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<li class="navelem"><a class="el" href="dir_3c80010775d22af2067790ecc9cdcf9d.html">librf</a></li><li class="navelem"><a class="el" href="dir_54ae0e78d997f6903cdf0996223d047f.html">src</a></li> </ul>
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<div class="title">intrusive_link_queue.h</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#pragma once</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>  </div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="keyword">namespace </span>resumef</div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> {</div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Node, <span class="keyword">class</span> _Nodeptr = _Node*, <span class="keyword">class</span> _Sty = u<span class="keywordtype">int</span>32_t></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>  <span class="keyword">struct </span>intrusive_link_queue</div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>  {</div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  <span class="keyword">using</span> node_type = _Node;</div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  <span class="keyword">using</span> node_ptr_type = _Nodeptr;</div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  <span class="keyword">using</span> size_type = _Sty;</div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  intrusive_link_queue();</div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  </div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  intrusive_link_queue(<span class="keyword">const</span> intrusive_link_queue&) = <span class="keyword">delete</span>;</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  intrusive_link_queue(intrusive_link_queue&&) = <span class="keywordflow">default</span>;</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  intrusive_link_queue& operator =(<span class="keyword">const</span> intrusive_link_queue&) = <span class="keyword">delete</span>;</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  intrusive_link_queue& operator =(intrusive_link_queue&&) = <span class="keywordflow">default</span>;</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  </div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  <span class="keyword">auto</span> size() const noexcept->size_type;</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keywordtype">bool</span> empty() const noexcept;</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keywordtype">void</span> push_back(node_ptr_type node) noexcept;</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  auto try_pop() noexcept->node_ptr_type;</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  private:</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  node_ptr_type _head;</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  node_ptr_type _tail;</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  </div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="preprocessor">#ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  std::atomic<size_type> m_count;</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor"> #endif</span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  };</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  </div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Node, <span class="keyword">class</span> _Nodeptr, <span class="keyword">class</span> _Sty></div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  intrusive_link_queue<_Node, _Nodeptr, _Sty>::intrusive_link_queue()</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  : _head(nullptr)</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  , _tail(nullptr)</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  , m_count(0)</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  #endif</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  {</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  }</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  </div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Node, <span class="keyword">class</span> _Nodeptr, <span class="keyword">class</span> _Sty></div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keyword">auto</span> intrusive_link_queue<_Node, _Nodeptr, _Sty>::size() const noexcept->size_type</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  {</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor"> #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">return</span> m_count.load(std::memory_order_acquire);</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="preprocessor"> #else</span></div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  size_type count = 0;</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">for</span> (node_type* node = _head; node != <span class="keyword">nullptr</span>; node = node->next)</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  ++count;</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">return</span> count;</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor"> #endif // _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  }</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Node, <span class="keyword">class</span> _Nodeptr, <span class="keyword">class</span> _Sty></div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordtype">bool</span> intrusive_link_queue<_Node, _Nodeptr, _Sty>::empty() const noexcept</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  {</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">return</span> _head == <span class="keyword">nullptr</span>;</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  }</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  </div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Node, <span class="keyword">class</span> _Nodeptr, <span class="keyword">class</span> _Sty></div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordtype">void</span> intrusive_link_queue<_Node, _Nodeptr, _Sty>::push_back(node_ptr_type node) noexcept</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  {</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  assert(node != <span class="keyword">nullptr</span>);</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  </div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  node->_next = <span class="keyword">nullptr</span>;</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">if</span> (_head == <span class="keyword">nullptr</span>)</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  {</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  _head = _tail = node;</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  }</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">else</span></div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  {</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  _tail->_next = node;</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  _tail = node;</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  }</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  </div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="preprocessor"> #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  m_count.fetch_add(1, std::memory_order_acq_rel);</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor"> #endif</span></div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  }</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  </div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Node, <span class="keyword">class</span> _Nodeptr, <span class="keyword">class</span> _Sty></div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keyword">auto</span> intrusive_link_queue<_Node, _Nodeptr, _Sty>::try_pop() noexcept->node_ptr_type</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  {</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">if</span> (_head == <span class="keyword">nullptr</span>)</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  </div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  node_ptr_type node = _head;</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  _head = node->_next;</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  node->_next = <span class="keyword">nullptr</span>;</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  </div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">if</span> (_tail == node)</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  {</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  assert(node->_next == <span class="keyword">nullptr</span>);</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  _tail = <span class="keyword">nullptr</span>;</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  }</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  </div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="preprocessor"> #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  m_count.fetch_sub(1, std::memory_order_acq_rel);</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="preprocessor"> #endif</span></div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  </div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> node;</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  }</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> }</div>
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