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channel-buffering.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example 中文版: 通道缓冲</title>
<link rel=stylesheet href="site.css">
</head>
<script>
onkeydown = (e) => {
if (e.key == "ArrowLeft") {
window.location.href = 'channels';
}
if (e.key == "ArrowRight") {
window.location.href = 'channel-synchronization';
}
}
</script>
<body>
<div class="example" id="channel-buffering">
<h2><a href="./">Go by Example 中文版</a>: 通道缓冲</h2>
<table>
<tr>
<td class="docs">
<p>默认情况下，通道是 <em>无缓冲</em> 的，这意味着只有对应的接收（<code><- chan</code>）
通道准备好接收时，才允许进行发送（<code>chan <-</code>）。
<em>有缓冲通道</em> 允许在没有对应接收者的情况下，缓存一定数量的值。</p>
</td>
<td class="code empty leading">
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<a href="https://play.studygolang.com/p/TU-qtO46hhV"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<pre class="chroma"><span class="kn">package</span> <span class="nx">main</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kn">import</span> <span class="s">"fmt"</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kd">func</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>这里我们 <code>make</code> 了一个字符串通道，最多允许缓存 2 个值。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">messages</span> <span class="o">:=</span> <span class="nb">make</span><span class="p">(</span><span class="kd">chan</span> <span class="kt">string</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>由于此通道是有缓冲的，
因此我们可以将这些值发送到通道中，而无需并发的接收。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">messages</span> <span class="o"><-</span> <span class="s">"buffered"</span>
<span class="nx">messages</span> <span class="o"><-</span> <span class="s">"channel"</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>然后我们可以正常接收这两个值。</p>
</td>
<td class="code">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="o"><-</span><span class="nx">messages</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="o"><-</span><span class="nx">messages</span><span class="p">)</span>
<span class="p">}</span>
</pre>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
</td>
<td class="code">
<pre class="chroma"><span class="gp">$</span> go run channel-buffering.go
<span class="go">buffered
</span><span class="go">channel</span></pre>
</td>
</tr>
</table>
<p class="next">
下一个例子: <a href="channel-synchronization.html">通道同步</a>
</p>
<p class="footer">
<a href="https://twitter.com/mmcgrana">@mmcgrana</a> 和<a href="https://eli.thegreenplace.net">Eli Bendersky</a>编写 | <a href="https://github.com/gobyexample-cn">gobyexample-cn</a> 翻译 | <a href="https://github.com/gobyexample-cn/gobyexample/issues">反馈</a> | <a href="https://github.com/gobyexample-cn/gobyexample">源码</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a> </p>
</p>
</div>
<script>
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codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import \"fmt\"\u000A');codeLines.push('func main() {\u000A');codeLines.push(' messages :\u003D make(chan string, 2)\u000A');codeLines.push(' messages \u003C- \"buffered\"\u000A messages \u003C- \"channel\"\u000A');codeLines.push(' fmt.Println(\u003C-messages)\u000A fmt.Println(\u003C-messages)\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>
</html>