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<a href="mpmc__blocking__q_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="preprocessor">#pragma once</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;</div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment">// Copyright(c) 2018 Gabi Melman.</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment">// Distributed under the MIT License (http://opensource.org/licenses/MIT)</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;</div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment">// multi producer-multi consumer blocking queue.</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment">// enqueue(..) - will block until room found to put the new message.</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment">// enqueue_nowait(..) - will return immediately with false if no room left in</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment">// the queue.</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment">// dequeue_for(..) - will block until the queue is not empty or timeout have</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment">// passed.</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="circular__q_8h.html">spdlog/details/circular_q.h</a>&quot;</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="preprocessor">#include &lt;condition_variable&gt;</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="preprocessor">#include &lt;mutex&gt;</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacespdlog.html">spdlog</a> {</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="keyword">namespace </span>details {</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html"> 24</a></span>&#160;<span class="keyword">class </span><a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html">mpmc_blocking_queue</a></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;{</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00027"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#abb22a6f25c5fd96af5b163dc93eec397"> 27</a></span>&#160; <span class="keyword">using</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#abb22a6f25c5fd96af5b163dc93eec397">item_type</a> = T;</div><div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#ace609561c8f631202988ec49f95422fa"> 28</a></span>&#160; <span class="keyword">explicit</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#ace609561c8f631202988ec49f95422fa">mpmc_blocking_queue</a>(<span class="keywordtype">size_t</span> max_items)</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; : q_(max_items)</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; {</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; }</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;<span class="preprocessor">#ifndef __MINGW32__</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; <span class="comment">// try to enqueue and block if no room left</span></div><div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a3795640b651fcb2de66a21ef2bc221f1"> 35</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a3795640b651fcb2de66a21ef2bc221f1">enqueue</a>(T &amp;&amp;item)</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; {</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; {</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; pop_cv_.wait(lock, [<span class="keyword">this</span>] { <span class="keywordflow">return</span> !this-&gt;q_.full(); });</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; q_.push_back(std::move(item));</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; }</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; push_cv_.notify_one();</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; }</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; <span class="comment">// enqueue immediately. overrun oldest message in the queue if no room left.</span></div><div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a1280489c9035a705f50f04905a5ed394"> 46</a></span>&#160; <span class="keywordtype">void</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a1280489c9035a705f50f04905a5ed394">enqueue_nowait</a>(T &amp;&amp;item)</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; {</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; {</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; q_.push_back(std::move(item));</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; }</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; push_cv_.notify_one();</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; }</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="comment">// try to dequeue item. if no item found. wait upto timeout and try again</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; <span class="comment">// Return true, if succeeded dequeue item, false otherwise</span></div><div class="line"><a name="l00057"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#af4015ea1657b393755f34d76c97a28d1"> 57</a></span>&#160; <span class="keywordtype">bool</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#af4015ea1657b393755f34d76c97a28d1">dequeue_for</a>(T &amp;popped_item, std::chrono::milliseconds wait_duration)</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; {</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; {</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; <span class="keywordflow">if</span> (!push_cv_.wait_for(lock, wait_duration, [<span class="keyword">this</span>] { return !this-&gt;q_.empty(); }))</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; {</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; }</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; q_.pop_front(popped_item);</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; }</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; pop_cv_.notify_one();</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; }</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; <span class="comment">// apparently mingw deadlocks if the mutex is released before cv.notify_one(),</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="comment">// so release the mutex at the very end each function.</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <span class="comment">// try to enqueue and block if no room left</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; <span class="keywordtype">void</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a3795640b651fcb2de66a21ef2bc221f1">enqueue</a>(T &amp;&amp;item)</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; {</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; pop_cv_.wait(lock, [<span class="keyword">this</span>] { <span class="keywordflow">return</span> !this-&gt;q_.full(); });</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; q_.push_back(std::move(item));</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; push_cv_.notify_one();</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; }</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160;</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; <span class="comment">// enqueue immediately. overrun oldest message in the queue if no room left.</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; <span class="keywordtype">void</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a1280489c9035a705f50f04905a5ed394">enqueue_nowait</a>(T &amp;&amp;item)</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; {</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; q_.push_back(std::move(item));</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; push_cv_.notify_one();</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; }</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160;</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; <span class="comment">// try to dequeue item. if no item found. wait upto timeout and try again</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <span class="comment">// Return true, if succeeded dequeue item, false otherwise</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; <span class="keywordtype">bool</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#af4015ea1657b393755f34d76c97a28d1">dequeue_for</a>(T &amp;popped_item, std::chrono::milliseconds wait_duration)</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; {</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; <span class="keywordflow">if</span> (!push_cv_.wait_for(lock, wait_duration, [<span class="keyword">this</span>] { return !this-&gt;q_.empty(); }))</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; {</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; }</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; q_.pop_front(popped_item);</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; pop_cv_.notify_one();</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; }</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160;</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160;</div><div class="line"><a name="l00108"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a15e3d12dff953034d5aad5590b8282cd"> 108</a></span>&#160; <span class="keywordtype">size_t</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a15e3d12dff953034d5aad5590b8282cd">overrun_counter</a>()</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; {</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; <span class="keywordflow">return</span> q_.overrun_counter();</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; }</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160;</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160;<span class="keyword">private</span>:</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; std::mutex queue_mutex_;</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; std::condition_variable push_cv_;</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; std::condition_variable pop_cv_;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; <a class="code" href="classspdlog_1_1details_1_1circular__q.html">spdlog::details::circular_q&lt;T&gt;</a> q_;</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160;};</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160;} <span class="comment">// namespace details</span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160;} <span class="comment">// namespace spdlog</span></div><div class="ttc" id="classspdlog_1_1details_1_1mpmc__blocking__queue_html_a1280489c9035a705f50f04905a5ed394"><div class="ttname"><a href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a1280489c9035a705f50f04905a5ed394">spdlog::details::mpmc_blocking_queue::enqueue_nowait</a></div><div class="ttdeci">void enqueue_nowait(T &amp;&amp;item)</div><div class="ttdef"><b>Definition:</b> <a href="mpmc__blocking__q_8h_source.html#l00046">mpmc_blocking_q.h:46</a></div></div>
<div class="ttc" id="classspdlog_1_1details_1_1mpmc__blocking__queue_html_ace609561c8f631202988ec49f95422fa"><div class="ttname"><a href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#ace609561c8f631202988ec49f95422fa">spdlog::details::mpmc_blocking_queue::mpmc_blocking_queue</a></div><div class="ttdeci">mpmc_blocking_queue(size_t max_items)</div><div class="ttdef"><b>Definition:</b> <a href="mpmc__blocking__q_8h_source.html#l00028">mpmc_blocking_q.h:28</a></div></div>
<div class="ttc" id="classspdlog_1_1details_1_1mpmc__blocking__queue_html_af4015ea1657b393755f34d76c97a28d1"><div class="ttname"><a href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#af4015ea1657b393755f34d76c97a28d1">spdlog::details::mpmc_blocking_queue::dequeue_for</a></div><div class="ttdeci">bool dequeue_for(T &amp;popped_item, std::chrono::milliseconds wait_duration)</div><div class="ttdef"><b>Definition:</b> <a href="mpmc__blocking__q_8h_source.html#l00057">mpmc_blocking_q.h:57</a></div></div>
<div class="ttc" id="classspdlog_1_1details_1_1mpmc__blocking__queue_html"><div class="ttname"><a href="classspdlog_1_1details_1_1mpmc__blocking__queue.html">spdlog::details::mpmc_blocking_queue</a></div><div class="ttdef"><b>Definition:</b> <a href="mpmc__blocking__q_8h_source.html#l00024">mpmc_blocking_q.h:24</a></div></div>
<div class="ttc" id="namespacespdlog_html"><div class="ttname"><a href="namespacespdlog.html">spdlog</a></div><div class="ttdef"><b>Definition:</b> <a href="async_8h_source.html#l00027">async.h:27</a></div></div>
<div class="ttc" id="classspdlog_1_1details_1_1mpmc__blocking__queue_html_a15e3d12dff953034d5aad5590b8282cd"><div class="ttname"><a href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a15e3d12dff953034d5aad5590b8282cd">spdlog::details::mpmc_blocking_queue::overrun_counter</a></div><div class="ttdeci">size_t overrun_counter()</div><div class="ttdef"><b>Definition:</b> <a href="mpmc__blocking__q_8h_source.html#l00108">mpmc_blocking_q.h:108</a></div></div>
<div class="ttc" id="classspdlog_1_1details_1_1mpmc__blocking__queue_html_a3795640b651fcb2de66a21ef2bc221f1"><div class="ttname"><a href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a3795640b651fcb2de66a21ef2bc221f1">spdlog::details::mpmc_blocking_queue::enqueue</a></div><div class="ttdeci">void enqueue(T &amp;&amp;item)</div><div class="ttdef"><b>Definition:</b> <a href="mpmc__blocking__q_8h_source.html#l00035">mpmc_blocking_q.h:35</a></div></div>
<div class="ttc" id="classspdlog_1_1details_1_1circular__q_html"><div class="ttname"><a href="classspdlog_1_1details_1_1circular__q.html">spdlog::details::circular_q</a></div><div class="ttdef"><b>Definition:</b> <a href="circular__q_8h_source.html#l00014">circular_q.h:14</a></div></div>
<div class="ttc" id="classspdlog_1_1details_1_1mpmc__blocking__queue_html_abb22a6f25c5fd96af5b163dc93eec397"><div class="ttname"><a href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#abb22a6f25c5fd96af5b163dc93eec397">spdlog::details::mpmc_blocking_queue&lt; item_type &gt;::item_type</a></div><div class="ttdeci">item_type item_type</div><div class="ttdef"><b>Definition:</b> <a href="mpmc__blocking__q_8h_source.html#l00027">mpmc_blocking_q.h:27</a></div></div>
<div class="ttc" id="circular__q_8h_html"><div class="ttname"><a href="circular__q_8h.html">circular_q.h</a></div></div>
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