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<a href="a00974.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// -*- C++ -*-</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Copyright (C) 2007-2018 Free Software Foundation, Inc.</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// This file is part of the GNU ISO C++ Library. This library is free</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// software; you can redistribute it and/or modify it under the terms</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// of the GNU General Public License as published by the Free Software</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Foundation; either version 3, or (at your option) any later</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// version.</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// This library is distributed in the hope that it will be useful, but</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// WITHOUT ANY WARRANTY; without even the implied warranty of</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// General Public License for more details.</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// Under Section 7 of GPL version 3, you are granted additional</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// permissions described in the GCC Runtime Library Exception, version</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// 3.1, as published by the Free Software Foundation.</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// You should have received a copy of the GNU General Public License and</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// a copy of the GCC Runtime Library Exception along with this program;</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// <http://www.gnu.org/licenses/>.</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"></span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">/** @file parallel/workstealing.h</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * @brief Parallelization of embarrassingly parallel execution by</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * means of work-stealing.</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> *</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * Work stealing is described in</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> *</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * R. D. Blumofe and C. E. Leiserson.</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * Scheduling multithreaded computations by work stealing.</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * Journal of the ACM, 46(5):720–748, 1999.</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> *</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * This file is a GNU parallel extension to the Standard C++ Library.</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> */</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment">// Written by Felix Putze.</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#ifndef _GLIBCXX_PARALLEL_WORKSTEALING_H</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor">#define _GLIBCXX_PARALLEL_WORKSTEALING_H 1</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#include <<a class="code" href="a00932.html">parallel/parallel.h</a>></span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#include <<a class="code" href="a00947.html">parallel/random_number.h</a>></span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#include <<a class="code" href="a16527.html">parallel/compatibility.h</a>></span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="keyword">namespace </span><a class="code" href="a01572.html">__gnu_parallel</a></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> {</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor">#define _GLIBCXX_JOB_VOLATILE volatile</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"></span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> /** @brief One __job for a certain thread. */</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _DifferenceTp></div><div class="line"><a name="l00054"></a><span class="lineno"><a class="line" href="a09708.html"> 54</a></span>  <span class="keyword">struct </span><a class="code" href="a09708.html">_Job</a></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  {</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"></span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> /** @brief First element.</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> *</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> * Changed by owning and stealing thread. By stealing thread,</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> * always incremented. */</span></div><div class="line"><a name="l00062"></a><span class="lineno"><a class="line" href="a09708.html#a815b2e740292adbcc40185ebae5b1c67"> 62</a></span>  _GLIBCXX_JOB_VOLATILE _DifferenceType <a class="code" href="a09708.html#a815b2e740292adbcc40185ebae5b1c67">_M_first</a>;</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"></span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"> /** @brief Last element.</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> *</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> * Changed by owning thread only. */</span></div><div class="line"><a name="l00067"></a><span class="lineno"><a class="line" href="a09708.html#a6893a607875d35bea0a2c15b6a448129"> 67</a></span>  _GLIBCXX_JOB_VOLATILE _DifferenceType <a class="code" href="a09708.html#a6893a607875d35bea0a2c15b6a448129">_M_last</a>;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"></span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"> /** @brief Number of elements, i.e. @c _M_last-_M_first+1.</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> *</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> * Changed by owning thread only. */</span></div><div class="line"><a name="l00072"></a><span class="lineno"><a class="line" href="a09708.html#a46f2881dc8a59f16b0cb6761d7f632c4"> 72</a></span>  _GLIBCXX_JOB_VOLATILE _DifferenceType <a class="code" href="a09708.html#a46f2881dc8a59f16b0cb6761d7f632c4">_M_load</a>;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  };</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"></span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> /** @brief Work stealing algorithm for random access iterators.</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> *</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> * Uses O(1) additional memory. Synchronization at job lists is</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> * done with atomic operations.</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> * @param __begin Begin iterator of element sequence.</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> * @param __end End iterator of element sequence.</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> * @param __op User-supplied functor (comparator, predicate, adding</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> * functor, ...).</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> * @param __f Functor to @a process an element with __op (depends on</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> * desired functionality, e. g. for std::for_each(), ...).</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> * @param __r Functor to @a add a single __result to the already</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> * processed elements (depends on functionality).</span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> * @param __base Base value for reduction.</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"> * @param __output Pointer to position where final result is written to</span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"> * @param __bound Maximum number of elements processed (e. g. for</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"> * std::count_n()).</span></div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"> * @return User-supplied functor (that may contain a part of the result).</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"> */</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIter,</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keyword">typename</span> _Op,</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keyword">typename</span> _Fu,</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keyword">typename</span> _Red,</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keyword">typename</span> _Result></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  _Op</div><div class="line"><a name="l00099"></a><span class="lineno"><a class="line" href="a01572.html#a14bdca2e9c62cde7dd8478d972f60272"> 99</a></span>  <a class="code" href="a01572.html#a14bdca2e9c62cde7dd8478d972f60272">__for_each_template_random_access_workstealing</a>(_RAIter __begin,</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  _RAIter __end, _Op __op,</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  _Fu& __f, _Red __r,</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  _Result __base,</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  _Result& __output,</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keyword">typename</span> std::iterator_traits<_RAIter>::difference_type __bound)</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  {</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <a class="code" href="a00878.html#a77fb93c9cecec331ccee755972695128">_GLIBCXX_CALL</a>(__end - __begin)</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keyword">typedef</span> std::iterator_traits<_RAIter> _TraitsType;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> _TraitsType::difference_type _DifferenceType;</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keyword">const</span> <a class="code" href="a09632.html">_Settings</a>& __s = <a class="code" href="a09632.html#abc4965eacae0b49945ebc887cb11adc1">_Settings::get</a>();</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  _DifferenceType __chunk_size =</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  static_cast<_DifferenceType>(__s.workstealing_chunk_size);</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> </div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="comment">// How many jobs?</span></div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  _DifferenceType __length = (__bound < 0) ? (__end - __begin) : __bound;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="comment">// To avoid false sharing in a cache line.</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> __stride = (__s.<a class="code" href="a09632.html#a2918b2f3f97a4fbbcfe990e73ace805b">cache_line_size</a> * 10</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  / <span class="keyword">sizeof</span>(<a class="code" href="a09708.html">_Job<_DifferenceType></a>) + 1);</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="comment">// Total number of threads currently working.</span></div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <a class="code" href="a01572.html#a05e502e51bfc3233671730f74a44dc6a">_ThreadIndex</a> __busy = 0;</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span> </div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <a class="code" href="a09708.html">_Job<_DifferenceType></a> *__job;</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  omp_lock_t __output_lock;</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  omp_init_lock(&__output_lock);</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="comment">// Write base value to output.</span></div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  __output = __base;</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> </div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="comment">// No more threads than jobs, at least one thread.</span></div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <a class="code" href="a01572.html#a05e502e51bfc3233671730f74a44dc6a">_ThreadIndex</a> __num_threads = __gnu_parallel::max<_ThreadIndex></div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  (1, __gnu_parallel::min<_DifferenceType>(__length,</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  __get_max_threads()));</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> </div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="preprocessor"># pragma omp parallel shared(__busy) num_threads(__num_threads)</span></div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  {</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="preprocessor"># pragma omp single</span></div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  {</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  __num_threads = omp_get_num_threads();</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> </div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="comment">// Create job description array.</span></div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  __job = <span class="keyword">new</span> <a class="code" href="a09708.html">_Job<_DifferenceType></a>[__num_threads * __stride];</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  }</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> </div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="comment">// Initialization phase.</span></div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span> </div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="comment">// Flags for every thread if it is doing productive work.</span></div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordtype">bool</span> __iam_working = <span class="keyword">false</span>;</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span> </div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="comment">// Thread id.</span></div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <a class="code" href="a01572.html#a05e502e51bfc3233671730f74a44dc6a">_ThreadIndex</a> __iam = omp_get_thread_num();</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="comment">// This job.</span></div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <a class="code" href="a09708.html">_Job<_DifferenceType></a>& __my_job = __job[__iam * __stride];</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span> </div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="comment">// Random number (for work stealing).</span></div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <a class="code" href="a01572.html#a05e502e51bfc3233671730f74a44dc6a">_ThreadIndex</a> __victim;</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span> </div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="comment">// Local value for reduction.</span></div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  _Result __result = _Result();</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span> </div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="comment">// Number of elements to steal in one attempt.</span></div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  _DifferenceType __steal;</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span> </div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="comment">// Every thread has its own random number generator</span></div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="comment">// (modulo __num_threads).</span></div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <a class="code" href="a09604.html">_RandomNumber</a> __rand_gen(__iam, __num_threads);</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span> </div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="comment">// This thread is currently working.</span></div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="preprocessor"># pragma omp atomic</span></div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  ++__busy;</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span> </div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  __iam_working = <span class="keyword">true</span>;</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span> </div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="comment">// How many jobs per thread? last thread gets the rest.</span></div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  __my_job.<a class="code" href="a09708.html#a815b2e740292adbcc40185ebae5b1c67">_M_first</a> = static_cast<_DifferenceType></div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  (__iam * (__length / __num_threads));</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span> </div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  __my_job.<a class="code" href="a09708.html#a6893a607875d35bea0a2c15b6a448129">_M_last</a> = (__iam == (__num_threads - 1)</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  ? (__length - 1)</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  : ((__iam + 1) * (__length / __num_threads) - 1));</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  __my_job.<a class="code" href="a09708.html#a46f2881dc8a59f16b0cb6761d7f632c4">_M_load</a> = __my_job.<a class="code" href="a09708.html#a6893a607875d35bea0a2c15b6a448129">_M_last</a> - __my_job.<a class="code" href="a09708.html#a815b2e740292adbcc40185ebae5b1c67">_M_first</a> + 1;</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span> </div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="comment">// Init result with _M_first value (to have a base value for reduction)</span></div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordflow">if</span> (__my_job.<a class="code" href="a09708.html#a815b2e740292adbcc40185ebae5b1c67">_M_first</a> <= __my_job.<a class="code" href="a09708.html#a6893a607875d35bea0a2c15b6a448129">_M_last</a>)</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  {</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="comment">// Cannot use volatile variable directly.</span></div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  _DifferenceType __my_first = __my_job.<a class="code" href="a09708.html#a815b2e740292adbcc40185ebae5b1c67">_M_first</a>;</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  __result = __f(__op, __begin + __my_first);</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  ++__my_job.<a class="code" href="a09708.html#a815b2e740292adbcc40185ebae5b1c67">_M_first</a>;</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  --__my_job.<a class="code" href="a09708.html#a46f2881dc8a59f16b0cb6761d7f632c4">_M_load</a>;</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  }</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span> </div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  _RAIter __current;</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span> </div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span> <span class="preprocessor"># pragma omp barrier</span></div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span> </div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="comment">// Actual work phase</span></div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="comment">// Work on own or stolen current start</span></div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">while</span> (__busy > 0)</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  {</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="comment">// Work until no productive thread left.</span></div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="preprocessor"># pragma omp flush(__busy)</span></div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span> </div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="comment">// Thread has own work to do</span></div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">while</span> (__my_job.<a class="code" href="a09708.html#a815b2e740292adbcc40185ebae5b1c67">_M_first</a> <= __my_job.<a class="code" href="a09708.html#a6893a607875d35bea0a2c15b6a448129">_M_last</a>)</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  {</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="comment">// fetch-and-add call</span></div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="comment">// Reserve current job block (size __chunk_size) in my queue.</span></div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  _DifferenceType __current_job =</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  __fetch_and_add<_DifferenceType>(&(__my_job.<a class="code" href="a09708.html#a815b2e740292adbcc40185ebae5b1c67">_M_first</a>),</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  __chunk_size);</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span> </div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="comment">// Update _M_load, to make the three values consistent,</span></div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="comment">// _M_first might have been changed in the meantime</span></div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  __my_job.<a class="code" href="a09708.html#a46f2881dc8a59f16b0cb6761d7f632c4">_M_load</a> = __my_job.<a class="code" href="a09708.html#a6893a607875d35bea0a2c15b6a448129">_M_last</a> - __my_job.<a class="code" href="a09708.html#a815b2e740292adbcc40185ebae5b1c67">_M_first</a> + 1;</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="keywordflow">for</span> (_DifferenceType __job_counter = 0;</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  __job_counter < __chunk_size</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  && __current_job <= __my_job.<a class="code" href="a09708.html#a6893a607875d35bea0a2c15b6a448129">_M_last</a>;</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  ++__job_counter)</div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  {</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="comment">// Yes: process it!</span></div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  __current = __begin + __current_job;</div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  ++__current_job;</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span> </div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="comment">// Do actual work.</span></div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  __result = __r(__result, __f(__op, __current));</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  }</div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span> </div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="preprocessor"># pragma omp flush(__busy)</span></div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  }</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span> </div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="comment">// After reaching this point, a thread's __job list is empty.</span></div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keywordflow">if</span> (__iam_working)</div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  {</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="comment">// This thread no longer has work.</span></div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span> <span class="preprocessor"># pragma omp atomic</span></div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  --__busy;</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span> </div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  __iam_working = <span class="keyword">false</span>;</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  }</div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span> </div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  _DifferenceType __supposed_first, __supposed_last,</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  __supposed_load;</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordflow">do</span></div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  {</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="comment">// Find random nonempty deque (not own), do consistency check.</span></div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <a class="code" href="a01572.html#aaa76236af73146ae89f726921bc3f2cb">__yield</a>();</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="preprocessor"># pragma omp flush(__busy)</span></div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  __victim = __rand_gen();</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  __supposed_first = __job[__victim * __stride].<a class="code" href="a09708.html#a815b2e740292adbcc40185ebae5b1c67">_M_first</a>;</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  __supposed_last = __job[__victim * __stride].<a class="code" href="a09708.html#a6893a607875d35bea0a2c15b6a448129">_M_last</a>;</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  __supposed_load = __job[__victim * __stride].<a class="code" href="a09708.html#a46f2881dc8a59f16b0cb6761d7f632c4">_M_load</a>;</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  }</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keywordflow">while</span> (__busy > 0</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  && ((__supposed_load <= 0)</div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  || ((__supposed_first + __supposed_load - 1)</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  != __supposed_last)));</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span> </div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="keywordflow">if</span> (__busy == 0)</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span> </div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordflow">if</span> (__supposed_load > 0)</div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  {</div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="comment">// Has work and work to do.</span></div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="comment">// Number of elements to steal (at least one).</span></div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  __steal = (__supposed_load < 2) ? 1 : __supposed_load / 2;</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span> </div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="comment">// Push __victim's current start forward.</span></div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  _DifferenceType __stolen_first =</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  __fetch_and_add<_DifferenceType></div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  (&(__job[__victim * __stride]._M_first), __steal);</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  _DifferenceType __stolen_try = (__stolen_first + __steal</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  - _DifferenceType(1));</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span> </div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  __my_job.<a class="code" href="a09708.html#a815b2e740292adbcc40185ebae5b1c67">_M_first</a> = __stolen_first;</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  __my_job.<a class="code" href="a09708.html#a6893a607875d35bea0a2c15b6a448129">_M_last</a> = <a class="code" href="a01572.html#a694c714713cacc857e126157b5472448">__gnu_parallel::min</a>(__stolen_try,</div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  __supposed_last);</div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  __my_job.<a class="code" href="a09708.html#a46f2881dc8a59f16b0cb6761d7f632c4">_M_load</a> = __my_job.<a class="code" href="a09708.html#a6893a607875d35bea0a2c15b6a448129">_M_last</a> - __my_job.<a class="code" href="a09708.html#a815b2e740292adbcc40185ebae5b1c67">_M_first</a> + 1;</div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span> </div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="comment">// Has potential work again.</span></div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span> <span class="preprocessor"># pragma omp atomic</span></div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  ++__busy;</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  __iam_working = <span class="keyword">true</span>;</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span> </div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span> <span class="preprocessor"># pragma omp flush(__busy)</span></div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  }</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span> <span class="preprocessor"># pragma omp flush(__busy)</span></div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  } <span class="comment">// end while __busy > 0</span></div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  <span class="comment">// Add accumulated result to output.</span></div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  omp_set_lock(&__output_lock);</div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  __output = __r(__output, __result);</div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  omp_unset_lock(&__output_lock);</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  }</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span> </div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="keyword">delete</span>[] __job;</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span> </div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  <span class="comment">// Points to last element processed (needed as return value for</span></div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="comment">// some algorithms like transform)</span></div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  __f._M_finish_iterator = __begin + __length;</div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span> </div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  omp_destroy_lock(&__output_lock);</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span> </div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <span class="keywordflow">return</span> __op;</div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  }</div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span> } <span class="comment">// end namespace</span></div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span> </div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span> <span class="preprocessor">#endif </span><span class="comment">/* _GLIBCXX_PARALLEL_WORKSTEALING_H */</span><span class="preprocessor"></span></div><div class="ttc" id="a01572_html_a694c714713cacc857e126157b5472448"><div class="ttname"><a href="a01572.html#a694c714713cacc857e126157b5472448">__gnu_parallel::min</a></div><div class="ttdeci">const _Tp & min(const _Tp &__a, const _Tp &__b)</div><div class="ttdoc">Equivalent to std::min.</div><div class="ttdef"><b>Definition:</b> <a href="a16488_source.html#l00144">parallel/base.h:144</a></div></div>
<div class="ttc" id="a00947_html"><div class="ttname"><a href="a00947.html">random_number.h</a></div><div class="ttdoc">Random number generator based on the Mersenne twister. This file is a GNU parallel extension to the S...</div></div>
<div class="ttc" id="a09708_html_a6893a607875d35bea0a2c15b6a448129"><div class="ttname"><a href="a09708.html#a6893a607875d35bea0a2c15b6a448129">__gnu_parallel::_Job::_M_last</a></div><div class="ttdeci">volatile _DifferenceType _M_last</div><div class="ttdoc">Last element.</div><div class="ttdef"><b>Definition:</b> <a href="a00974_source.html#l00067">workstealing.h:67</a></div></div>
<div class="ttc" id="a09632_html_a2918b2f3f97a4fbbcfe990e73ace805b"><div class="ttname"><a href="a09632.html#a2918b2f3f97a4fbbcfe990e73ace805b">__gnu_parallel::_Settings::cache_line_size</a></div><div class="ttdeci">unsigned int cache_line_size</div><div class="ttdoc">Overestimation of cache line size. Used to avoid false sharing, i.e. elements of different threads ar...</div><div class="ttdef"><b>Definition:</b> <a href="a00959_source.html#l00265">settings.h:265</a></div></div>
<div class="ttc" id="a09708_html_a815b2e740292adbcc40185ebae5b1c67"><div class="ttname"><a href="a09708.html#a815b2e740292adbcc40185ebae5b1c67">__gnu_parallel::_Job::_M_first</a></div><div class="ttdeci">volatile _DifferenceType _M_first</div><div class="ttdoc">First element.</div><div class="ttdef"><b>Definition:</b> <a href="a00974_source.html#l00062">workstealing.h:62</a></div></div>
<div class="ttc" id="a09632_html_abc4965eacae0b49945ebc887cb11adc1"><div class="ttname"><a href="a09632.html#abc4965eacae0b49945ebc887cb11adc1">__gnu_parallel::_Settings::get</a></div><div class="ttdeci">static const _Settings & get()</div><div class="ttdoc">Get the global settings.</div></div>
<div class="ttc" id="a01572_html_a05e502e51bfc3233671730f74a44dc6a"><div class="ttname"><a href="a01572.html#a05e502e51bfc3233671730f74a44dc6a">__gnu_parallel::_ThreadIndex</a></div><div class="ttdeci">uint16_t _ThreadIndex</div><div class="ttdoc">Unsigned integer to index a thread number. The maximum thread number (for each processor) must fit in...</div><div class="ttdef"><b>Definition:</b> <a href="a00968_source.html#l00123">types.h:123</a></div></div>
<div class="ttc" id="a00878_html_a77fb93c9cecec331ccee755972695128"><div class="ttname"><a href="a00878.html#a77fb93c9cecec331ccee755972695128">_GLIBCXX_CALL</a></div><div class="ttdeci">#define _GLIBCXX_CALL(__n)</div><div class="ttdoc">Macro to produce log message when entering a function.</div><div class="ttdef"><b>Definition:</b> <a href="a00878_source.html#l00044">compiletime_settings.h:44</a></div></div>
<div class="ttc" id="a09632_html"><div class="ttname"><a href="a09632.html">__gnu_parallel::_Settings</a></div><div class="ttdoc">class _Settings Run-time settings for the parallel mode including all tunable parameters.</div><div class="ttdef"><b>Definition:</b> <a href="a00959_source.html#l00123">settings.h:123</a></div></div>
<div class="ttc" id="a16527_html"><div class="ttname"><a href="a16527.html">compatibility.h</a></div><div class="ttdoc">Compatibility layer, mostly concerned with atomic operations.</div></div>
<div class="ttc" id="a00932_html"><div class="ttname"><a href="a00932.html">parallel.h</a></div><div class="ttdoc">End-user include file. Provides advanced settings and tuning options. This file is a GNU parallel ext...</div></div>
<div class="ttc" id="a09708_html"><div class="ttname"><a href="a09708.html">__gnu_parallel::_Job</a></div><div class="ttdoc">One __job for a certain thread.</div><div class="ttdef"><b>Definition:</b> <a href="a00974_source.html#l00054">workstealing.h:54</a></div></div>
<div class="ttc" id="a01572_html_a14bdca2e9c62cde7dd8478d972f60272"><div class="ttname"><a href="a01572.html#a14bdca2e9c62cde7dd8478d972f60272">__gnu_parallel::__for_each_template_random_access_workstealing</a></div><div class="ttdeci">_Op __for_each_template_random_access_workstealing(_RAIter __begin, _RAIter __end, _Op __op, _Fu &__f, _Red __r, _Result __base, _Result &__output, typename std::iterator_traits< _RAIter >::difference_type __bound)</div><div class="ttdoc">Work stealing algorithm for random access iterators.</div><div class="ttdef"><b>Definition:</b> <a href="a00974_source.html#l00099">workstealing.h:99</a></div></div>
<div class="ttc" id="a01572_html_aaa76236af73146ae89f726921bc3f2cb"><div class="ttname"><a href="a01572.html#aaa76236af73146ae89f726921bc3f2cb">__gnu_parallel::__yield</a></div><div class="ttdeci">void __yield()</div><div class="ttdoc">Yield control to another thread, without waiting for the end of the time slice.</div><div class="ttdef"><b>Definition:</b> <a href="a16527_source.html#l00121">parallel/compatibility.h:121</a></div></div>
<div class="ttc" id="a09604_html"><div class="ttname"><a href="a09604.html">__gnu_parallel::_RandomNumber</a></div><div class="ttdoc">Random number generator, based on the Mersenne twister.</div><div class="ttdef"><b>Definition:</b> <a href="a00947_source.html#l00042">random_number.h:42</a></div></div>
<div class="ttc" id="a01572_html"><div class="ttname"><a href="a01572.html">__gnu_parallel</a></div><div class="ttdoc">GNU parallel code for public use.</div><div class="ttdef"><b>Definition:</b> <a href="a00869_source.html#l00061">balanced_quicksort.h:61</a></div></div>
<div class="ttc" id="a09708_html_a46f2881dc8a59f16b0cb6761d7f632c4"><div class="ttname"><a href="a09708.html#a46f2881dc8a59f16b0cb6761d7f632c4">__gnu_parallel::_Job::_M_load</a></div><div class="ttdeci">volatile _DifferenceType _M_load</div><div class="ttdoc">Number of elements, i.e. _M_last-_M_first+1.</div><div class="ttdef"><b>Definition:</b> <a href="a00974_source.html#l00072">workstealing.h:72</a></div></div>
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