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基于C++ Coroutines提案 ‘Stackless Resumable Functions’编写的协程库
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  69. <div class="title">switch_scheduler.h</div>  </div>

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  71. <div class="contents">

  72. <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="preprocessor">#pragma once</span></div>

  73. <div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160; </div>

  74. <div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="keyword">namespace </span>resumef</div>

  75. <div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;{</div>

  76. <div class="line"><a name="l00008"></a><span class="lineno"><a class="line" href="structresumef_1_1switch__scheduler__awaitor.html">    8</a></span>&#160;    <span class="keyword">struct </span><a class="code" href="structresumef_1_1switch__scheduler__awaitor.html">switch_scheduler_awaitor</a></div>

  77. <div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;    {</div>

  78. <div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;        <span class="keyword">using</span> value_type = void;</div>

  79. <div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;        <span class="keyword">using</span> <a class="code" href="structresumef_1_1state__t.html">state_type</a> = <a class="code" href="structresumef_1_1state__t.html">state_t&lt;value_type&gt;</a>;</div>

  80. <div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;        <span class="keyword">using</span> promise_type = promise_t&lt;value_type&gt;;</div>

  81. <div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;        <span class="keyword">using</span> lock_type = <span class="keyword">typename</span> <a class="code" href="structresumef_1_1spinlock.html">state_type::lock_type</a>;</div>

  82. <div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160; </div>

  83. <div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;        <a class="code" href="structresumef_1_1switch__scheduler__awaitor.html">switch_scheduler_awaitor</a>(<a class="code" href="structresumef_1_1scheduler__t.html">scheduler_t</a>* sch)</div>

  84. <div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;            :_scheduler(sch) {}</div>

  85. <div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;        <a class="code" href="structresumef_1_1switch__scheduler__awaitor.html">switch_scheduler_awaitor</a>(<span class="keyword">const</span> <a class="code" href="structresumef_1_1switch__scheduler__awaitor.html">switch_scheduler_awaitor</a>&amp;) = <span class="keywordflow">default</span>;</div>

  86. <div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;        <a class="code" href="structresumef_1_1switch__scheduler__awaitor.html">switch_scheduler_awaitor</a>(<a class="code" href="structresumef_1_1switch__scheduler__awaitor.html">switch_scheduler_awaitor</a>&amp;&amp;) = <span class="keywordflow">default</span>;</div>

  87. <div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160; </div>

  88. <div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;        <a class="code" href="structresumef_1_1switch__scheduler__awaitor.html">switch_scheduler_awaitor</a>&amp; operator = (<span class="keyword">const</span> <a class="code" href="structresumef_1_1switch__scheduler__awaitor.html">switch_scheduler_awaitor</a>&amp;) = <span class="keywordflow">default</span>;</div>

  89. <div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;        <a class="code" href="structresumef_1_1switch__scheduler__awaitor.html">switch_scheduler_awaitor</a>&amp; operator = (<a class="code" href="structresumef_1_1switch__scheduler__awaitor.html">switch_scheduler_awaitor</a>&amp;&amp;) = <span class="keywordflow">default</span>;</div>

  90. <div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160; </div>

  91. <div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;        <span class="keywordtype">bool</span> await_ready() noexcept</div>

  92. <div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;        {</div>

  93. <div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;            <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>

  94. <div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;        }</div>

  95. <div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160; </div>

  96. <div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;        <span class="keyword">template</span>&lt;<span class="keyword">class</span> _PromiseT, <span class="keyword">typename</span> = std::enable_if_t&lt;traits::is_promise_v&lt;_PromiseT&gt;&gt;&gt;</div>

  97. <div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;        <span class="keywordtype">bool</span> await_suspend(coroutine_handle&lt;_PromiseT&gt; handler)</div>

  98. <div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;        {</div>

  99. <div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;            _PromiseT&amp; promise = handler.promise();</div>

  100. <div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;            <span class="keyword">auto</span>* sptr = promise.get_state();</div>

  101. <div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;            <span class="keywordflow">if</span> (sptr-&gt;switch_scheduler_await_suspend(_scheduler))</div>

  102. <div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;            {</div>

  103. <div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;                <a class="code" href="structresumef_1_1counted__ptr.html">counted_ptr&lt;state_t&lt;void&gt;</a>&gt; _state = state_future_t::_Alloc_state&lt;state_type&gt;(<span class="keyword">true</span>);</div>

  104. <div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;                _state-&gt;set_value();</div>

  105. <div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;                _state-&gt;future_await_suspend(handler);</div>

  106. <div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160; </div>

  107. <div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;                <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>

  108. <div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;            }</div>

  109. <div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;            <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>

  110. <div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;        }</div>

  111. <div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160; </div>

  112. <div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;        <span class="keywordtype">void</span> await_resume() noexcept</div>

  113. <div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;        {</div>

  114. <div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;        }</div>

  115. <div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160; </div>

  116. <div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    <span class="keyword">private</span>:</div>

  117. <div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;        <a class="code" href="structresumef_1_1scheduler__t.html">scheduler_t</a>* _scheduler;</div>

  118. <div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="preprocessor">#ifdef DOXYGEN_SKIP_PROPERTY</span></div>

  119. <div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;    <span class="keyword">public</span>:</div>

  120. <div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;        <span class="keyword">static</span> <a class="code" href="structresumef_1_1switch__scheduler__awaitor.html">switch_scheduler_awaitor</a> <a class="code" href="structresumef_1_1switch__scheduler__awaitor.html#ad895f4414bfb91fde51ac735420246a9">via</a>(<a class="code" href="structresumef_1_1scheduler__t.html">scheduler_t</a>&amp; sch) noexcept;</div>

  121. <div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160; </div>

  122. <div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;        <span class="keyword">static</span> <a class="code" href="structresumef_1_1switch__scheduler__awaitor.html">switch_scheduler_awaitor</a> <a class="code" href="structresumef_1_1switch__scheduler__awaitor.html#ad895f4414bfb91fde51ac735420246a9">via</a>(<a class="code" href="structresumef_1_1scheduler__t.html">scheduler_t</a>* sch) noexcept;</div>

  123. <div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="preprocessor">#endif  //DOXYGEN_SKIP_PROPERTY</span></div>

  124. <div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    };</div>

  125. <div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160; </div>

  126. <div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;    <span class="comment">//由于跟when_all/when_any混用的时候，在clang上编译失败：</span></div>

  127. <div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    <span class="comment">//clang把scheduler_t判断成一个is_awaitable，且放弃选择when_all/any(scheduler_t&amp; sch, ...)版本</span></div>

  128. <div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;    <span class="comment">//故放弃这种用法</span></div>

  129. <div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    <span class="comment">//inline switch_scheduler_awaitor operator co_await(scheduler_t&amp; sch) noexcept</span></div>

  130. <div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    <span class="comment">//{</span></div>

  131. <div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;    <span class="comment">//  return { &amp;sch };</span></div>

  132. <div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    <span class="comment">//}</span></div>

  133. <div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160; </div>

  134. <div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    <span class="keyword">inline</span> <a class="code" href="structresumef_1_1switch__scheduler__awaitor.html">switch_scheduler_awaitor</a> via(<a class="code" href="structresumef_1_1scheduler__t.html">scheduler_t</a>&amp; sch) noexcept</div>

  135. <div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    {</div>

  136. <div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;        <span class="keywordflow">return</span> { &amp;sch };</div>

  137. <div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    }</div>

  138. <div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160; </div>

  139. <div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;    <span class="keyword">inline</span> switch_scheduler_awaitor via(scheduler_t* sch) noexcept</div>

  140. <div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    {</div>

  141. <div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;        <span class="keywordflow">return</span> { sch };</div>

  142. <div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;    }</div>

  143. <div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160; </div>

  144. <div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;}</div>

  145. </div><!-- fragment --></div><!-- contents -->

  146. <div class="ttc" id="astructresumef_1_1scheduler__t_html"><div class="ttname"><a href="structresumef_1_1scheduler__t.html">resumef::scheduler_t</a></div><div class="ttdoc">协程调度器。</div><div class="ttdef"><b>Definition:</b> scheduler.h:10</div></div>

  147. <div class="ttc" id="astructresumef_1_1counted__ptr_html"><div class="ttname"><a href="structresumef_1_1counted__ptr.html">resumef::counted_ptr</a></div><div class="ttdoc">专用与state的智能计数指针，通过管理state内嵌的引用计数来管理state的生存期。</div><div class="ttdef"><b>Definition:</b> counted_ptr.h:9</div></div>

  148. <div class="ttc" id="astructresumef_1_1spinlock_html"><div class="ttname"><a href="structresumef_1_1spinlock.html">resumef::spinlock</a></div><div class="ttdoc">一个自旋锁实现。</div><div class="ttdef"><b>Definition:</b> spinlock.h:14</div></div>

  149. <div class="ttc" id="astructresumef_1_1switch__scheduler__awaitor_html_ad895f4414bfb91fde51ac735420246a9"><div class="ttname"><a href="structresumef_1_1switch__scheduler__awaitor.html#ad895f4414bfb91fde51ac735420246a9">resumef::switch_scheduler_awaitor::via</a></div><div class="ttdeci">static switch_scheduler_awaitor via(scheduler_t &amp;sch) noexcept</div><div class="ttdoc">将本协程切换到指定调度器上运行。</div></div>

  150. <div class="ttc" id="astructresumef_1_1state__t_html"><div class="ttname"><a href="structresumef_1_1state__t.html">resumef::state_t</a></div><div class="ttdoc">专用于future_t&lt;&gt;的state类。</div><div class="ttdef"><b>Definition:</b> state.h:217</div></div>

  151. <div class="ttc" id="astructresumef_1_1switch__scheduler__awaitor_html"><div class="ttname"><a href="structresumef_1_1switch__scheduler__awaitor.html">resumef::switch_scheduler_awaitor</a></div><div class="ttdoc">切换协程的可等待对象。</div><div class="ttdef"><b>Definition:</b> switch_scheduler.h:8</div></div>

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