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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> # Crash Course: cooperative scheduler</div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <!--</div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> @cond TURN_OFF_DOXYGEN</div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> --></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> # Table of Contents</div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> * [Introduction](#introduction)</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> * [The process](#the-process)</div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  * [Adaptor](#adaptor)</div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> * [The scheduler](#the-scheduler)</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <!--</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> @endcond TURN_OFF_DOXYGEN</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> --></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> # Introduction</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> Sometimes processes are a useful tool to work around the strict definition of a</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> system and introduce logic in a different way, usually without resorting to the</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> introduction of other components.</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> `EnTT` offers a minimal support to this paradigm by introducing a few classes</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> that users can use to define and execute cooperative processes.</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> # The process</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> A typical process must inherit from the `process` class template that stays true</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> to the CRTP idiom. Moreover, derived classes must specify what's the intended</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> type for elapsed times.</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> </div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> A process should expose publicly the following member functions whether</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> required (note that it isn't required to define a function unless the derived</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> class wants to _override_ the default behavior):</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> * `void update(Delta, void *);`</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>  It's invoked once per tick until a process is explicitly aborted or it</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  terminates either with or without errors. Even though it's not mandatory to</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  declare this member function, as a rule of thumb each process should at</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  least define it to work properly. The `void *` parameter is an opaque pointer</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  to user data (if any) forwarded directly to the process during an update.</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> * `void init();`</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>  It's invoked when the process joins the running queue of a scheduler. This</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  happens as soon as it's attached to the scheduler if the process is a top</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  level one, otherwise when it replaces its parent if the process is a</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  continuation.</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> * `void succeeded();`</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  It's invoked in case of success, immediately after an update and during the</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  same tick.</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> * `void failed();`</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> </div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  It's invoked in case of errors, immediately after an update and during the</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  same tick.</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> * `void aborted();`</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  It's invoked only if a process is explicitly aborted. There is no guarantee</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  that it executes in the same tick, this depends solely on whether the</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  process is aborted immediately or not.</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> Derived classes can also change the internal state of a process by invoking</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> `succeed` and `fail`, as well as `pause` and `unpause` the process itself. All</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> these are protected member functions made available to be able to manage the</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> life cycle of a process from a derived class.</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> Here is a minimal example for the sake of curiosity:</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> ```cpp</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> struct my_process: entt::process<my_process, std::uint32_t> {</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  using delta_type = std::uint32_t;</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>  void update(delta_type delta, void *) {</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  remaining -= std::min(remaining, delta);</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </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> </div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  if(!remaining) {</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  succeed();</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> </div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> private:</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  delta_type remaining{1000u};</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> };</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> ## Adaptor</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> Lambdas and functors can't be used directly with a scheduler for they are not</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> properly defined processes with managed life cycles.<br/></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> This class helps in filling the gap and turning lambdas and functors into</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> full featured processes usable by a scheduler.</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> </div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> The function call operator has a signature similar to the one of the `update`</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> function of a process but for the fact that it receives two extra arguments to</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> call whenever a process is terminated with success or with an error:</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> </div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> ```cpp</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> void(Delta delta, void *data, auto succeed, auto fail);</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> </div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> Parameters have the following meaning:</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> * `delta` is the elapsed time.</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> * `data` is an opaque pointer to user data if any, `nullptr` otherwise.</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> * `succeed` is a function to call when a process terminates with success.</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> * `fail` is a function to call when a process terminates with errors.</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> Both `succeed` and `fail` accept no parameters at all.</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> Note that usually users shouldn't worry about creating adaptors at all. A</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> scheduler creates them internally each and every time a lambda or a functor is</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> used as a process.</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> </div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> # The scheduler</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> </div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> A cooperative scheduler runs different processes and helps managing their life</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> cycles.</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> Each process is invoked once per tick. If it terminates, it's removed</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> automatically from the scheduler and it's never invoked again. Otherwise it's</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> a good candidate to run one more time the next tick.<br/></div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> A process can also have a child. In this case, the parent process is replaced</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> with its child when it terminates and only if it returns with success. In case</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> of errors, both the parent process and its child are discarded. This way, it's</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> easy to create chain of processes to run sequentially.</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> Using a scheduler is straightforward. To create it, users must provide only the</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span> type for the elapsed times and no arguments at all:</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> </div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> ```cpp</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span> entt::scheduler<std::uint32_t> scheduler;</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> ```</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> </div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> It has member functions to query its internal data structures, like `empty` or</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span> `size`, as well as a `clear` utility to reset it to a clean state:</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span> </div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> ```cpp</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> // checks if there are processes still running</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> const auto empty = scheduler.empty();</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> // gets the number of processes still running</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> entt::scheduler<std::uint32_t>::size_type size = scheduler.size();</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> // resets the scheduler to its initial state and discards all the processes</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span> scheduler.clear();</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span> ```</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> To attach a process to a scheduler there are mainly two ways:</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span> * If the process inherits from the `process` class template, it's enough to</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  indicate its type and submit all the parameters required to construct it to</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  the `attach` member function:</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span> </div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  ```cpp</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  scheduler.attach<my_process>("foobar");</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  ```</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span> </div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span> * Otherwise, in case of a lambda or a functor, it's enough to provide an</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  instance of the class to the `attach` member function:</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>  ```cpp</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  scheduler.attach([](auto...){ /* ... */ });</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  ```</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span> </div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span> In both cases, the return value is an opaque object that offers a `then` member</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span> function to use to create chains of processes to run sequentially.<br/></div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span> As a minimal example of use:</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> ```cpp</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span> // schedules a task in the form of a lambda function</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span> scheduler.attach([](auto delta, void *, auto succeed, auto fail) {</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> })</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span> // appends a child in the form of another lambda function</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span> .then([](auto delta, void *, auto succeed, auto fail) {</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  // ...</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span> })</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span> // appends a child in the form of a process class</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span> .then<my_process>();</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span> ```</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span> </div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span> To update a scheduler and therefore all its processes, the `update` member</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span> function is the way to go:</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span> </div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span> ```cpp</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span> // updates all the processes, no user data are provided</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span> scheduler.update(delta);</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span> </div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span> // updates all the processes and provides them with custom data</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span> scheduler.update(delta, &data);</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span> ```</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span> </div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span> In addition to these functions, the scheduler offers an `abort` member function</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span> that can be used to discard all the running processes at once:</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span> </div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span> ```cpp</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span> // aborts all the processes abruptly ...</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span> scheduler.abort(true);</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span> // ... or gracefully during the next tick</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span> scheduler.abort();</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span> ```</div></div><!-- fragment --></div><!-- contents -->
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