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      切换调度器
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  <h1>切换线程</h1>

<p>所有<code>scopeXX</code>作用域内为主线程, 可直接更新视图</p>
<div class="admonition question">
<p class="admonition-title">调度器</p>
<p>协程中的调度器实际上为线程池, 通过切换调度器可以切换到不同线程上</p>
</div>
<h2 id="_1">切换调度器<a class="headerlink" href="#_1" title="Permanent link">&para;</a></h2>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="n">scopeNetLife</span><span class="p">(</span><span class="n">dispatcher</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Dispatchers</span><span class="p">.</span><span class="na">IO</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="w">    </span><span class="n">tv</span><span class="p">.</span><span class="na">text</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Get</span><span class="o">&lt;</span><span class="kt">String</span><span class="o">&gt;</span><span class="p">(</span><span class="n">Api</span><span class="p">.</span><span class="na">PATH</span><span class="p">).</span><span class="na">await</span><span class="p">()</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="p">}</span>
</span></code></pre></div>
<div class="admonition failure">
<p class="admonition-title">禁止的调度器</p>
<p><code>Dispatchers.Main.immediate</code>会立即同步执行, 导致<code>catch/finally</code>函数无效</p>
</div>
<h2 id="_2">作用域内部切换<a class="headerlink" href="#_2" title="Permanent link">&para;</a></h2>
<p>有时需开启新的线程处理耗时任务</p>
<div class="tabbed-set tabbed-alternate" data-tabs="1:2"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><input id="__tabbed_1_2" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">主线程作用域内切换子线程</label><label for="__tabbed_1_2">子线程作用域内切换主线程</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="n">scopeNetLife</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="hll"><span class="w">    </span><span class="n">tv</span><span class="p">.</span><span class="na">text</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">withIO</span><span class="w"> </span><span class="p">{</span>
</span></span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="w">        </span><span class="c1">// 假设此处是一个IO读写阻塞任务</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="s">&quot;读出结果&quot;</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w">    </span><span class="p">}</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="p">}</span>
</span></code></pre></div>
</div>
<div class="tabbed-block">
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="n">scopeNetLife</span><span class="p">(</span><span class="n">dispatcher</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Dispatchers</span><span class="p">.</span><span class="na">IO</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="hll"><span class="w">    </span><span class="n">tv</span><span class="p">.</span><span class="na">text</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">withMain</span><span class="w"> </span><span class="p">{</span>
</span></span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="w">        </span><span class="c1">// 假设此处是一个IO读写阻塞任务</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="s">&quot;读出结果&quot;</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w">    </span><span class="p">}</span>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="p">}</span>
</span></code></pre></div>
</div>
</div>
</div>
<table>
<thead>
<tr>
<th>函数</th>
<th>描述</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="api/-net/com.drake.net.utils/with-main.html">withMain</a></td>
<td>切换到主线程</td>
</tr>
<tr>
<td><a href="api/-net/com.drake.net.utils/with-i-o.html">withIO</a></td>
<td>切换到IO线程</td>
</tr>
<tr>
<td><a href="api/-net/com.drake.net.utils/with-default.html">withDefault</a></td>
<td>切换到子线程</td>
</tr>
<tr>
<td><a href="api/-net/com.drake.net.utils/with-unconfined.html">withUnconfined</a></td>
<td>切换到无限制调度器, 其取决于上一个执行的线程切换</td>
</tr>
<tr>
<td>launch</td>
<td>无返回值的挂起函数, 可指定线程</td>
</tr>
<tr>
<td>async</td>
<td>有返回值的挂起函数, 通过<code>await()</code>返回值, 可指定线程</td>
</tr>
<tr>
<td><a href="api/-net/com.drake.net.utils/with-unconfined.html">runMain</a></td>
<td>切换到主线程, 该函数不属于协程可以在任何地方调用</td>
</tr>
</tbody>
</table>
<ul>
<li><code>withXX()</code> 协程阻塞挂起</li>
<li><code>launch()/async()</code> 非阻塞执行, 两者区别是有无返回值</li>
</ul>


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