|
1056 typedef atomic<int64_t> atomic_int64_t;
|
|
|
1057
|
|
|
1058 /// atomic_uint64_t
|
|
|
1059 typedef atomic<uint64_t> atomic_uint64_t;
|
|
|
1060
|
|
|
1061
|
|
|
1062 /// atomic_int_least8_t
|
|
|
1063 typedef atomic<int_least8_t> atomic_int_least8_t;
|
|
|
1064
|
|
|
1065 /// atomic_uint_least8_t
|
|
|
1066 typedef atomic<uint_least8_t> atomic_uint_least8_t;
|
|
|
1067
|
|
|
1068 /// atomic_int_least16_t
|
|
|
1069 typedef atomic<int_least16_t> atomic_int_least16_t;
|
|
|
1070
|
|
|
1071 /// atomic_uint_least16_t
|
|
|
1072 typedef atomic<uint_least16_t> atomic_uint_least16_t;
|
|
|
1073
|
|
|
1074 /// atomic_int_least32_t
|
|
|
1075 typedef atomic<int_least32_t> atomic_int_least32_t;
|
|
|
1076
|
|
|
1077 /// atomic_uint_least32_t
|
|
|
1078 typedef atomic<uint_least32_t> atomic_uint_least32_t;
|
|
|
1079
|
|
|
1080 /// atomic_int_least64_t
|
|
|
1081 typedef atomic<int_least64_t> atomic_int_least64_t;
|
|
|
1082
|
|
|
1083 /// atomic_uint_least64_t
|
|
|
1084 typedef atomic<uint_least64_t> atomic_uint_least64_t;
|
|
|
1085
|
|
|
1086
|
|
|
1087 /// atomic_int_fast8_t
|
|
|
1088 typedef atomic<int_fast8_t> atomic_int_fast8_t;
|
|
|
1089
|
|
|
1090 /// atomic_uint_fast8_t
|
|
|
1091 typedef atomic<uint_fast8_t> atomic_uint_fast8_t;
|
|
|
1092
|
|
|
1093 /// atomic_int_fast16_t
|
|
|
1094 typedef atomic<int_fast16_t> atomic_int_fast16_t;
|
|
|
1095
|
|
|
1096 /// atomic_uint_fast16_t
|
|
|
1097 typedef atomic<uint_fast16_t> atomic_uint_fast16_t;
|
|
|
1098
|
|
|
1099 /// atomic_int_fast32_t
|
|
|
1100 typedef atomic<int_fast32_t> atomic_int_fast32_t;
|
|
|
1101
|
|
|
1102 /// atomic_uint_fast32_t
|
|
|
1103 typedef atomic<uint_fast32_t> atomic_uint_fast32_t;
|
|
|
1104
|
|
|
1105 /// atomic_int_fast64_t
|
|
|
1106 typedef atomic<int_fast64_t> atomic_int_fast64_t;
|
|
|
1107
|
|
|
1108 /// atomic_uint_fast64_t
|
|
|
1109 typedef atomic<uint_fast64_t> atomic_uint_fast64_t;
|
|
|
1110 #endif
|
|
|
1111
|
|
|
1112
|
|
|
1113 /// atomic_intptr_t
|
|
|
1114 typedef atomic<intptr_t> atomic_intptr_t;
|
|
|
1115
|
|
|
1116 /// atomic_uintptr_t
|
|
|
1117 typedef atomic<uintptr_t> atomic_uintptr_t;
|
|
|
1118
|
|
|
1119 /// atomic_size_t
|
|
|
1120 typedef atomic<size_t> atomic_size_t;
|
|
|
1121
|
|
|
1122 /// atomic_ptrdiff_t
|
|
|
1123 typedef atomic<ptrdiff_t> atomic_ptrdiff_t;
|
|
|
1124
|
|
|
1125 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
|
|
|
1126 /// atomic_intmax_t
|
|
|
1127 typedef atomic<intmax_t> atomic_intmax_t;
|
|
|
1128
|
|
|
1129 /// atomic_uintmax_t
|
|
|
1130 typedef atomic<uintmax_t> atomic_uintmax_t;
|
|
|
1131 #endif
|
|
|
1132
|
|
|
1133 // Function definitions, atomic_flag operations.
|
|
|
1134 inline bool
|
|
|
1135 atomic_flag_test_and_set_explicit(atomic_flag* __a,
|
|
|
1136 memory_order __m) noexcept
|
|
|
1137 { return __a->test_and_set(__m); }
|
|
|
1138
|
|
|
1139 inline bool
|
|
|
1140 atomic_flag_test_and_set_explicit(volatile atomic_flag* __a,
|
|
|
1141 memory_order __m) noexcept
|
|
|
1142 { return __a->test_and_set(__m); }
|
|
|
1143
|
|
|
1144 inline void
|
|
|
1145 atomic_flag_clear_explicit(atomic_flag* __a, memory_order __m) noexcept
|
|
|
1146 { __a->clear(__m); }
|
|
|
1147
|
|
|
1148 inline void
|
|
|
1149 atomic_flag_clear_explicit(volatile atomic_flag* __a,
|
|
|
1150 memory_order __m) noexcept
|
|
|
1151 { __a->clear(__m); }
|
|
|
1152
|
|
|
1153 inline bool
|
|
|
1154 atomic_flag_test_and_set(atomic_flag* __a) noexcept
|
|
|
1155 { return atomic_flag_test_and_set_explicit(__a, memory_order_seq_cst); }
|
|
|
1156
|
|
|
1157 inline bool
|
|
|
1158 atomic_flag_test_and_set(volatile atomic_flag* __a) noexcept
|
|
|
1159 { return atomic_flag_test_and_set_explicit(__a, memory_order_seq_cst); }
|
|
|
1160
|
|
|
1161 inline void
|
|
|
1162 atomic_flag_clear(atomic_flag* __a) noexcept
|
|
|
1163 { atomic_flag_clear_explicit(__a, memory_order_seq_cst); }
|
|
|
1164
|
|
|
1165 inline void
|
|
|
1166 atomic_flag_clear(volatile atomic_flag* __a) noexcept
|
|
|
1167 { atomic_flag_clear_explicit(__a, memory_order_seq_cst); }
|
|
|
1168
|
|
|
1169
|
|
131
|
1170 template<typename _Tp>
|
|
|
1171 using __atomic_val_t = typename atomic<_Tp>::value_type;
|
|
|
1172 template<typename _Tp>
|
|
|
1173 using __atomic_diff_t = typename atomic<_Tp>::difference_type;
|
|
|
1174
|
|
|
1175 // [atomics.nonmembers] Non-member functions.
|
|
111
|
1176 // Function templates generally applicable to atomic types.
|
|
|
1177 template<typename _ITp>
|
|
|
1178 inline bool
|
|
|
1179 atomic_is_lock_free(const atomic<_ITp>* __a) noexcept
|
|
|
1180 { return __a->is_lock_free(); }
|
|
|
1181
|
|
|
1182 template<typename _ITp>
|
|
|
1183 inline bool
|
|
|
1184 atomic_is_lock_free(const volatile atomic<_ITp>* __a) noexcept
|
|
|
1185 { return __a->is_lock_free(); }
|
|
|
1186
|
|
|
1187 template<typename _ITp>
|
|
|
1188 inline void
|
|
131
|
1189 atomic_init(atomic<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept
|
|
111
|
1190 { __a->store(__i, memory_order_relaxed); }
|
|
|
1191
|
|
|
1192 template<typename _ITp>
|
|
|
1193 inline void
|
|
131
|
1194 atomic_init(volatile atomic<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept
|
|
111
|
1195 { __a->store(__i, memory_order_relaxed); }
|
|
|
1196
|
|
|
1197 template<typename _ITp>
|
|
|
1198 inline void
|
|
131
|
1199 atomic_store_explicit(atomic<_ITp>* __a, __atomic_val_t<_ITp> __i,
|
|
111
|
1200 memory_order __m) noexcept
|
|
|
1201 { __a->store(__i, __m); }
|
|
|
1202
|
|
|
1203 template<typename _ITp>
|
|
|
1204 inline void
|
|
131
|
1205 atomic_store_explicit(volatile atomic<_ITp>* __a, __atomic_val_t<_ITp> __i,
|
|
111
|
1206 memory_order __m) noexcept
|
|
|
1207 { __a->store(__i, __m); }
|
|
|
1208
|
|
|
1209 template<typename _ITp>
|
|
|
1210 inline _ITp
|
|
|
1211 atomic_load_explicit(const atomic<_ITp>* __a, memory_order __m) noexcept
|
|
|
1212 { return __a->load(__m); }
|
|
|
1213
|
|
|
1214 template<typename _ITp>
|
|
|
1215 inline _ITp
|
|
|
1216 atomic_load_explicit(const volatile atomic<_ITp>* __a,
|
|
|
1217 memory_order __m) noexcept
|
|
|
1218 { return __a->load(__m); }
|
|
|
1219
|
|
|
1220 template<typename _ITp>
|
|
|
1221 inline _ITp
|
|
131
|
1222 atomic_exchange_explicit(atomic<_ITp>* __a, __atomic_val_t<_ITp> __i,
|
|
111
|
1223 memory_order __m) noexcept
|
|
|
1224 { return __a->exchange(__i, __m); }
|
|
|
1225
|
|
|
1226 template<typename _ITp>
|
|
|
1227 inline _ITp
|
|
131
|
1228 atomic_exchange_explicit(volatile atomic<_ITp>* __a,
|
|
|
1229 __atomic_val_t<_ITp> __i,
|
|
111
|
1230 memory_order __m) noexcept
|
|
|
1231 { return __a->exchange(__i, __m); }
|
|
|
1232
|
|
|
1233 template<typename _ITp>
|
|
|
1234 inline bool
|
|
|
1235 atomic_compare_exchange_weak_explicit(atomic<_ITp>* __a,
|
|
131
|
1236 __atomic_val_t<_ITp>* __i1,
|
|
|
1237 __atomic_val_t<_ITp> __i2,
|
|
111
|
1238 memory_order __m1,
|
|
|
1239 memory_order __m2) noexcept
|
|
|
1240 { return __a->compare_exchange_weak(*__i1, __i2, __m1, __m2); }
|
|
|
1241
|
|
|
1242 template<typename _ITp>
|
|
|
1243 inline bool
|
|
|
1244 atomic_compare_exchange_weak_explicit(volatile atomic<_ITp>* __a,
|
|
131
|
1245 __atomic_val_t<_ITp>* __i1,
|
|
|
1246 __atomic_val_t<_ITp> __i2,
|
|
111
|
1247 memory_order __m1,
|
|
|
1248 memory_order __m2) noexcept
|
|
|
1249 { return __a->compare_exchange_weak(*__i1, __i2, __m1, __m2); }
|
|
|
1250
|
|
|
1251 template<typename _ITp>
|
|
|
1252 inline bool
|
|
|
1253 atomic_compare_exchange_strong_explicit(atomic<_ITp>* __a,
|
|
131
|
1254 __atomic_val_t<_ITp>* __i1,
|
|
|
1255 __atomic_val_t<_ITp> __i2,
|
|
111
|
1256 memory_order __m1,
|
|
|
1257 memory_order __m2) noexcept
|
|
|
1258 { return __a->compare_exchange_strong(*__i1, __i2, __m1, __m2); }
|
|
|
1259
|
|
|
1260 template<typename _ITp>
|
|
|
1261 inline bool
|
|
|
1262 atomic_compare_exchange_strong_explicit(volatile atomic<_ITp>* __a,
|
|
131
|
1263 __atomic_val_t<_ITp>* __i1,
|
|
|
1264 __atomic_val_t<_ITp> __i2,
|
|
111
|
1265 memory_order __m1,
|
|
|
1266 memory_order __m2) noexcept
|
|
|
1267 { return __a->compare_exchange_strong(*__i1, __i2, __m1, __m2); }
|
|
|
1268
|
|
|
1269
|
|
|
1270 template<typename _ITp>
|
|
|
1271 inline void
|
|
131
|
1272 atomic_store(atomic<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept
|
|
111
|
1273 { atomic_store_explicit(__a, __i, memory_order_seq_cst); }
|
|
|
1274
|
|
|
1275 template<typename _ITp>
|
|
|
1276 inline void
|
|
131
|
1277 atomic_store(volatile atomic<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept
|
|
111
|
1278 { atomic_store_explicit(__a, __i, memory_order_seq_cst); }
|
|
|
1279
|
|
|
1280 template<typename _ITp>
|
|
|
1281 inline _ITp
|
|
|
1282 atomic_load(const atomic<_ITp>* __a) noexcept
|
|
|
1283 { return atomic_load_explicit(__a, memory_order_seq_cst); }
|
|
|
1284
|
|
|
1285 template<typename _ITp>
|
|
|
1286 inline _ITp
|
|
|
1287 atomic_load(const volatile atomic<_ITp>* __a) noexcept
|
|
|
1288 { return atomic_load_explicit(__a, memory_order_seq_cst); }
|
|
|
1289
|
|
|
1290 template<typename _ITp>
|
|
|
1291 inline _ITp
|
|
131
|
1292 atomic_exchange(atomic<_ITp>* __a, __atomic_val_t<_ITp> __i) noexcept
|
|
111
|
1293 { return atomic_exchange_explicit(__a, __i, memory_order_seq_cst); }
|
|
|
1294
|
|
|
1295 template<typename _ITp>
|
|
|
1296 inline _ITp
|
|
131
|
1297 atomic_exchange(volatile atomic<_ITp>* __a,
|
|
|
1298 __atomic_val_t<_ITp> __i) noexcept
|
|
111
|
1299 { return atomic_exchange_explicit(__a, __i, memory_order_seq_cst); }
|
|
|
1300
|
|
|
1301 template<typename _ITp>
|
|
|
1302 inline bool
|
|
|
1303 atomic_compare_exchange_weak(atomic<_ITp>* __a,
|
|
131
|
1304 __atomic_val_t<_ITp>* __i1,
|
|
|
1305 __atomic_val_t<_ITp> __i2) noexcept
|
|
111
|
1306 {
|
|
|
1307 return atomic_compare_exchange_weak_explicit(__a, __i1, __i2,
|
|
|
1308 memory_order_seq_cst,
|
|
|
1309 memory_order_seq_cst);
|
|
|
1310 }
|
|
|
1311
|
|
|
1312 template<typename _ITp>
|
|
|
1313 inline bool
|
|
|
1314 atomic_compare_exchange_weak(volatile atomic<_ITp>* __a,
|
|
131
|
1315 __atomic_val_t<_ITp>* __i1,
|
|
|
1316 __atomic_val_t<_ITp> __i2) noexcept
|
|
111
|
1317 {
|
|
|
1318 return atomic_compare_exchange_weak_explicit(__a, __i1, __i2,
|
|
|
1319 memory_order_seq_cst,
|
|
|
1320 memory_order_seq_cst);
|
|
|
1321 }
|
|
|
1322
|
|
|
1323 template<typename _ITp>
|
|
|
1324 inline bool
|
|
|
1325 atomic_compare_exchange_strong(atomic<_ITp>* __a,
|
|
131
|
1326 __atomic_val_t<_ITp>* __i1,
|
|
|
1327 __atomic_val_t<_ITp> __i2) noexcept
|
|
111
|
1328 {
|
|
|
1329 return atomic_compare_exchange_strong_explicit(__a, __i1, __i2,
|
|
|
1330 memory_order_seq_cst,
|
|
|
1331 memory_order_seq_cst);
|
|
|
1332 }
|
|
|
1333
|
|
|
1334 template<typename _ITp>
|
|
|
1335 inline bool
|
|
|
1336 atomic_compare_exchange_strong(volatile atomic<_ITp>* __a,
|
|
131
|
1337 __atomic_val_t<_ITp>* __i1,
|
|
|
1338 __atomic_val_t<_ITp> __i2) noexcept
|
|
111
|
1339 {
|
|
|
1340 return atomic_compare_exchange_strong_explicit(__a, __i1, __i2,
|
|
|
1341 memory_order_seq_cst,
|
|
|
1342 memory_order_seq_cst);
|
|
|
1343 }
|
|
|
1344
|
|
131
|
1345 // Function templates for atomic_integral and atomic_pointer operations only.
|
|
|
1346 // Some operations (and, or, xor) are only available for atomic integrals,
|
|
|
1347 // which is implemented by taking a parameter of type __atomic_base<_ITp>*.
|
|
|
1348
|
|
111
|
1349 template<typename _ITp>
|
|
|
1350 inline _ITp
|
|
131
|
1351 atomic_fetch_add_explicit(atomic<_ITp>* __a,
|
|
|
1352 __atomic_diff_t<_ITp> __i,
|
|
111
|
1353 memory_order __m) noexcept
|
|
|
1354 { return __a->fetch_add(__i, __m); }
|
|
|
1355
|
|
|
1356 template<typename _ITp>
|
|
|
1357 inline _ITp
|
|
131
|
1358 atomic_fetch_add_explicit(volatile atomic<_ITp>* __a,
|
|
|
1359 __atomic_diff_t<_ITp> __i,
|
|
111
|
1360 memory_order __m) noexcept
|
|
|
1361 { return __a->fetch_add(__i, __m); }
|
|
|
1362
|
|
|
1363 template<typename _ITp>
|
|
|
1364 inline _ITp
|
|
131
|
1365 atomic_fetch_sub_explicit(atomic<_ITp>* __a,
|
|
|
1366 __atomic_diff_t<_ITp> __i,
|
|
111
|
1367 memory_order __m) noexcept
|
|
|
1368 { return __a->fetch_sub(__i, __m); }
|
|
|
1369
|
|
|
1370 template<typename _ITp>
|
|
|
1371 inline _ITp
|
|
131
|
1372 atomic_fetch_sub_explicit(volatile atomic<_ITp>* __a,
|
|
|
1373 __atomic_diff_t<_ITp> __i,
|
|
111
|
1374 memory_order __m) noexcept
|
|
131
|
1375 { return __a->fetch_sub(__i, __m); }
|
|
111
|
1376
|
|
|
1377 template<typename _ITp>
|
|
|
1378 inline _ITp
|
|
131
|
1379 atomic_fetch_and_explicit(__atomic_base<_ITp>* __a,
|
|
|
1380 __atomic_val_t<_ITp> __i,
|
|
111
|
1381 memory_order __m) noexcept
|
|
|
1382 { return __a->fetch_and(__i, __m); }
|
|
|
1383
|
|
|
1384 template<typename _ITp>
|
|
|
1385 inline _ITp
|
|
131
|
1386 atomic_fetch_and_explicit(volatile __atomic_base<_ITp>* __a,
|
|
|
1387 __atomic_val_t<_ITp> __i,
|
|
|
1388 memory_order __m) noexcept
|
|
|
1389 { return __a->fetch_and(__i, __m); }
|
|
|
1390
|
|
|
1391 template<typename _ITp>
|
|
|
1392 inline _ITp
|
|
|
1393 atomic_fetch_or_explicit(__atomic_base<_ITp>* __a,
|
|
|
1394 __atomic_val_t<_ITp> __i,
|
|
111
|
1395 memory_order __m) noexcept
|
|
|
1396 { return __a->fetch_or(__i, __m); }
|
|
|
1397
|
|
|
1398 template<typename _ITp>
|
|
|
1399 inline _ITp
|
|
131
|
1400 atomic_fetch_or_explicit(volatile __atomic_base<_ITp>* __a,
|
|
|
1401 __atomic_val_t<_ITp> __i,
|
|
111
|
1402 memory_order __m) noexcept
|
|
|
1403 { return __a->fetch_or(__i, __m); }
|
|
|
1404
|
|
|
1405 template<typename _ITp>
|
|
|
1406 inline _ITp
|
|
131
|
1407 atomic_fetch_xor_explicit(__atomic_base<_ITp>* __a,
|
|
|
1408 __atomic_val_t<_ITp> __i,
|
|
111
|
1409 memory_order __m) noexcept
|
|
|
1410 { return __a->fetch_xor(__i, __m); }
|
|
|
1411
|
|
|
1412 template<typename _ITp>
|
|
|
1413 inline _ITp
|
|
131
|
1414 atomic_fetch_xor_explicit(volatile __atomic_base<_ITp>* __a,
|
|
|
1415 __atomic_val_t<_ITp> __i,
|
|
|
1416 memory_order __m) noexcept
|
|
|
1417 { return __a->fetch_xor(__i, __m); }
|
|
|
1418
|
|
|
1419 template<typename _ITp>
|
|
|
1420 inline _ITp
|
|
|
1421 atomic_fetch_add(atomic<_ITp>* __a,
|
|
|
1422 __atomic_diff_t<_ITp> __i) noexcept
|
|
111
|
1423 { return atomic_fetch_add_explicit(__a, __i, memory_order_seq_cst); }
|
|
|
1424
|
|
|
1425 template<typename _ITp>
|
|
|
1426 inline _ITp
|
|
131
|
1427 atomic_fetch_add(volatile atomic<_ITp>* __a,
|
|
|
1428 __atomic_diff_t<_ITp> __i) noexcept
|
|
111
|
1429 { return atomic_fetch_add_explicit(__a, __i, memory_order_seq_cst); }
|
|
|
1430
|
|
|
1431 template<typename _ITp>
|
|
|
1432 inline _ITp
|
|
131
|
1433 atomic_fetch_sub(atomic<_ITp>* __a,
|
|
|
1434 __atomic_diff_t<_ITp> __i) noexcept
|
|
111
|
1435 { return atomic_fetch_sub_explicit(__a, __i, memory_order_seq_cst); }
|
|
|
1436
|
|
|
1437 template<typename _ITp>
|
|
|
1438 inline _ITp
|
|
131
|
1439 atomic_fetch_sub(volatile atomic<_ITp>* __a,
|
|
|
1440 __atomic_diff_t<_ITp> __i) noexcept
|
|
|
1441 { return atomic_fetch_sub_explicit(__a, __i, memory_order_seq_cst); }
|
|
111
|
1442
|
|
|
1443 template<typename _ITp>
|
|
|
1444 inline _ITp
|
|
131
|
1445 atomic_fetch_and(__atomic_base<_ITp>* __a,
|
|
|
1446 __atomic_val_t<_ITp> __i) noexcept
|
|
111
|
1447 { return atomic_fetch_and_explicit(__a, __i, memory_order_seq_cst); }
|
|
|
1448
|
|
|
1449 template<typename _ITp>
|
|
|
1450 inline _ITp
|
|
131
|
1451 atomic_fetch_and(volatile __atomic_base<_ITp>* __a,
|
|
|
1452 __atomic_val_t<_ITp> __i) noexcept
|
|
|
1453 { return atomic_fetch_and_explicit(__a, __i, memory_order_seq_cst); }
|
|
|
1454
|
|
|
1455 template<typename _ITp>
|
|
|
1456 inline _ITp
|
|
|
1457 atomic_fetch_or(__atomic_base<_ITp>* __a,
|
|
|
1458 __atomic_val_t<_ITp> __i) noexcept
|
|
111
|
1459 { return atomic_fetch_or_explicit(__a, __i, memory_order_seq_cst); }
|
|
|
1460
|
|
|
1461 template<typename _ITp>
|
|
|
1462 inline _ITp
|
|
131
|
1463 atomic_fetch_or(volatile __atomic_base<_ITp>* __a,
|
|
|
1464 __atomic_val_t<_ITp> __i) noexcept
|
|
111
|
1465 { return atomic_fetch_or_explicit(__a, __i, memory_order_seq_cst); }
|
|
|
1466
|
|
|
1467 template<typename _ITp>
|
|
|
1468 inline _ITp
|
|
131
|
1469 atomic_fetch_xor(__atomic_base<_ITp>* __a,
|
|
|
1470 __atomic_val_t<_ITp> __i) noexcept
|
|
111
|
1471 { return atomic_fetch_xor_explicit(__a, __i, memory_order_seq_cst); }
|
|
|
1472
|
|
|
1473 template<typename _ITp>
|
|
|
1474 inline _ITp
|
|
131
|
1475 atomic_fetch_xor(volatile __atomic_base<_ITp>* __a,
|
|
|
1476 __atomic_val_t<_ITp> __i) noexcept
|
|
111
|
1477 { return atomic_fetch_xor_explicit(__a, __i, memory_order_seq_cst); }
|
|
|
1478
|
|
145
|
1479 #if __cplusplus > 201703L
|
|
|
1480 template<>
|
|
|
1481 struct atomic<float> : __atomic_float<float>
|
|
|
1482 {
|
|
|
1483 atomic() noexcept = default;
|
|
|
1484
|
|
|
1485 constexpr
|
|
|
1486 atomic(float __fp) noexcept : __atomic_float<float>(__fp)
|
|
|
1487 { }
|
|
|
1488
|
|
|
1489 atomic& operator=(const atomic&) volatile = delete;
|
|
|
1490 atomic& operator=(const atomic&) = delete;
|
|
|
1491
|
|
|
1492 using __atomic_float<float>::operator=;
|
|
|
1493 };
|
|
|
1494
|
|
|
1495 template<>
|
|
|
1496 struct atomic<double> : __atomic_float<double>
|
|
|
1497 {
|
|
|
1498 atomic() noexcept = default;
|
|
|
1499
|
|
|
1500 constexpr
|
|
|
1501 atomic(double __fp) noexcept : __atomic_float<double>(__fp)
|
|
|
1502 { }
|
|
|
1503
|
|
|
1504 atomic& operator=(const atomic&) volatile = delete;
|
|
|
1505 atomic& operator=(const atomic&) = delete;
|
|
|
1506
|
|
|
1507 using __atomic_float<double>::operator=;
|
|
|
1508 };
|
|
|
1509
|
|
|
1510 template<>
|
|
|
1511 struct atomic<long double> : __atomic_float<long double>
|
|
|
1512 {
|
|
|
1513 atomic() noexcept = default;
|
|
|
1514
|
|
|
1515 constexpr
|
|
|
1516 atomic(long double __fp) noexcept : __atomic_float<long double>(__fp)
|
|
|
1517 { }
|
|
|
1518
|
|
|
1519 atomic& operator=(const atomic&) volatile = delete;
|
|
|
1520 atomic& operator=(const atomic&) = delete;
|
|
|
1521
|
|
|
1522 using __atomic_float<long double>::operator=;
|
|
|
1523 };
|
|
|
1524
|
|
|
1525 #define __cpp_lib_atomic_ref 201806L
|
|
|
1526
|
|
|
1527 /// Class template to provide atomic operations on a non-atomic variable.
|
|
|
1528 template<typename _Tp>
|
|
|
1529 struct atomic_ref : __atomic_ref<_Tp>
|
|
|
1530 {
|
|
|
1531 explicit
|
|
|
1532 atomic_ref(_Tp& __t) noexcept : __atomic_ref<_Tp>(__t)
|
|
|
1533 { }
|
|
|
1534
|
|
|
1535 atomic_ref& operator=(const atomic_ref&) = delete;
|
|
|
1536
|
|
|
1537 atomic_ref(const atomic_ref&) = default;
|
|
|
1538
|
|
|
1539 using __atomic_ref<_Tp>::operator=;
|
|
|
1540 };
|
|
|
1541
|
|
|
1542 #endif // C++2a
|
|
|
1543
|
|
111
|
1544 // @} group atomics
|
|
|
1545
|
|
|
1546 _GLIBCXX_END_NAMESPACE_VERSION
|
|
|
1547 } // namespace
|
|
|
1548
|
|
|
1549 #endif // C++11
|
|
|
1550
|
|
|
1551 #endif // _GLIBCXX_ATOMIC
|
