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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">ring_queue_spinlock.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="comment">//使用自旋锁完成的线程安全的环形队列。</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>  <span class="comment">//支持多个线程同时push和pop。</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>  <span class="comment">//_Option : 如果队列保存的数据不支持拷贝只支持移动，则需要设置为true；或者数据希望pop后销毁，都需要设置为true。</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  <span class="comment">//_Sty : 内存保持数量和索引的整数类型。用于外部控制队列的结构体大小。</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option = false, <span class="keyword">class</span> _Sty = u<span class="keywordtype">int</span>32_t></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  <span class="keyword">struct </span>ring_queue_spinlock</div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  {</div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  <span class="keyword">using</span> value_type = _Ty;</div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  <span class="keyword">using</span> size_type = _Sty;</div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  </div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  <span class="keyword">static</span> constexpr <span class="keywordtype">bool</span> use_option = _Option;</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  <span class="keyword">using</span> optional_type = std::conditional_t<use_option, std::optional<value_type>, value_type>;</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  ring_queue_spinlock(<span class="keywordtype">size_t</span> sz);</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  ring_queue_spinlock(<span class="keyword">const</span> ring_queue_spinlock&) = <span class="keyword">delete</span>;</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  ring_queue_spinlock(ring_queue_spinlock&&) = <span class="keywordflow">default</span>;</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  ring_queue_spinlock& operator =(<span class="keyword">const</span> ring_queue_spinlock&) = <span class="keyword">delete</span>;</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  ring_queue_spinlock& operator =(ring_queue_spinlock&&) = <span class="keywordflow">default</span>;</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  </div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keyword">auto</span> size() const noexcept->size_type;</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  auto capacity() const noexcept->size_type;</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordtype">bool</span> empty() const noexcept;</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordtype">bool</span> full() const noexcept;</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  template<class U></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordtype">bool</span> try_push(U&& value) noexcept(std::is_nothrow_move_assignable_v<U>);</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordtype">bool</span> try_pop(value_type& value) noexcept(std::is_nothrow_move_assignable_v<value_type>);</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  private:</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  using container_type = std::conditional_t<std::is_same_v<value_type, <span class="keywordtype">bool</span>>, std::unique_ptr<optional_type[]>, std::vector<optional_type>>;</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  container_type m_bufferPtr;</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  size_type m_bufferSize;</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  </div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  size_type m_writeIndex;</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  size_type m_readIndex;</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  mutable resumef::spinlock m_lock;</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="preprocessor">#ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  std::atomic<size_type> m_count;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor"> #endif</span></div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  </div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keyword">auto</span> nextIndex(size_type a_count) <span class="keyword">const</span> noexcept->size_type;</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  };</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  </div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty></div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  ring_queue_spinlock<_Ty, _Option, _Sty>::ring_queue_spinlock(<span class="keywordtype">size_t</span> sz)</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  : m_bufferSize(static_cast<size_type>(sz + 1))</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  , m_writeIndex(0)</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  , m_readIndex(0)</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  , m_count(0)</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  #endif</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  {</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">if</span> constexpr (std::is_same_v<value_type, bool>)</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  m_bufferPtr = container_type{ <span class="keyword">new</span> optional_type[sz + 1] };</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">else</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  m_bufferPtr.resize(sz + 1);</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>  assert(sz < (std::numeric_limits<size_type>::max)());</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  }</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>  <span class="keyword">template</span><<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty></div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">auto</span> ring_queue_spinlock<_Ty, _Option, _Sty>::nextIndex(size_type a_count) <span class="keyword">const</span> noexcept->size_type</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  {</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>size_type<span class="keyword">></span>((a_count + 1) % m_bufferSize);</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>  </div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty></div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keyword">auto</span> ring_queue_spinlock<_Ty, _Option, _Sty>::size() const noexcept->size_type</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> <span class="preprocessor"> #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">return</span> m_count.load(std::memory_order_acquire);</div>
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||
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="preprocessor"> #else</span></div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  std::scoped_lock __guard(this->m_lock);</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  </div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">if</span> (m_writeIndex >= m_readIndex)</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">return</span> (m_writeIndex - m_readIndex);</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">else</span></div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">return</span> (m_bufferSize + m_writeIndex - m_readIndex);</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="preprocessor"> #endif // _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  }</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="keyword">template</span><<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty></div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keyword">auto</span> ring_queue_spinlock<_Ty, _Option, _Sty>::capacity() const noexcept->size_type</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>  <span class="keywordflow">return</span> m_bufferSize - 1;</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  }</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  </div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty></div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordtype">bool</span> ring_queue_spinlock<_Ty, _Option, _Sty>::empty() const noexcept</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> <span class="preprocessor"> #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">return</span> m_count.load(std::memory_order_acquire) == 0;</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="preprocessor"> #else</span></div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  std::scoped_lock __guard(this->m_lock);</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  </div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">return</span> m_writeIndex == m_readIndex;</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="preprocessor"> #endif // _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</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>  </div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty></div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordtype">bool</span> ring_queue_spinlock<_Ty, _Option, _Sty>::full() const noexcept</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  {</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="preprocessor"> #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">return</span> (m_count.load(std::memory_order_acquire) == (m_bufferSize - 1));</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="preprocessor"> #else</span></div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  std::scoped_lock __guard(this->m_lock);</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  </div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">return</span> nextIndex(m_writeIndex) == m_readIndex;</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="preprocessor"> #endif // _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  }</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  </div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty></div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keyword">template</span><<span class="keyword">class</span> U></div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordtype">bool</span> ring_queue_spinlock<_Ty, _Option, _Sty>::try_push(U&& value) noexcept(std::is_nothrow_move_assignable_v<U>)</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  {</div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  std::scoped_lock __guard(this->m_lock);</div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  </div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keyword">auto</span> nextWriteIndex = nextIndex(m_writeIndex);</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">if</span> (nextWriteIndex == m_readIndex)</div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  </div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  assert(m_writeIndex < m_bufferSize);</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  </div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  m_bufferPtr[m_writeIndex] = std::move(value);</div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  m_writeIndex = nextWriteIndex;</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  </div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="preprocessor"> #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  m_count.fetch_add(1, std::memory_order_acq_rel);</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="preprocessor"> #endif</span></div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  }</div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  </div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keyword">template</span><<span class="keyword">class</span> _Ty, <span class="keywordtype">bool</span> _Option, <span class="keyword">class</span> _Sty></div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordtype">bool</span> ring_queue_spinlock<_Ty, _Option, _Sty>::try_pop(value_type& value) noexcept(std::is_nothrow_move_assignable_v<value_type>)</div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  {</div>
|
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  std::scoped_lock __guard(this->m_lock);</div>
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<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="keywordflow">if</span> (m_readIndex == m_writeIndex)</div>
|
||
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
||
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  </div>
|
||
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  optional_type& ov = m_bufferPtr[m_readIndex];</div>
|
||
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">if</span> constexpr (use_option)</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>  value = std::move(ov.value());</div>
|
||
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  ov = std::nullopt;</div>
|
||
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  }</div>
|
||
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">else</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>  value = std::move(ov);</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>  </div>
|
||
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  m_readIndex = nextIndex(m_readIndex);</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="preprocessor"> #ifdef _WITH_LOCK_FREE_Q_KEEP_REAL_SIZE</span></div>
|
||
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  m_count.fetch_sub(1, std::memory_order_acq_rel);</div>
|
||
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="preprocessor"> #endif</span></div>
|
||
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">return</span> <span class="keyword">true</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> }</div>
|
||
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||
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制作者  <a href="http://www.doxygen.org/index.html">
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