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<li class="navelem"><a class="el" href="dir_d6b28f7731906a8cbc4171450df4b180.html">fairmq</a></li><li class="navelem"><a class="el" href="dir_6475741fe3587c0a949798307da6131d.html">shmem</a></li><li class="navelem"><a class="el" href="dir_24b6626c0a083bf470443ad97447d71b.html">prototype</a></li> </ul>
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<div class="title">ShmChunk.h</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/********************************************************************************</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (C) 2014 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH *</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * *</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * This software is distributed under the terms of the * </span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * GNU Lesser General Public Licence (LGPL) version 3, * </span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * copied verbatim in the file "LICENSE" *</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> ********************************************************************************/</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#ifndef SHMCHUNK_H_</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#define SHMCHUNK_H_</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include <thread></span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include <chrono></span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include <boost/interprocess/managed_shared_memory.hpp></span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include <boost/interprocess/smart_ptr/shared_ptr.hpp></span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "FairMQLogger.h"</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">namespace </span><a class="code" href="namespaceboost_1_1interprocess.html">bipc</a> = <a class="code" href="namespaceboost_1_1interprocess.html">boost::interprocess</a>;</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div><div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="classSegmentManager.html"> 28</a></span> <span class="keyword">class </span><a class="code" href="classSegmentManager.html">SegmentManager</a></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> {</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keyword">static</span> <a class="code" href="classSegmentManager.html">SegmentManager</a>& Instance()</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  {</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keyword">static</span> <a class="code" href="classSegmentManager.html">SegmentManager</a> man;</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordflow">return</span> man;</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  }</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordtype">void</span> InitializeSegment(<span class="keyword">const</span> std::string& op, <span class="keyword">const</span> std::string& name, <span class="keyword">const</span> <span class="keywordtype">size_t</span> size = 0)</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  {</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">if</span> (!fSegment)</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  {</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordflow">try</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="keywordflow">if</span> (op == <span class="stringliteral">"open_or_create"</span>)</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  {</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  fSegment = <span class="keyword">new</span> bipc::managed_shared_memory(bipc::open_or_create, name.c_str(), size);</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="keywordflow">else</span> <span class="keywordflow">if</span> (op == <span class="stringliteral">"create_only"</span>)</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>  fSegment = <span class="keyword">new</span> bipc::managed_shared_memory(bipc::create_only, name.c_str(), size);</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  }</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (op == <span class="stringliteral">"open_only"</span>)</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  {</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordtype">int</span> numTries = 0;</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordtype">bool</span> success = <span class="keyword">false</span>;</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="keywordflow">do</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  {</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">try</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  {</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  fSegment = <span class="keyword">new</span> bipc::managed_shared_memory(bipc::open_only, name.c_str());</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  success = <span class="keyword">true</span>;</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  }</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">catch</span> (bipc::interprocess_exception& ie)</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  {</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">if</span> (++numTries == 5)</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  {</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  LOG(error) << <span class="stringliteral">"Could not open shared memory after "</span> << numTries << <span class="stringliteral">" attempts, exiting!"</span>;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  exit(EXIT_FAILURE);</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  }</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  {</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  LOG(debug) << <span class="stringliteral">"Could not open shared memory segment on try "</span> << numTries << <span class="stringliteral">". Retrying in 1 second..."</span>;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  LOG(debug) << ie.what();</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  std::this_thread::sleep_for(std::chrono::milliseconds(1000));</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  }</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  }</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">while</span> (!success);</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  }</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  {</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  LOG(error) << <span class="stringliteral">"Unknown operation when initializing shared memory segment: "</span> << op;</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  }</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  }</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">catch</span> (std::exception& e)</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  {</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  LOG(error) << <span class="stringliteral">"Exception during shared memory segment initialization: "</span> << e.what() << <span class="stringliteral">", application will now exit"</span>;</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  exit(EXIT_FAILURE);</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  }</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  }</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  {</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  LOG(info) << <span class="stringliteral">"Segment already initialized"</span>;</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  }</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  }</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  bipc::managed_shared_memory* Segment()<span class="keyword"> const</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="keyword"> </span>{</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">if</span> (fSegment)</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  {</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> fSegment;</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  }</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">else</span></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>  LOG(error) << <span class="stringliteral">"Segment not initialized"</span>;</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  exit(EXIT_FAILURE);</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  }</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  }</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">private</span>:</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <a class="code" href="classSegmentManager.html">SegmentManager</a>()</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  : fSegment(<span class="keyword">nullptr</span>)</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  {}</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>  bipc::managed_shared_memory* fSegment;</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> };</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div><div class="line"><a name="l00119"></a><span class="lineno"><a class="line" href="structExMetaHeader.html"> 119</a></span> <span class="keyword">struct </span><span class="keyword">alignas</span>(16) <a class="code" href="structExMetaHeader.html">ExMetaHeader</a></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> {</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  uint64_t fSize;</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  bipc::managed_shared_memory::handle_t fHandle;</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> };</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment">// class ShmChunk</span></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment">// {</span></div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment">// public:</span></div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment">// ShmChunk()</span></div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment">// : fHandle()</span></div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment">// , fSize(0)</span></div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment">// {</span></div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment">// }</span></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">// ShmChunk(const size_t size)</span></div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment">// : fHandle()</span></div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment">// , fSize(size)</span></div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment">// {</span></div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment">// void* ptr = SegmentManager::Instance().Segment()->allocate(size);</span></div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment">// fHandle = SegmentManager::Instance().Segment()->get_handle_from_address(ptr);</span></div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment">// }</span></div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span> </div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment">// ~ShmChunk()</span></div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment">// {</span></div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment">// SegmentManager::Instance().Segment()->deallocate(SegmentManager::Instance().Segment()->get_address_from_handle(fHandle));</span></div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment">// }</span></div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment">// bipc::managed_shared_memory::handle_t GetHandle() const</span></div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment">// {</span></div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="comment">// return fHandle;</span></div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment">// }</span></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span> </div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment">// void* GetData() const</span></div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="comment">// {</span></div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="comment">// return SegmentManager::Instance().Segment()->get_address_from_handle(fHandle);</span></div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment">// }</span></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">// size_t GetSize() const</span></div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="comment">// {</span></div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="comment">// return fSize;</span></div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="comment">// }</span></div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span> </div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="comment">// private:</span></div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment">// bipc::managed_shared_memory::handle_t fHandle;</span></div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="comment">// size_t fSize;</span></div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span> <span class="comment">// };</span></div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="comment">// typedef bipc::managed_shared_ptr<ShmChunk, bipc::managed_shared_memory>::type ShPtrType;</span></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">// struct ShPtrOwner</span></div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="comment">// {</span></div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="comment">// ShPtrOwner(const ShPtrType& other)</span></div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="comment">// : fPtr(other)</span></div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span> <span class="comment">// {}</span></div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span> </div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span> <span class="comment">// ShPtrOwner(const ShPtrOwner& other)</span></div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="comment">// : fPtr(other.fPtr)</span></div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment">// {}</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">// ShPtrType fPtr;</span></div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="comment">// };</span></div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span> </div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="preprocessor">#endif </span><span class="comment">/* SHMCHUNK_H_ */</span><span class="preprocessor"></span></div><div class="ttc" id="classSegmentManager_html"><div class="ttname"><a href="classSegmentManager.html">SegmentManager</a></div><div class="ttdef"><b>Definition:</b> ShmChunk.h:28</div></div>
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<div class="ttc" id="namespaceboost_1_1interprocess_html"><div class="ttname"><a href="namespaceboost_1_1interprocess.html">interprocess</a></div></div>
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<div class="ttc" id="structExMetaHeader_html"><div class="ttname"><a href="structExMetaHeader.html">ExMetaHeader</a></div><div class="ttdef"><b>Definition:</b> ShmChunk.h:119</div></div>
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