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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Predeclared in CONCURRENCY</title>
<link rel="shortcut icon"
type="image/x-icon"
href="/images/sourcepower.ico" />
<script src="scripts/prettify/prettify.js"> </script>
<script src="scripts/prettify/lang-css.js"> </script>
<!--[if lt IE 9]>
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css">
<link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css">
</head>
<body>
<div id="main">
<h1 class="page-title">Predeclared in <a href=".">CONCURRENCY</a></h1>
<!-- changed by MH on 1/7/2019 from default template. See "MH" below -->
<!-- changed by MH on 3/6/2021 from default template. See "MH" below -->
<section>
<header>
<h2></h2>
</header>
<article>
<div class="container-overview">
<dl class="details">
</dl>
</div>
<h3 class="subsection-title">Functions</h3> <!-- changed by MH on 1/7/2019, was Methods -->
<div class="function-entry">
<h4 class="name" id="clear"><span class="type-signature"></span>clear<span class="signature">(p)</span><span class="type-signature"> → {undefined}</span></h4>
<div class="description">
Sets the head of pair <CODE>p</CODE> to
<CODE>false</CODE>. Returns <CODE>undefined</CODE>.
This is an atomic operation.
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>p</code></td>
<td class="type">
<span class="param-type">array</span>
</td>
<td class="description last">given pair</td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
<h5>Returns:</h5>
<div class="param-desc">
undefined
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">undefined</span>
</dd>
</dl>
</div>
<div class="function-entry">
<h4 class="name" id="concurrent_execute"><span class="type-signature"></span>concurrent_execute<span class="signature">()</span><span class="type-signature"> → {undefined}</span></h4>
<div class="description">
Setup multiple threads for concurrent execution. For each
function <CODE>f_i</CODE>,
setup a thread <CODE>t_i</CODE> that executes the body of
<CODE>f_i</CODE>. Any parameters of <CODE>f_i</CODE> refer
to <CODE>undefined</CODE> during execution.
The thread that called <CODE>concurrent_execute</CODE>
runs concurrently with all <CODE>t_i</CODE>. Returns
<CODE>undefined</CODE>. This is an atomic operation.
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>f_1,f_2,...,f_n</code></td>
<td class="type">
<span class="param-type">function</span>
</td>
<td class="description last">given functions</td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
<h5>Returns:</h5>
<div class="param-desc">
undefined
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">undefined</span>
</dd>
</dl>
</div>
<div class="function-entry">
<h4 class="name" id="test_and_set"><span class="type-signature"></span>test_and_set<span class="signature">(p)</span><span class="type-signature"> → {value}</span></h4>
<div class="description">
Assumes the head of pair <CODE>p</CODE> is a boolean
<CODE>b</CODE>. Sets the head of <CODE>p</CODE> to
<CODE>true</CODE>. Returns <CODE>b</CODE>. This is an
atomic operation.
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>p</code></td>
<td class="type">
<span class="param-type">array</span>
</td>
<td class="description last">given pair</td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
<h5>Returns:</h5>
<div class="param-desc">
- head of pair <CODE>b</CODE>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">value</span>
</dd>
</dl>
</div>
</article>
</section>
</div>
<nav>
<h3>Predeclared names</h3><ul><li><a href="global.html#clear">clear</a></li><li><a href="global.html#concurrent_execute">concurrent_execute</a></li><li><a href="global.html#test_and_set">test_and_set</a></li></ul>
</nav>
<br class="clear">
<footer>
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<a href="https://github.com/source-academy/js-slang">Github repository js-slang</a>
on Wed Apr 02 2025 06:57:59 GMT+0000 (Coordinated Universal Time)
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