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      <h1 class="title">std/tasks</h1>
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  <li>
  <a class="reference reference-toplevel" href="#6" id="56">Imports</a>
</li>
<li>
  <details open>
    <summary><a class="reference reference-toplevel" href="#7" id="57">Types</a></summary>
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      <li><a class="reference" href="#Task" title="Task = object">Task</a></li>

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    <summary><a class="reference reference-toplevel" href="#12" id="62">Procs</a></summary>
    <ul class="simple simple-toc-section">
      <ul class="simple nested-toc-section">=copy
  <li><a class="reference" href="#%3Dcopy%2CTask%2CTask" title="`=copy`(x: var Task; y: Task)">`=copy`(x: var Task; y: Task)</a></li>

</ul>
<ul class="simple nested-toc-section">=destroy
  <li><a class="reference" href="#%3Ddestroy%2CTask" title="`=destroy`(t: Task)">`=destroy`(t: Task)</a></li>

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<ul class="simple nested-toc-section">invoke
  <li><a class="reference" href="#invoke%2CTask%2Cpointer" title="invoke(task: Task; res: pointer = nil)">invoke(task: Task; res: pointer = nil)</a></li>

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    <summary><a class="reference reference-toplevel" href="#17" id="67">Macros</a></summary>
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      <ul class="simple nested-toc-section">toTask
  <li><a class="reference" href="#toTask.m" title="toTask(e: typed{nkCall | nkInfix | nkPrefix | nkPostfix | nkCommand |
    nkCallStrLit}): Task">toTask(e: typed{nkCall | nkInfix | nkPrefix | nkPostfix | nkCommand |
    nkCallStrLit}): Task</a></li>

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  </div>
  <div class="nine columns" id="content">
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/tasks.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/tasks.nim#L1" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

    <div id="tocRoot"></div>
    
    <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.
<p><strong class="examples_text">Example:</strong></p>
<pre class="listing"><span class="Keyword">import</span> <span class="Identifier">std</span><span class="Operator">/</span><span class="Identifier">tasks</span>
<span class="Keyword">block</span><span class="Punctuation">:</span>
  <span class="Keyword">var</span> <span class="Identifier">num</span> <span class="Operator">=</span> <span class="DecNumber">0</span>
  <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>

  <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>
  <span class="Identifier">b</span><span class="Operator">.</span><span class="Identifier">invoke</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
  <span class="Identifier">assert</span> <span class="Identifier">num</span> <span class="Operator">==</span> <span class="DecNumber">13</span>
  <span class="Comment"># A task can be invoked multiple times</span>
  <span class="Identifier">b</span><span class="Operator">.</span><span class="Identifier">invoke</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
  <span class="Identifier">assert</span> <span class="Identifier">num</span> <span class="Operator">==</span> <span class="DecNumber">26</span>

<span class="Keyword">block</span><span class="Punctuation">:</span>
  <span class="Keyword">type</span>
    <span class="Identifier">Runnable</span> <span class="Operator">=</span> <span class="Keyword">ref</span> <span class="Keyword">object</span>
      <span class="Identifier">data</span><span class="Punctuation">:</span> <span class="Identifier">int</span>

  <span class="Keyword">var</span> <span class="Identifier">data</span><span class="Punctuation">:</span> <span class="Identifier">int</span>
  <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>
    <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">data</span> <span class="Operator">+=</span> <span class="DecNumber">2</span>
    <span class="Identifier">data</span> <span class="Operator">=</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">data</span>


  <span class="Keyword">when</span> <span class="Identifier">false</span><span class="Punctuation">:</span>
    <span class="Comment"># the parameters of call must be isolated.</span>
    <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>
    <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>
    <span class="Identifier">b</span><span class="Operator">.</span><span class="Identifier">invoke</span><span class="Punctuation">(</span><span class="Punctuation">)</span>

  <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>
  <span class="Identifier">b</span><span class="Operator">.</span><span class="Identifier">invoke</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
  <span class="Identifier">assert</span> <span class="Identifier">data</span> <span class="Operator">==</span> <span class="DecNumber">14</span>
  <span class="Identifier">b</span><span class="Operator">.</span><span class="Identifier">invoke</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
  <span class="Identifier">assert</span> <span class="Identifier">data</span> <span class="Operator">==</span> <span class="DecNumber">16</span></pre></p>
    <div class="section" id="6">
  <h1><a class="toc-backref" href="#6">Imports</a></h1>
  <dl class="item">
    <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>
  </dl>
</div>
<div class="section" id="7">
  <h1><a class="toc-backref" href="#7">Types</a></h1>
  <dl class="item">
    <div id="Task">
  <dt><pre><a href="tasks.html#Task"><span class="Identifier">Task</span></a> <span class="Other">=</span> <span class="Keyword">object</span></pre></dt>
  <dd>
    
    <tt class="docutils literal"><span class="pre"><span class="Identifier">Task</span></span></tt> contains the callback and its arguments.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/tasks.nim#L63" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/tasks.nim#L63" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

  </dl>
</div>
<div class="section" id="12">
  <h1><a class="toc-backref" href="#12">Procs</a></h1>
  <dl class="item">
    <div id="=copy-procs-all">
  <div id="=copy,Task,Task">
  <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>
  <dd>
    
    
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/tasks.nim#L69" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/tasks.nim#L69" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="=destroy-procs-all">
  <div id="=destroy,Task">
  <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>
                           <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
  <dd>
    
    Frees the resources allocated for a <tt class="docutils literal"><span class="pre"><span class="Identifier">Task</span></span></tt>.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/tasks.nim#L73" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/tasks.nim#L73" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>
<div id="invoke-procs-all">
  <div id="invoke,Task,pointer">
  <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>
    <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>
  <dd>
    
    Invokes the <tt class="docutils literal"><span class="pre"><span class="Identifier">task</span></span></tt>.
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/tasks.nim#L87" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/tasks.nim#L87" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

</div>

  </dl>
</div>
<div class="section" id="17">
  <h1><a class="toc-backref" href="#17">Macros</a></h1>
  <dl class="item">
    <div id="toTask-macros-all">
  <div id="toTask.m">
  <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>
    <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>
  <dd>
    
    Converts the call and its arguments to <tt class="docutils literal"><span class="pre"><span class="Identifier">Task</span></span></tt>.
<p><strong class="examples_text">Example:</strong></p>
<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>

<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>
<span class="Identifier">assert</span> <span class="Identifier">b</span> <span class="Keyword">is</span> <span class="Identifier">Task</span></pre>
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/tasks.nim#L126" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/tasks.nim#L126" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

  </dd>
</div>

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