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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<li class="navelem"><a class="el" href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a class="el" href="dir_0103a8ad82dcc2c51f5cde661b4b5cb7.html">xrpl</a></li><li class="navelem"><a class="el" href="dir_f534ca90a4985f34ab325acfbcd39b84.html">basics</a></li> </ul>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">// Copyright (c) 2022, Nikolaos D. Bougalis &lt;nikb@bougalis.net&gt;</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span> </div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="preprocessor">#ifndef XRPL_BASICS_SPINLOCK_H_INCLUDED</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="preprocessor">#define XRPL_BASICS_SPINLOCK_H_INCLUDED</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span> </div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="preprocessor">#include &lt;xrpl/beast/utility/instrumentation.h&gt;</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span> </div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/atomic.html">atomic</a>&gt;</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/limits.html">limits</a>&gt;</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/type_traits.html">type_traits</a>&gt;</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span> </div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor">#ifndef __aarch64__</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="preprocessor">#include &lt;immintrin.h&gt;</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> </div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceripple.html">ripple</a> {</div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="keyword">namespace </span>detail {</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="keyword">inline</span> <span class="keywordtype">void</span></div>
<div class="foldopen" id="foldopen00030" data-start="{" data-end="}">
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"><a class="line" href="namespaceripple_1_1detail.html#a86d9198b3b1df674eb3345f3ad8f4320"> 30</a></span><a class="code hl_function" href="namespaceripple_1_1detail.html#a86d9198b3b1df674eb3345f3ad8f4320">spin_pause</a>() noexcept</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span>{</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="preprocessor">#ifdef __aarch64__</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="keyword">asm</span> <span class="keyword">volatile</span>(<span class="stringliteral">&quot;yield&quot;</span>);</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="preprocessor">#else</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> _mm_pause();</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span>}</div>
</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span>} <span class="comment">// namespace detail</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> </div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div>
<div class="foldopen" id="foldopen00075" data-start="{" data-end="};">
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"><a class="line" href="classripple_1_1packed__spinlock.html"> 75</a></span><span class="keyword">class </span><a class="code hl_class" href="classripple_1_1packed__spinlock.html">packed_spinlock</a></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span>{</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// clang-format off</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="keyword">static_assert</span>(<a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::is_unsigned_v&lt;T&gt;</a>);</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="keyword">static_assert</span>(<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/atomic/atomic.html">std::atomic&lt;T&gt;::is_always_lock_free</a>);</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="keyword">static_assert</span>(</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::is_same_v</a>&lt;<span class="keyword">decltype</span>(<a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::declval&lt;std::atomic&lt;T&gt;</a>&amp;&gt;().fetch_or(0)), T&gt; &amp;&amp;</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::is_same_v</a>&lt;<span class="keyword">decltype</span>(<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/utility/declval.html">std::declval</a>&lt;<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/atomic/atomic.html">std::atomic&lt;T&gt;</a>&amp;&gt;().<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/atomic/atomic/fetch_and.html">fetch_and</a>(0)), T&gt;,</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="stringliteral">&quot;std::atomic&lt;T&gt;::fetch_and(T) and std::atomic&lt;T&gt;::fetch_and(T) are required by packed_spinlock&quot;</span>);</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="comment">// clang-format on</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> </div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"><a class="line" href="classripple_1_1packed__spinlock.html#a1f775dfb309d7f877b5075c05a29d857"> 87</a></span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/atomic/atomic.html">std::atomic&lt;T&gt;</a>&amp; <a class="code hl_variable" href="classripple_1_1packed__spinlock.html#a1f775dfb309d7f877b5075c05a29d857">bits_</a>;</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"><a class="line" href="classripple_1_1packed__spinlock.html#a7a71c9f47a7e78f43941aecc5f07ec7e"> 88</a></span> T <span class="keyword">const</span> <a class="code hl_variable" href="classripple_1_1packed__spinlock.html#a7a71c9f47a7e78f43941aecc5f07ec7e">mask_</a>;</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> </div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"><a class="line" href="classripple_1_1packed__spinlock.html#a9b50344098f14a88e3cf3bf75f9eca45"> 91</a></span> <a class="code hl_function" href="classripple_1_1packed__spinlock.html#a9b50344098f14a88e3cf3bf75f9eca45">packed_spinlock</a>(<a class="code hl_class" href="classripple_1_1packed__spinlock.html">packed_spinlock</a> <span class="keyword">const</span>&amp;) = <span class="keyword">delete</span>;</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> <a class="code hl_class" href="classripple_1_1packed__spinlock.html">packed_spinlock</a>&amp;</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"><a class="line" href="classripple_1_1packed__spinlock.html#af3fa7eb171fa440abfe894a02242a0be"> 93</a></span> <a class="code hl_function" href="classripple_1_1packed__spinlock.html#af3fa7eb171fa440abfe894a02242a0be">operator=</a>(<a class="code hl_class" href="classripple_1_1packed__spinlock.html">packed_spinlock</a> <span class="keyword">const</span>&amp;) = <span class="keyword">delete</span>;</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> </div>
<div class="foldopen" id="foldopen00103" data-start="{" data-end="}">
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"><a class="line" href="classripple_1_1packed__spinlock.html#a6b795f06719bc2d90ed4f6a6007fb5fe"> 103</a></span> <a class="code hl_function" href="classripple_1_1packed__spinlock.html#a6b795f06719bc2d90ed4f6a6007fb5fe">packed_spinlock</a>(<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/atomic/atomic.html">std::atomic&lt;T&gt;</a>&amp; <a class="code hl_function" href="classripple_1_1packed__spinlock.html#a8d885a8f4e6fc078869345131e76be63">lock</a>, <span class="keywordtype">int</span> index)</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> : <a class="code hl_variable" href="classripple_1_1packed__spinlock.html#a1f775dfb309d7f877b5075c05a29d857">bits_</a>(<a class="code hl_function" href="classripple_1_1packed__spinlock.html#a8d885a8f4e6fc078869345131e76be63">lock</a>), <a class="code hl_variable" href="classripple_1_1packed__spinlock.html#a7a71c9f47a7e78f43941aecc5f07ec7e">mask_</a>(static_cast&lt;T&gt;(1) &lt;&lt; index)</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> {</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> XRPL_ASSERT(</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> index &gt;= 0 &amp;&amp; (<a class="code hl_variable" href="classripple_1_1packed__spinlock.html#a7a71c9f47a7e78f43941aecc5f07ec7e">mask_</a> != 0),</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> <span class="stringliteral">&quot;ripple::packed_spinlock::packed_spinlock : valid index and mask&quot;</span>);</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> }</div>
</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> </div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> [[nodiscard]] <span class="keywordtype">bool</span></div>
<div class="foldopen" id="foldopen00112" data-start="{" data-end="}">
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"><a class="line" href="classripple_1_1packed__spinlock.html#ad544b64b85215e6adcf96a37f7b14503"> 112</a></span> <a class="code hl_function" href="classripple_1_1packed__spinlock.html#ad544b64b85215e6adcf96a37f7b14503">try_lock</a>()</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> {</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> <span class="keywordflow">return</span> (<a class="code hl_variable" href="classripple_1_1packed__spinlock.html#a1f775dfb309d7f877b5075c05a29d857">bits_</a>.fetch_or(<a class="code hl_variable" href="classripple_1_1packed__spinlock.html#a7a71c9f47a7e78f43941aecc5f07ec7e">mask_</a>, <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::memory_order_acquire</a>) &amp; <a class="code hl_variable" href="classripple_1_1packed__spinlock.html#a7a71c9f47a7e78f43941aecc5f07ec7e">mask_</a>) == 0;</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> }</div>
</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> </div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> <span class="keywordtype">void</span></div>
<div class="foldopen" id="foldopen00118" data-start="{" data-end="}">
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"><a class="line" href="classripple_1_1packed__spinlock.html#a8d885a8f4e6fc078869345131e76be63"> 118</a></span> <a class="code hl_function" href="classripple_1_1packed__spinlock.html#a8d885a8f4e6fc078869345131e76be63">lock</a>()</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> {</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> <span class="keywordflow">while</span> (!<a class="code hl_function" href="classripple_1_1packed__spinlock.html#ad544b64b85215e6adcf96a37f7b14503">try_lock</a>())</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> {</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> <span class="comment">// The use of relaxed memory ordering here is intentional and</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> <span class="comment">// serves to help reduce cache coherency traffic during times</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> <span class="comment">// of contention by avoiding writes that would definitely not</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> <span class="comment">// result in the lock being acquired.</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> <span class="keywordflow">while</span> ((<a class="code hl_variable" href="classripple_1_1packed__spinlock.html#a1f775dfb309d7f877b5075c05a29d857">bits_</a>.load(<a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::memory_order_relaxed</a>) &amp; <a class="code hl_variable" href="classripple_1_1packed__spinlock.html#a7a71c9f47a7e78f43941aecc5f07ec7e">mask_</a>) != 0)</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> <a class="code hl_function" href="namespaceripple_1_1detail.html#a86d9198b3b1df674eb3345f3ad8f4320">detail::spin_pause</a>();</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> }</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> }</div>
</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> </div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> <span class="keywordtype">void</span></div>
<div class="foldopen" id="foldopen00132" data-start="{" data-end="}">
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"><a class="line" href="classripple_1_1packed__spinlock.html#a54ab44d231a3a27eda752596b3f69e11"> 132</a></span> <a class="code hl_function" href="classripple_1_1packed__spinlock.html#a54ab44d231a3a27eda752596b3f69e11">unlock</a>()</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> {</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> <a class="code hl_variable" href="classripple_1_1packed__spinlock.html#a1f775dfb309d7f877b5075c05a29d857">bits_</a>.fetch_and(~<a class="code hl_variable" href="classripple_1_1packed__spinlock.html#a7a71c9f47a7e78f43941aecc5f07ec7e">mask_</a>, <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::memory_order_release</a>);</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> }</div>
</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span>};</div>
</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> </div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div>
<div class="foldopen" id="foldopen00151" data-start="{" data-end="};">
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"><a class="line" href="classripple_1_1spinlock.html"> 151</a></span><span class="keyword">class </span><a class="code hl_class" href="classripple_1_1spinlock.html">spinlock</a></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span>{</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> <span class="keyword">static_assert</span>(<a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::is_unsigned_v&lt;T&gt;</a>);</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> <span class="keyword">static_assert</span>(<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/atomic/atomic.html">std::atomic&lt;T&gt;::is_always_lock_free</a>);</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> </div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"><a class="line" href="classripple_1_1spinlock.html#a2da794f4f35024506fcfbf754c68fc95"> 157</a></span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/atomic/atomic.html">std::atomic&lt;T&gt;</a>&amp; <a class="code hl_variable" href="classripple_1_1spinlock.html#a2da794f4f35024506fcfbf754c68fc95">lock_</a>;</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> </div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"><a class="line" href="classripple_1_1spinlock.html#a20d16e13b4586293281bcfeb06abe834"> 160</a></span> <a class="code hl_function" href="classripple_1_1spinlock.html#a20d16e13b4586293281bcfeb06abe834">spinlock</a>(<a class="code hl_class" href="classripple_1_1spinlock.html">spinlock</a> <span class="keyword">const</span>&amp;) = <span class="keyword">delete</span>;</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> <a class="code hl_class" href="classripple_1_1spinlock.html">spinlock</a>&amp;</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"><a class="line" href="classripple_1_1spinlock.html#a0ba6bed87cc5c3da6ce85da9f020358e"> 162</a></span> <a class="code hl_function" href="classripple_1_1spinlock.html#a0ba6bed87cc5c3da6ce85da9f020358e">operator=</a>(<a class="code hl_class" href="classripple_1_1spinlock.html">spinlock</a> <span class="keyword">const</span>&amp;) = <span class="keyword">delete</span>;</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> </div>
<div class="foldopen" id="foldopen00171" data-start="{" data-end="}">
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"><a class="line" href="classripple_1_1spinlock.html#ad7541682f7281ab8d2ce12941923fc41"> 171</a></span> <a class="code hl_function" href="classripple_1_1spinlock.html#ad7541682f7281ab8d2ce12941923fc41">spinlock</a>(<a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/atomic/atomic.html">std::atomic&lt;T&gt;</a>&amp; <a class="code hl_function" href="classripple_1_1spinlock.html#a48794dec2a00dfb965568163ffdfe0b8">lock</a>) : <a class="code hl_variable" href="classripple_1_1spinlock.html#a2da794f4f35024506fcfbf754c68fc95">lock_</a>(<a class="code hl_function" href="classripple_1_1spinlock.html#a48794dec2a00dfb965568163ffdfe0b8">lock</a>)</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> {</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> }</div>
</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span> </div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> [[nodiscard]] <span class="keywordtype">bool</span></div>
<div class="foldopen" id="foldopen00176" data-start="{" data-end="}">
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"><a class="line" href="classripple_1_1spinlock.html#a35d745b9bf6cb4a53fed73e0b6468a8b"> 176</a></span> <a class="code hl_function" href="classripple_1_1spinlock.html#a35d745b9bf6cb4a53fed73e0b6468a8b">try_lock</a>()</div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span> {</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span> T expected = 0;</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> </div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span> <span class="keywordflow">return</span> <a class="code hl_variable" href="classripple_1_1spinlock.html#a2da794f4f35024506fcfbf754c68fc95">lock_</a>.compare_exchange_weak(</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> expected,</div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/numeric_limits.html">std::numeric_limits&lt;T&gt;::max</a>(),</div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::memory_order_acquire</a>,</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span> <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::memory_order_relaxed</a>);</div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> }</div>
</div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> </div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span> <span class="keywordtype">void</span></div>
<div class="foldopen" id="foldopen00188" data-start="{" data-end="}">
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"><a class="line" href="classripple_1_1spinlock.html#a48794dec2a00dfb965568163ffdfe0b8"> 188</a></span> <a class="code hl_function" href="classripple_1_1spinlock.html#a48794dec2a00dfb965568163ffdfe0b8">lock</a>()</div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> {</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> <span class="keywordflow">while</span> (!<a class="code hl_function" href="classripple_1_1spinlock.html#a35d745b9bf6cb4a53fed73e0b6468a8b">try_lock</a>())</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> {</div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> <span class="comment">// The use of relaxed memory ordering here is intentional and</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> <span class="comment">// serves to help reduce cache coherency traffic during times</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> <span class="comment">// of contention by avoiding writes that would definitely not</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> <span class="comment">// result in the lock being acquired.</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span> <span class="keywordflow">while</span> (<a class="code hl_variable" href="classripple_1_1spinlock.html#a2da794f4f35024506fcfbf754c68fc95">lock_</a>.load(<a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::memory_order_relaxed</a>) != 0)</div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span> <a class="code hl_function" href="namespaceripple_1_1detail.html#a86d9198b3b1df674eb3345f3ad8f4320">detail::spin_pause</a>();</div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span> }</div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span> }</div>
</div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span> </div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span> <span class="keywordtype">void</span></div>
<div class="foldopen" id="foldopen00202" data-start="{" data-end="}">
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"><a class="line" href="classripple_1_1spinlock.html#a039c6e7ea6986a10c5b846411d6b7d21"> 202</a></span> <a class="code hl_function" href="classripple_1_1spinlock.html#a039c6e7ea6986a10c5b846411d6b7d21">unlock</a>()</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span> {</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span> <a class="code hl_variable" href="classripple_1_1spinlock.html#a2da794f4f35024506fcfbf754c68fc95">lock_</a>.store(0, <a class="code hl_variableRef" href="http://en.cppreference.com/w/cpp/types/is_same.html">std::memory_order_release</a>);</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span> }</div>
</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span>};</div>
</div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span>} <span class="comment">// namespace ripple</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span> </div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span><span class="preprocessor">#endif</span></div>
<div class="ttc" id="aatomic_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/atomic.html">atomic</a></div></div>
<div class="ttc" id="aclassripple_1_1packed__spinlock_html"><div class="ttname"><a href="classripple_1_1packed__spinlock.html">ripple::packed_spinlock</a></div><div class="ttdoc">Classes to handle arrays of spinlocks packed into a single atomic integer:</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00075">spinlock.h:76</a></div></div>
<div class="ttc" id="aclassripple_1_1packed__spinlock_html_a1f775dfb309d7f877b5075c05a29d857"><div class="ttname"><a href="classripple_1_1packed__spinlock.html#a1f775dfb309d7f877b5075c05a29d857">ripple::packed_spinlock::bits_</a></div><div class="ttdeci">std::atomic&lt; T &gt; &amp; bits_</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00087">spinlock.h:87</a></div></div>
<div class="ttc" id="aclassripple_1_1packed__spinlock_html_a54ab44d231a3a27eda752596b3f69e11"><div class="ttname"><a href="classripple_1_1packed__spinlock.html#a54ab44d231a3a27eda752596b3f69e11">ripple::packed_spinlock::unlock</a></div><div class="ttdeci">void unlock()</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00132">spinlock.h:132</a></div></div>
<div class="ttc" id="aclassripple_1_1packed__spinlock_html_a6b795f06719bc2d90ed4f6a6007fb5fe"><div class="ttname"><a href="classripple_1_1packed__spinlock.html#a6b795f06719bc2d90ed4f6a6007fb5fe">ripple::packed_spinlock::packed_spinlock</a></div><div class="ttdeci">packed_spinlock(std::atomic&lt; T &gt; &amp;lock, int index)</div><div class="ttdoc">A single spinlock packed inside the specified atomic.</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00103">spinlock.h:103</a></div></div>
<div class="ttc" id="aclassripple_1_1packed__spinlock_html_a7a71c9f47a7e78f43941aecc5f07ec7e"><div class="ttname"><a href="classripple_1_1packed__spinlock.html#a7a71c9f47a7e78f43941aecc5f07ec7e">ripple::packed_spinlock::mask_</a></div><div class="ttdeci">T const mask_</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00088">spinlock.h:88</a></div></div>
<div class="ttc" id="aclassripple_1_1packed__spinlock_html_a8d885a8f4e6fc078869345131e76be63"><div class="ttname"><a href="classripple_1_1packed__spinlock.html#a8d885a8f4e6fc078869345131e76be63">ripple::packed_spinlock::lock</a></div><div class="ttdeci">void lock()</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00118">spinlock.h:118</a></div></div>
<div class="ttc" id="aclassripple_1_1packed__spinlock_html_a9b50344098f14a88e3cf3bf75f9eca45"><div class="ttname"><a href="classripple_1_1packed__spinlock.html#a9b50344098f14a88e3cf3bf75f9eca45">ripple::packed_spinlock::packed_spinlock</a></div><div class="ttdeci">packed_spinlock(packed_spinlock const &amp;)=delete</div></div>
<div class="ttc" id="aclassripple_1_1packed__spinlock_html_ad544b64b85215e6adcf96a37f7b14503"><div class="ttname"><a href="classripple_1_1packed__spinlock.html#ad544b64b85215e6adcf96a37f7b14503">ripple::packed_spinlock::try_lock</a></div><div class="ttdeci">bool try_lock()</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00112">spinlock.h:112</a></div></div>
<div class="ttc" id="aclassripple_1_1packed__spinlock_html_af3fa7eb171fa440abfe894a02242a0be"><div class="ttname"><a href="classripple_1_1packed__spinlock.html#af3fa7eb171fa440abfe894a02242a0be">ripple::packed_spinlock::operator=</a></div><div class="ttdeci">packed_spinlock &amp; operator=(packed_spinlock const &amp;)=delete</div></div>
<div class="ttc" id="aclassripple_1_1spinlock_html"><div class="ttname"><a href="classripple_1_1spinlock.html">ripple::spinlock</a></div><div class="ttdoc">A spinlock implemented on top of an atomic integer.</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00151">spinlock.h:152</a></div></div>
<div class="ttc" id="aclassripple_1_1spinlock_html_a039c6e7ea6986a10c5b846411d6b7d21"><div class="ttname"><a href="classripple_1_1spinlock.html#a039c6e7ea6986a10c5b846411d6b7d21">ripple::spinlock::unlock</a></div><div class="ttdeci">void unlock()</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00202">spinlock.h:202</a></div></div>
<div class="ttc" id="aclassripple_1_1spinlock_html_a0ba6bed87cc5c3da6ce85da9f020358e"><div class="ttname"><a href="classripple_1_1spinlock.html#a0ba6bed87cc5c3da6ce85da9f020358e">ripple::spinlock::operator=</a></div><div class="ttdeci">spinlock &amp; operator=(spinlock const &amp;)=delete</div></div>
<div class="ttc" id="aclassripple_1_1spinlock_html_a20d16e13b4586293281bcfeb06abe834"><div class="ttname"><a href="classripple_1_1spinlock.html#a20d16e13b4586293281bcfeb06abe834">ripple::spinlock::spinlock</a></div><div class="ttdeci">spinlock(spinlock const &amp;)=delete</div></div>
<div class="ttc" id="aclassripple_1_1spinlock_html_a2da794f4f35024506fcfbf754c68fc95"><div class="ttname"><a href="classripple_1_1spinlock.html#a2da794f4f35024506fcfbf754c68fc95">ripple::spinlock::lock_</a></div><div class="ttdeci">std::atomic&lt; T &gt; &amp; lock_</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00157">spinlock.h:157</a></div></div>
<div class="ttc" id="aclassripple_1_1spinlock_html_a35d745b9bf6cb4a53fed73e0b6468a8b"><div class="ttname"><a href="classripple_1_1spinlock.html#a35d745b9bf6cb4a53fed73e0b6468a8b">ripple::spinlock::try_lock</a></div><div class="ttdeci">bool try_lock()</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00176">spinlock.h:176</a></div></div>
<div class="ttc" id="aclassripple_1_1spinlock_html_a48794dec2a00dfb965568163ffdfe0b8"><div class="ttname"><a href="classripple_1_1spinlock.html#a48794dec2a00dfb965568163ffdfe0b8">ripple::spinlock::lock</a></div><div class="ttdeci">void lock()</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00188">spinlock.h:188</a></div></div>
<div class="ttc" id="aclassripple_1_1spinlock_html_ad7541682f7281ab8d2ce12941923fc41"><div class="ttname"><a href="classripple_1_1spinlock.html#ad7541682f7281ab8d2ce12941923fc41">ripple::spinlock::spinlock</a></div><div class="ttdeci">spinlock(std::atomic&lt; T &gt; &amp;lock)</div><div class="ttdoc">Grabs the.</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00171">spinlock.h:171</a></div></div>
<div class="ttc" id="adeclval_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/declval.html">std::declval</a></div><div class="ttdeci">T declval(T... args)</div></div>
<div class="ttc" id="afetch_and_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/atomic/atomic/fetch_and.html">std::atomic::fetch_and</a></div><div class="ttdeci">T fetch_and(T... args)</div></div>
<div class="ttc" id="ais_same_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/is_same.html">std::is_same_v</a></div><div class="ttdeci">T is_same_v</div></div>
<div class="ttc" id="alimits_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/limits.html">limits</a></div></div>
<div class="ttc" id="anamespaceripple_1_1detail_html_a86d9198b3b1df674eb3345f3ad8f4320"><div class="ttname"><a href="namespaceripple_1_1detail.html#a86d9198b3b1df674eb3345f3ad8f4320">ripple::detail::spin_pause</a></div><div class="ttdeci">void spin_pause() noexcept</div><div class="ttdoc">Inform the processor that we are in a tight spin-wait loop.</div><div class="ttdef"><b>Definition</b> <a href="spinlock_8h_source.html#l00030">spinlock.h:30</a></div></div>
<div class="ttc" id="anamespaceripple_html"><div class="ttname"><a href="namespaceripple.html">ripple</a></div><div class="ttdoc">Use hash_* containers for keys that do not need a cryptographically secure hashing algorithm.</div><div class="ttdef"><b>Definition</b> <a href="algorithm_8h_source.html#l00006">algorithm.h:6</a></div></div>
<div class="ttc" id="anumeric_limits_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/numeric_limits.html">std::numeric_limits</a></div></div>
<div class="ttc" id="atype_traits_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/type_traits.html">type_traits</a></div></div>
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