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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `tick` fn in crate `chan`."><meta name="keywords" content="rust, rustlang, rust-lang, tick"><title>chan::tick - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script></head><body class="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><div class="sidebar-elems"><p class='location'><a href='index.html'>chan</a></p><script>window.sidebarCurrent = {name: 'tick', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='in-band'>Function <a href='index.html'>chan</a>::<wbr><a class="fn" href=''>tick</a></span><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../src/chan/lib.rs.html#619-637' title='goto source code'>[src]</a></span></h1><pre class='rust fn'>pub fn tick(duration: <a class="struct" href="https://doc.rust-lang.org/nightly/core/time/struct.Duration.html" title="struct core::time::Duration">Duration</a>) -> <a class="struct" href="../chan/struct.Receiver.html" title="struct chan::Receiver">Receiver</a><<a class="struct" href="../chan/struct.Sender.html" title="struct chan::Sender">Sender</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>>></pre><div class='docblock'><p>Creates a new rendezvous channel that is "ticked" every duration.</p>
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<p>When <code>duration</code> is <code>0</code>, no ticks are ever sent.</p>
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<p>When <code>duration</code> is non-zero, then a new channel is created and sent at
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every duration. When the sent channel is dropped, the timer is reset
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and the process repeats after the duration.</p>
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<p>This is especially convenient because it keeps the ticking in sync with
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the code that uses it. Namely, the ticks won't "build up."</p>
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<p>N.B. There is no way to reclaim the resources used by this function.
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If you stop receiving on the channel returned, then the thread spawned by
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<code>tick_ms</code> will block indefinitely.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<p>This is most useful when used in <code>chan_select!</code> because the received
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sentinel channel gets dropped only after the correspond arm has
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executed. At which point, the ticker is reset and waits to tick until
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<code>duration</code> milliseconds lapses <em>after</em> the <code>chan_select!</code> arm is executed.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::<span class="ident">Duration</span>;
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<span class="kw">let</span> <span class="ident">tick</span> <span class="op">=</span> <span class="ident">chan</span>::<span class="ident">tick</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">100</span>));
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<span class="kw">let</span> <span class="ident">boom</span> <span class="op">=</span> <span class="ident">chan</span>::<span class="ident">after</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">500</span>));
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<span class="kw">loop</span> {
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<span class="macro">chan_select</span><span class="macro">!</span> {
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<span class="ident">default</span> <span class="op">=></span> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">" ."</span>);
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<span class="ident">thread</span>::<span class="ident">sleep</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">50</span>));
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},
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<span class="ident">tick</span>.<span class="ident">recv</span>() <span class="op">=></span> <span class="macro">println</span><span class="macro">!</span>(<span class="string">"tick."</span>),
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<span class="ident">boom</span>.<span class="ident">recv</span>() <span class="op">=></span> { <span class="macro">println</span><span class="macro">!</span>(<span class="string">"BOOM!"</span>); <span class="kw">return</span>; },
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}
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}</pre>
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