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  23. <h1 class="title">std/tasks</h1>
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  48. <ul class="simple simple-toc" id="toc-list">
  49. <li>
  50. <a class="reference reference-toplevel" href="#6" id="56">Imports</a>
  51. </li>
  52. <li>
  53. <details open>
  54. <summary><a class="reference reference-toplevel" href="#7" id="57">Types</a></summary>
  55. <ul class="simple simple-toc-section">
  56. <li><a class="reference" href="#Task" title="Task = object">Task</a></li>
  57. </ul>
  58. </details>
  59. </li>
  60. <li>
  61. <details open>
  62. <summary><a class="reference reference-toplevel" href="#12" id="62">Procs</a></summary>
  63. <ul class="simple simple-toc-section">
  64. <ul class="simple nested-toc-section">=copy
  65. <li><a class="reference" href="#%3Dcopy%2CTask%2CTask" title="`=copy`(x: var Task; y: Task)">`=copy`(x: var Task; y: Task)</a></li>
  66. </ul>
  67. <ul class="simple nested-toc-section">=destroy
  68. <li><a class="reference" href="#%3Ddestroy%2CTask" title="`=destroy`(t: Task)">`=destroy`(t: Task)</a></li>
  69. </ul>
  70. <ul class="simple nested-toc-section">invoke
  71. <li><a class="reference" href="#invoke%2CTask%2Cpointer" title="invoke(task: Task; res: pointer = nil)">invoke(task: Task; res: pointer = nil)</a></li>
  72. </ul>
  73. </ul>
  74. </details>
  75. </li>
  76. <li>
  77. <details open>
  78. <summary><a class="reference reference-toplevel" href="#17" id="67">Macros</a></summary>
  79. <ul class="simple simple-toc-section">
  80. <ul class="simple nested-toc-section">toTask
  81. <li><a class="reference" href="#toTask.m" title="toTask(e: typed{nkCall | nkInfix | nkPrefix | nkPostfix | nkCommand |
  82. nkCallStrLit}): Task">toTask(e: typed{nkCall | nkInfix | nkPrefix | nkPostfix | nkCommand |
  83. nkCallStrLit}): Task</a></li>
  84. </ul>
  85. </ul>
  86. </details>
  87. </li>
  88. <li>
  89. <a class="reference reference-toplevel" href="#19" id="69">Exports</a>
  90. </li>
  91. </ul>
  92. </div>
  93. <div class="nine columns" id="content">
  94. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/tasks.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  95. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/tasks.nim#L1" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  96. <div id="tocRoot"></div>
  97. <p class="module-desc">This module provides basic primitives for creating parallel programs. A <tt class="docutils literal"><span class="pre"><span class="Identifier">Task</span></span></tt> should be only owned by a single Thread, it cannot be shared by threads.
  98. <p><strong class="examples_text">Example:</strong></p>
  99. <pre class="listing"><span class="Keyword">import</span> <span class="Identifier">std</span><span class="Operator">/</span><span class="Identifier">tasks</span>
  100. <span class="Keyword">block</span><span class="Punctuation">:</span>
  101. <span class="Keyword">var</span> <span class="Identifier">num</span> <span class="Operator">=</span> <span class="DecNumber">0</span>
  102. <span class="Keyword">proc</span> <span class="Identifier">hello</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">:</span> <span class="Identifier">int</span><span class="Punctuation">)</span> <span class="Operator">=</span> <span class="Identifier">inc</span> <span class="Identifier">num</span><span class="Punctuation">,</span> <span class="Identifier">a</span>
  103. <span class="Keyword">let</span> <span class="Identifier">b</span> <span class="Operator">=</span> <span class="Identifier">toTask</span> <span class="Identifier">hello</span><span class="Punctuation">(</span><span class="DecNumber">13</span><span class="Punctuation">)</span>
  104. <span class="Identifier">b</span><span class="Operator">.</span><span class="Identifier">invoke</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
  105. <span class="Identifier">assert</span> <span class="Identifier">num</span> <span class="Operator">==</span> <span class="DecNumber">13</span>
  106. <span class="Comment"># A task can be invoked multiple times</span>
  107. <span class="Identifier">b</span><span class="Operator">.</span><span class="Identifier">invoke</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
  108. <span class="Identifier">assert</span> <span class="Identifier">num</span> <span class="Operator">==</span> <span class="DecNumber">26</span>
  109. <span class="Keyword">block</span><span class="Punctuation">:</span>
  110. <span class="Keyword">type</span>
  111. <span class="Identifier">Runnable</span> <span class="Operator">=</span> <span class="Keyword">ref</span> <span class="Keyword">object</span>
  112. <span class="Identifier">data</span><span class="Punctuation">:</span> <span class="Identifier">int</span>
  113. <span class="Keyword">var</span> <span class="Identifier">data</span><span class="Punctuation">:</span> <span class="Identifier">int</span>
  114. <span class="Keyword">proc</span> <span class="Identifier">hello</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">:</span> <span class="Identifier">Runnable</span><span class="Punctuation">)</span> <span class="Punctuation">{</span><span class="Operator">.</span><span class="Identifier">nimcall</span><span class="Operator">.</span><span class="Punctuation">}</span> <span class="Operator">=</span>
  115. <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">data</span> <span class="Operator">+=</span> <span class="DecNumber">2</span>
  116. <span class="Identifier">data</span> <span class="Operator">=</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">data</span>
  117. <span class="Keyword">when</span> <span class="Identifier">false</span><span class="Punctuation">:</span>
  118. <span class="Comment"># the parameters of call must be isolated.</span>
  119. <span class="Keyword">let</span> <span class="Identifier">x</span> <span class="Operator">=</span> <span class="Identifier">Runnable</span><span class="Punctuation">(</span><span class="Identifier">data</span><span class="Punctuation">:</span> <span class="DecNumber">12</span><span class="Punctuation">)</span>
  120. <span class="Keyword">let</span> <span class="Identifier">b</span> <span class="Operator">=</span> <span class="Identifier">toTask</span> <span class="Identifier">hello</span><span class="Punctuation">(</span><span class="Identifier">x</span><span class="Punctuation">)</span> <span class="Comment"># error ----&gt; expression cannot be isolated: x</span>
  121. <span class="Identifier">b</span><span class="Operator">.</span><span class="Identifier">invoke</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
  122. <span class="Keyword">let</span> <span class="Identifier">b</span> <span class="Operator">=</span> <span class="Identifier">toTask</span><span class="Punctuation">(</span><span class="Identifier">hello</span><span class="Punctuation">(</span><span class="Identifier">Runnable</span><span class="Punctuation">(</span><span class="Identifier">data</span><span class="Punctuation">:</span> <span class="DecNumber">12</span><span class="Punctuation">)</span><span class="Punctuation">)</span><span class="Punctuation">)</span>
  123. <span class="Identifier">b</span><span class="Operator">.</span><span class="Identifier">invoke</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
  124. <span class="Identifier">assert</span> <span class="Identifier">data</span> <span class="Operator">==</span> <span class="DecNumber">14</span>
  125. <span class="Identifier">b</span><span class="Operator">.</span><span class="Identifier">invoke</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
  126. <span class="Identifier">assert</span> <span class="Identifier">data</span> <span class="Operator">==</span> <span class="DecNumber">16</span></pre></p>
  127. <div class="section" id="6">
  128. <h1><a class="toc-backref" href="#6">Imports</a></h1>
  129. <dl class="item">
  130. <a class="reference external" href="macros.html">macros</a>, <a class="reference external" href="isolation.html">isolation</a>, <a class="reference external" href="typetraits.html">typetraits</a>, <a class="reference external" href="assertions.html">assertions</a>, <a class="reference external" href="effecttraits.html">effecttraits</a>
  131. </dl>
  132. </div>
  133. <div class="section" id="7">
  134. <h1><a class="toc-backref" href="#7">Types</a></h1>
  135. <dl class="item">
  136. <div id="Task">
  137. <dt><pre><a href="tasks.html#Task"><span class="Identifier">Task</span></a> <span class="Other">=</span> <span class="Keyword">object</span></pre></dt>
  138. <dd>
  139. <tt class="docutils literal"><span class="pre"><span class="Identifier">Task</span></span></tt> contains the callback and its arguments.
  140. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/tasks.nim#L63" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  141. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/tasks.nim#L63" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  142. </dd>
  143. </div>
  144. </dl>
  145. </div>
  146. <div class="section" id="12">
  147. <h1><a class="toc-backref" href="#12">Procs</a></h1>
  148. <dl class="item">
  149. <div id="=copy-procs-all">
  150. <div id="=copy,Task,Task">
  151. <dt><pre><span class="Keyword">proc</span> <a href="#%3Dcopy%2CTask%2CTask"><span class="Identifier">`=copy`</span></a><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="tasks.html#Task"><span class="Identifier">Task</span></a><span class="Other">;</span> <span class="Identifier">y</span><span class="Other">:</span> <a href="tasks.html#Task"><span class="Identifier">Task</span></a><span class="Other">)</span> {.<span class="Identifier">error</span>.}</pre></dt>
  152. <dd>
  153. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/tasks.nim#L69" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  154. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/tasks.nim#L69" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  155. </dd>
  156. </div>
  157. </div>
  158. <div id="=destroy-procs-all">
  159. <div id="=destroy,Task">
  160. <dt><pre><span class="Keyword">proc</span> <a href="#%3Ddestroy%2CTask"><span class="Identifier">`=destroy`</span></a><span class="Other">(</span><span class="Identifier">t</span><span class="Other">:</span> <a href="tasks.html#Task"><span class="Identifier">Task</span></a><span class="Other">)</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">gcsafe</span><span class="Other">,</span> <span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">RootEffect</span><span class="Other">]</span><span class="Other">,</span>
  161. <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  162. <dd>
  163. Frees the resources allocated for a <tt class="docutils literal"><span class="pre"><span class="Identifier">Task</span></span></tt>.
  164. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/tasks.nim#L73" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  165. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/tasks.nim#L73" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  166. </dd>
  167. </div>
  168. </div>
  169. <div id="invoke-procs-all">
  170. <div id="invoke,Task,pointer">
  171. <dt><pre><span class="Keyword">proc</span> <a href="#invoke%2CTask%2Cpointer"><span class="Identifier">invoke</span></a><span class="Other">(</span><span class="Identifier">task</span><span class="Other">:</span> <a href="tasks.html#Task"><span class="Identifier">Task</span></a><span class="Other">;</span> <span class="Identifier">res</span><span class="Other">:</span> <a href="system.html#pointer"><span class="Identifier">pointer</span></a> <span class="Other">=</span> <span class="Keyword">nil</span><span class="Other">)</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">gcsafe</span><span class="Other">,</span>
  172. <span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">Exception</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">RootEffect</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  173. <dd>
  174. Invokes the <tt class="docutils literal"><span class="pre"><span class="Identifier">task</span></span></tt>.
  175. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/tasks.nim#L87" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
  176. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/tasks.nim#L87" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
  177. </dd>
  178. </div>
  179. </div>
  180. </dl>
  181. </div>
  182. <div class="section" id="17">
  183. <h1><a class="toc-backref" href="#17">Macros</a></h1>
  184. <dl class="item">
  185. <div id="toTask-macros-all">
  186. <div id="toTask.m">
  187. <dt><pre><span class="Keyword">macro</span> <a href="#toTask.m"><span class="Identifier">toTask</span></a><span class="Other">(</span><span class="Identifier">e</span><span class="Other">:</span> <a href="system.html#typed"><span class="Identifier">typed</span></a><span class="Other">{</span><span class="Identifier">nkCall</span> <span class="Operator">|</span> <span class="Identifier">nkInfix</span> <span class="Operator">|</span> <span class="Identifier">nkPrefix</span> <span class="Operator">|</span> <span class="Identifier">nkPostfix</span> <span class="Operator">|</span> <span class="Identifier">nkCommand</span> <span class="Operator">|</span>
  188. <span class="Identifier">nkCallStrLit</span><span class="Other">}</span><span class="Other">)</span><span class="Other">:</span> <a href="tasks.html#Task"><span class="Identifier">Task</span></a></pre></dt>
  189. <dd>
  190. Converts the call and its arguments to <tt class="docutils literal"><span class="pre"><span class="Identifier">Task</span></span></tt>.
  191. <p><strong class="examples_text">Example:</strong></p>
  192. <pre class="listing"><span class="Keyword">proc</span> <span class="Identifier">hello</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">:</span> <span class="Identifier">int</span><span class="Punctuation">)</span> <span class="Operator">=</span> <span class="Identifier">echo</span> <span class="Identifier">a</span>
  193. <span class="Keyword">let</span> <span class="Identifier">b</span> <span class="Operator">=</span> <span class="Identifier">toTask</span> <span class="Identifier">hello</span><span class="Punctuation">(</span><span class="DecNumber">13</span><span class="Punctuation">)</span>
  194. <span class="Identifier">assert</span> <span class="Identifier">b</span> <span class="Keyword">is</span> <span class="Identifier">Task</span></pre>
  195. <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/tasks.nim#L126" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
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