From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: Atomics.notify()
+slug: Web/JavaScript/Reference/Global_Objects/Atomics/notify
+tags:
+  - Atomics
+  - JavaScript
+  - Method
+  - Shared Memory
+translation_of: Web/JavaScript/Reference/Global_Objects/Atomics/notify
+---
+<div>{{JSRef}}</div>
+
+<p>静态方法 <code><strong>Atomics</strong></code><strong><code>.notify()</code></strong> 提醒一些在等待队列中休眠的代理。</p>
+
+<div class="note">
+<p><strong>注意：</strong>本操作仅在共享的 {{jsxref("Int32Array")}} 下可用。</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate">Atomics.notify(typedArray, index, count)
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>typedArray</code></dt>
+ <dd>一个共享的 {{jsxref("Int32Array")}}。</dd>
+ <dt><code>index</code></dt>
+ <dd><code>typedArray</code> 中要唤醒的目标索引。</dd>
+ <dt><code>count</code></dt>
+ <dd>要通知的正在休眠的代理的数量。默认是 {{jsxref("Infinity", "+Infinity")}}。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>被唤醒的代理的数量。</p>
+
+<h3 id="异常">异常</h3>
+
+<ul>
+ <li>若 <code>typedArray</code> 不是共享的 {{jsxref("Int32Array")}}，则抛出一个 {{jsxref("TypeError")}} 异常。</li>
+ <li>若 <code>index</code> 索引超出了 <code>typedArray</code> 的大小，则抛出一个 {{jsxref("RangeError")}} 异常。</li>
+</ul>
+
+<h2 id="示例">示例</h2>
+
+<p>分配一个共享的 <code>Int32Array</code>：</p>
+
+<pre class="brush: js notranslate">var sab = new SharedArrayBuffer(1024);
+var int32 = new Int32Array(sab);
+</pre>
+
+<p>一个读线程会进入休眠并监视索引0处的值（默认为0）。只要索引0处的值不为0，读进程就会唤醒。但是，一旦写进程存储了一个新的值，写进程就会产生一个提醒并返回写入后的新值（123）。（这里示例有问题或者说对初学者不友好，如果直接在浏览器控制台运行下面代码会报错，因为我们不能尝试睡眠主线程，可以见 <a href="https://github.com/lizhongzhen11/lizz-blog/issues/125#notice">重学js —— 结构化数据之Atomics对象</a>，同时我在 <strong>codepen </strong>写了一个示例：<a href="https://codepen.io/lizhongzhen11/project/editor/AmzyaY#">Atomics.wait使用示例</a>）</p>
+
+<pre class="brush: js notranslate">Atomics.wait(int32, 0, 0);
+console.log(int32[0]); // 123</pre>
+
+<p>写进程写入一个新值并告知等待进程已经写入成功了：</p>
+
+<pre class="brush: js notranslate">console.log(int32[0]); // 0;
+Atomics.store(int32, 0, 123);
+Atomics.notify(int32, 0, 1);</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">注释</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-atomics.notify', 'Atomics.notify')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td>Initial definition in ES2017.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.builtins.Atomics.notify")}}</p>
+
+<h2 id="相关文档">相关文档</h2>
+
+<ul>
+ <li>{{jsxref("Atomics")}}</li>
+ <li>{{jsxref("Atomics.wait()")}}</li>
+</ul>
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