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<title>11. yloop — BL602 IoT SDK release_bl_iot_sdk_1.6.11-1-g66bb28da 文档</title>
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<li class="toctree-l1"><a class="reference internal" href="../../../Examples/demo_protocols_http/http.html">6. Http client</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../../Examples/demo_protocols_httpc/httpc.html">7. Httpc client</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../../Examples/sdk_app_easyflash_boottimes/easyflash_boottimes.html">16. Easyflash4 boot times</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../arch.html">1. arch</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../bloop/bloop.html">5. BLOOP</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">11. yloop</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#id1">11.1. Yloop概要</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#id2">11.2. Yloop上下文</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#id3">11.3. Yloop调度</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#id4">11.4. Yloop实现原理</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#api">11.5. 主要api介绍</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#id5">11.6. 示例代码</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="#id6">11.6.1. 事件注册、通知、回调、取消流程</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#poll">11.6.2. poll事件的注册取消</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#action">11.6.3. 延迟执行一个action</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#id7">11.6.4. 安排一次回调</a></li>
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</ul>
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</li>
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<li class="toctree-l2"><a class="reference internal" href="#id8">11.7. 注意事项</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="../../Network/httpc/httpc.html">12. HTTPC</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../Network/https/https.html">13. HTTPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../Network/tls/tls.html">14. TLS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../BLE/provision_WiFi/provision_WiFi.html">15. Provision_WiFi</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../BLE/mesh/mesh.html">16. Mesh</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../BLE/ble_stack/ble_stack.html">17. BLE</a></li>
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</ul>
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<p class="caption"><span class="caption-text">API</span></p>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../../../API/sys/cronalarms.html">1. cronalarms</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../../API/wifi/wifi_mgmr.html">2. Wi-Fi Manager</a></li>
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<li><a href="../../../index.html" class="icon icon-home"></a> »</li>
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<li><span class="section-number">11. </span>yloop</li>
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<a href="../../../_sources/Components/Middleware/yloop/yloop.rst.txt" rel="nofollow"> 查看页面源码</a>
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<div itemprop="articleBody">
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<div class="section" id="yloop">
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<h1><span class="section-number">11. </span>yloop<a class="headerlink" href="#yloop" title="永久链接至标题">¶</a></h1>
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<hr class="docutils" />
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<ul class="simple">
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<li><p><a class="reference internal" href="#id1">Yloop概要</a></p></li>
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<li><p><a class="reference internal" href="#id2">Yloop上下文</a></p></li>
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<li><p><a class="reference internal" href="#id3">Yloop调度</a></p></li>
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<li><p><a class="reference internal" href="#id4">Yloop实现原理</a></p></li>
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<li><p><a class="reference internal" href="#api">主要api介绍</a></p></li>
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<li><p><a class="reference internal" href="#id5">示例代码</a></p></li>
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<li><p><a class="reference internal" href="#id8">注意事项</a></p></li>
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</ul>
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<div class="section" id="id1">
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<h2><span class="section-number">11.1. </span>Yloop概要<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
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<p>Yloop 是AliOS
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Things的异步事件框架。Yloop借鉴了，libuv及嵌入式业界常见的event
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loop，综合考虑使用复杂性，性能，及footprint，实现了一个适合于MCU的事件调度机制。我们移植了相关的插件。其主要优势是所有的处理都是在主任务中执行的，不需要额外的创建任务，从而节省内存使用。同时，由于所有处理都是在主任务进行，不需要复杂的互斥操作。</p>
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</div>
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<div class="section" id="id2">
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<h2><span class="section-number">11.2. </span>Yloop上下文<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<p>每个Yloop实例（aos_loop_t）与特定的任务上下文绑定，AliOS
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Things的程序入口application_start
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所在的上下文与系统的主Yloop实例绑定，该上下文也称为主任务。主任务以外的任务也可以创建自己的Yloop实例。</p>
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</div>
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<div class="section" id="id3">
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<h2><span class="section-number">11.3. </span>Yloop调度<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
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<p>Yloop实现了对IO，timer，callback，event的统一调度管理：</p>
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<ul class="simple">
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<li><p><code class="docutils literal notranslate"><span class="pre">IO</span></code>：最常见的是Socket，也可以是AliOS Things的vfs管理的设备</p></li>
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<li><p><code class="docutils literal notranslate"><span class="pre">timer</span></code>：即常见的定时器</p></li>
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<li><p><code class="docutils literal notranslate"><span class="pre">callback</span></code>：特定的执行函数</p></li>
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<li><p><code class="docutils literal notranslate"><span class="pre">event</span></code>：包括系统事件，用户自定义事件
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当调用aos_loop_run后，当前任务将会等待上述的各类事件发生。</p></li>
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</ul>
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</div>
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<div class="section" id="id4">
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<h2><span class="section-number">11.4. </span>Yloop实现原理<a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h2>
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<p>Yloop利用协议栈的select接口实现了对IO及timer的调度。AliOS
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Things自带的协议栈又暴露一个特殊的eventfd接口，Yloop利用此接口把VFS的设备文件，和eventfd关联起来，实现了对整个系统的事件的统一调度。</p>
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</div>
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<div class="section" id="api">
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<h2><span class="section-number">11.5. </span>主要api介绍<a class="headerlink" href="#api" title="永久链接至标题">¶</a></h2>
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<ul class="simple">
|
|||
|
|
<li><p>注册事件监听函数</p></li>
|
|||
|
|
</ul>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cm">/**</span>
|
|||
|
|
<span class="cm"> * Register system event filter callback.</span>
|
|||
|
|
<span class="cm"> *</span>
|
|||
|
|
<span class="cm"> @param[in] type event type interested.</span>
|
|||
|
|
<span class="cm"> * @param[in] cb system event callback.</span>
|
|||
|
|
<span class="cm"> * @param[in] priv private data past to cb.</span>
|
|||
|
|
<span class="cm"> *</span>
|
|||
|
|
<span class="cm"> * @return the operation status, 0 is OK, others is error.</span>
|
|||
|
|
<span class="cm"> */</span>
|
|||
|
|
<span class="kt">int</span> <span class="nf">aos_register_event_filter</span><span class="p">(</span><span class="kt">uint16_t</span> <span class="n">type</span><span class="p">,</span> <span class="n">aos_event_cb</span> <span class="n">cb</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">priv</span><span class="p">);</span>
|
|||
|
|
|
|||
|
|
<span class="cm">/**</span>
|
|||
|
|
<span class="cm"> * Unregister native event callback.</span>
|
|||
|
|
<span class="cm"> *</span>
|
|||
|
|
<span class="cm"> * @param[in] type event type interested.</span>
|
|||
|
|
<span class="cm"> * @param[in] cb system event callback.</span>
|
|||
|
|
<span class="cm"> * @param[in] priv private data past to cb.</span>
|
|||
|
|
<span class="cm"> *</span>
|
|||
|
|
<span class="cm"> * @return the operation status, 0 is OK, others is error.</span>
|
|||
|
|
<span class="cm"> */</span>
|
|||
|
|
<span class="kt">int</span> <span class="nf">aos_unregister_event_filter</span><span class="p">(</span><span class="kt">uint16_t</span> <span class="n">type</span><span class="p">,</span> <span class="n">aos_event_cb</span> <span class="n">cb</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">priv</span><span class="p">);</span>
|
|||
|
|
</pre></div>
|
|||
|
|
</div>
|
|||
|
|
<ul class="simple">
|
|||
|
|
<li><p>发布一个 event</p></li>
|
|||
|
|
</ul>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cm">/**</span>
|
|||
|
|
<span class="cm"> * Post local event.</span>
|
|||
|
|
<span class="cm"> *</span>
|
|||
|
|
<span class="cm"> * @param[in] type event type.</span>
|
|||
|
|
<span class="cm"> * @param[in] code event code.</span>
|
|||
|
|
<span class="cm"> * @param[in] value event value.</span>
|
|||
|
|
<span class="cm"> *</span>
|
|||
|
|
<span class="cm"> * @return the operation status, 0 is OK,others is error.</span>
|
|||
|
|
<span class="cm"> */</span>
|
|||
|
|
<span class="kt">int</span> <span class="nf">aos_post_event</span><span class="p">(</span><span class="kt">uint16_t</span> <span class="n">type</span><span class="p">,</span> <span class="kt">uint16_t</span> <span class="n">code</span><span class="p">,</span> <span class="kt">unsigned</span> <span class="kt">long</span> <span class="n">value</span><span class="p">);</span>
|
|||
|
|
</pre></div>
|
|||
|
|
</div>
|
|||
|
|
<ul class="simple">
|
|||
|
|
<li><p>注册和取消一个 poll event</p></li>
|
|||
|
|
</ul>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cm">/**</span>
|
|||
|
|
<span class="cm"> * Register a poll event in main loop.</span>
|
|||
|
|
<span class="cm"> *</span>
|
|||
|
|
<span class="cm"> * @param[in] fd poll fd.</span>
|
|||
|
|
<span class="cm"> * @param[in] action action to be executed.</span>
|
|||
|
|
<span class="cm"> * @param[in] param private data past to action.</span>
|
|||
|
|
<span class="cm"> *</span>
|
|||
|
|
<span class="cm"> * @return the operation status, 0 is OK,others is error.</span>
|
|||
|
|
<span class="cm"> */</span>
|
|||
|
|
<span class="kt">int</span> <span class="nf">aos_poll_read_fd</span><span class="p">(</span><span class="kt">int</span> <span class="n">fd</span><span class="p">,</span> <span class="n">aos_poll_call_t</span> <span class="n">action</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">param</span><span class="p">);</span>
|
|||
|
|
|
|||
|
|
<span class="cm">/**</span>
|
|||
|
|
<span class="cm"> * Cancel a poll event to be executed in main loop.</span>
|
|||
|
|
<span class="cm"> *</span>
|
|||
|
|
<span class="cm"> * @param[in] fd poll fd.</span>
|
|||
|
|
<span class="cm"> * @param[in] action action to be executed.</span>
|
|||
|
|
<span class="cm"> * @param[in] param private data past to action.</span>
|
|||
|
|
<span class="cm"> */</span>
|
|||
|
|
<span class="kt">void</span> <span class="nf">aos_cancel_poll_read_fd</span><span class="p">(</span><span class="kt">int</span> <span class="n">fd</span><span class="p">,</span> <span class="n">aos_poll_call_t</span> <span class="n">action</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">param</span><span class="p">);</span>
|
|||
|
|
</pre></div>
|
|||
|
|
</div>
|
|||
|
|
<ul class="simple">
|
|||
|
|
<li><p>发布和取消一个延迟执行的 action</p></li>
|
|||
|
|
</ul>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cm">/**static void adc_cb_read(int fd, void *param)</span>
|
|||
|
|
<span class="cm">{</span>
|
|||
|
|
<span class="cm"> aos_post_event(EV_ADCKEY, CODE_ADCKEY_INT_TRIGGER, fd);</span>
|
|||
|
|
<span class="cm">}</span>
|
|||
|
|
<span class="cm"> * Post a delayed action to be executed in main loop.</span>
|
|||
|
|
<span class="cm"> *</span>
|
|||
|
|
<span class="cm"> * @param[in] ms milliseconds to wait.</span>
|
|||
|
|
<span class="cm"> * @param[in] action action to be executed.</span>
|
|||
|
|
<span class="cm"> * @param[in] arg private data past to action.</span>
|
|||
|
|
<span class="cm"> *</span>
|
|||
|
|
<span class="cm"> * @return the operation status, 0 is OK,others is error.</span>
|
|||
|
|
<span class="cm"> */</span>
|
|||
|
|
<span class="kt">int</span> <span class="nf">aos_post_delayed_action</span><span class="p">(</span><span class="kt">int</span> <span class="n">ms</span><span class="p">,</span> <span class="n">aos_call_t</span> <span class="n">action</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">arg</span><span class="p">);</span>
|
|||
|
|
|
|||
|
|
<span class="cm">/**</span>
|
|||
|
|
<span class="cm"> * Cancel a delayed action to be executed in main loop.</span>
|
|||
|
|
<span class="cm"> *</span>
|
|||
|
|
<span class="cm"> * @param[in] ms milliseconds to wait, -1 means don't care.</span>
|
|||
|
|
<span class="cm"> * @param[in] action action to be executed.</span>
|
|||
|
|
<span class="cm"> * @param[in] arg private data past to action.</span>
|
|||
|
|
<span class="cm"> */</span>
|
|||
|
|
<span class="kt">void</span> <span class="nf">aos_cancel_delayed_action</span><span class="p">(</span><span class="kt">int</span> <span class="n">ms</span><span class="p">,</span> <span class="n">aos_call_t</span> <span class="n">action</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">arg</span><span class="p">);</span>
|
|||
|
|
</pre></div>
|
|||
|
|
</div>
|
|||
|
|
<ul class="simple">
|
|||
|
|
<li><p>安排一次回调</p></li>
|
|||
|
|
</ul>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cm">/**</span>
|
|||
|
|
<span class="cm"> * Schedule a callback in next event loop.</span>
|
|||
|
|
<span class="cm"> * Unlike aos_post_delayed_action,</span>
|
|||
|
|
<span class="cm"> * this function can be called from non-aos-main-loop context.</span>
|
|||
|
|
|
|||
|
|
<span class="cm"> * @param[in] action action to be executed.</span>
|
|||
|
|
<span class="cm"> * @param[in] arg private data past to action.</span>
|
|||
|
|
<span class="cm"> *</span>
|
|||
|
|
<span class="cm"> * @return the operation status, <0 is error,others is OK.</span>
|
|||
|
|
<span class="cm"> */</span>
|
|||
|
|
<span class="kt">int</span> <span class="nf">aos_schedule_call</span><span class="p">(</span><span class="n">aos_call_t</span> <span class="n">action</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">arg</span><span class="p">);</span>
|
|||
|
|
</pre></div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<div class="section" id="id5">
|
|||
|
|
<h2><span class="section-number">11.6. </span>示例代码<a class="headerlink" href="#id5" title="永久链接至标题">¶</a></h2>
|
|||
|
|
<p>这里会介绍<a class="reference external" href="#事件注册、通知、回调、取消流程">事件注册、通知、回调、取消流程</a>、<a class="reference external" href="#poll事件的注册取消">poll事件的注册取消</a>、<a class="reference external" href="#延迟执行一个action">延迟执行一个actio</a>)以及<a class="reference external" href="#安排一次回调">安排一次回调</a>的使用方法</p>
|
|||
|
|
<div class="section" id="id6">
|
|||
|
|
<h3><span class="section-number">11.6.1. </span>事件注册、通知、回调、取消流程<a class="headerlink" href="#id6" title="永久链接至标题">¶</a></h3>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">aos_register_event_filter</span><span class="p">(</span><span class="n">EV_WIFI</span><span class="p">,</span> <span class="n">event_cb_wifi_event</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
|
|||
|
|
</pre></div>
|
|||
|
|
</div>
|
|||
|
|
<p>用户首先调用<code class="docutils literal notranslate"><span class="pre">aos_register_event_filter</span></code>注册事件监听函数，例如首先显注册一个<code class="docutils literal notranslate"><span class="pre">EV_WIFI</span></code>事件的监听函数<code class="docutils literal notranslate"><span class="pre">event_cb_wifi_event</span></code></p>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">aos_post_event</span><span class="p">(</span><span class="n">EV_WIFI</span><span class="p">,</span> <span class="n">CODE_WIFI_ON_INIT_DONE</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span>
|
|||
|
|
</pre></div>
|
|||
|
|
</div>
|
|||
|
|
<p>当有任务调用<code class="docutils literal notranslate"><span class="pre">aos_post_event</span></code>接口，发布<code class="docutils literal notranslate"><span class="pre">CODE_WIFI_ON_INIT_DONE</span></code>事件之后</p>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">static</span> <span class="kt">void</span> <span class="nf">event_cb_wifi_event</span><span class="p">(</span><span class="n">input_event_t</span> <span class="o">*</span><span class="n">event</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">private_data</span><span class="p">)</span>
|
|||
|
|
<span class="p">{</span>
|
|||
|
|
<span class="k">switch</span> <span class="p">(</span>
|
|||
|
|
<span class="k">case</span> <span class="nl">CODE_WIFI_ON_INIT_DONE</span><span class="p">:</span>
|
|||
|
|
<span class="p">{</span>
|
|||
|
|
<span class="n">printf</span><span class="p">(</span><span class="s">"[APP] [EVT] CODE_WIFI_ON_INIT_DONE %lld</span><span class="se">\r\n</span><span class="s">"</span><span class="p">,</span> <span class="n">aos_now_ms</span><span class="p">());</span>
|
|||
|
|
<span class="p">}</span>
|
|||
|
|
<span class="k">break</span><span class="p">;</span>
|
|||
|
|
<span class="k">case</span> <span class="nl">CODE_WIFI_ON_PRE_GOT_IP</span><span class="p">:</span>
|
|||
|
|
<span class="p">{</span>
|
|||
|
|
<span class="n">printf</span><span class="p">(</span><span class="s">"[APP] [EVT] connected %lld</span><span class="se">\r\n</span><span class="s">"</span><span class="p">,</span> <span class="n">aos_now_ms</span><span class="p">());</span>
|
|||
|
|
<span class="p">}</span>
|
|||
|
|
<span class="k">break</span><span class="p">;</span>
|
|||
|
|
<span class="k">case</span> <span class="nl">CODE_WIFI_ON_GOT_IP</span><span class="p">:</span>
|
|||
|
|
<span class="p">{</span>
|
|||
|
|
<span class="n">printf</span><span class="p">(</span><span class="s">"[APP] [EVT] GOT IP %lld</span><span class="se">\r\n</span><span class="s">"</span><span class="p">,</span> <span class="n">aos_now_ms</span><span class="p">());</span>
|
|||
|
|
<span class="p">}</span>
|
|||
|
|
<span class="k">break</span><span class="p">;</span>
|
|||
|
|
<span class="k">default</span><span class="o">:</span>
|
|||
|
|
<span class="p">{</span>
|
|||
|
|
<span class="cm">/*nothing*/</span>
|
|||
|
|
<span class="p">}</span>
|
|||
|
|
<span class="p">}</span>
|
|||
|
|
<span class="p">}</span>
|
|||
|
|
</pre></div>
|
|||
|
|
</div>
|
|||
|
|
<p><code class="docutils literal notranslate"><span class="pre">event_cb_wifi_event</span></code>会被调用，并进入case<code class="docutils literal notranslate"><span class="pre">CODE_WIFI_ON_INIT_DONE</span></code>分支</p>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">aos_unregister_event_filter</span><span class="p">(</span><span class="n">EV_WIFI</span><span class="p">,</span> <span class="n">event_cb_wifi_event</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
|
|||
|
|
</pre></div>
|
|||
|
|
</div>
|
|||
|
|
<p>如果用户不需要事件的监听，用户可以主动调用<code class="docutils literal notranslate"><span class="pre">aos_unregister_event_filter</span></code>取消监听</p>
|
|||
|
|
</div>
|
|||
|
|
<div class="section" id="poll">
|
|||
|
|
<h3><span class="section-number">11.6.2. </span>poll事件的注册取消<a class="headerlink" href="#poll" title="永久链接至标题">¶</a></h3>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cm">/*uart*/</span>
|
|||
|
|
<span class="n">fd_console</span> <span class="o">=</span> <span class="n">aos_open</span><span class="p">(</span><span class="s">"/dev/ttyS0"</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span>
|
|||
|
|
<span class="k">if</span> <span class="p">(</span><span class="n">fd_console</span> <span class="o">>=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
|
|||
|
|
<span class="n">printf</span><span class="p">(</span><span class="s">"Init CLI with event Driven</span><span class="se">\r\n</span><span class="s">"</span><span class="p">);</span>
|
|||
|
|
<span class="n">aos_cli_init</span><span class="p">(</span><span class="mi">0</span><span class="p">);</span>
|
|||
|
|
<span class="n">aos_poll_read_fd</span><span class="p">(</span><span class="n">fd_console</span><span class="p">,</span> <span class="n">aos_cli_event_cb_read_get</span><span class="p">(),</span> <span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="p">)</span><span class="mh">0x12345678</span><span class="p">);</span>
|
|||
|
|
<span class="n">_cli_init</span><span class="p">();</span>
|
|||
|
|
<span class="p">}</span>
|
|||
|
|
</pre></div>
|
|||
|
|
</div>
|
|||
|
|
<p>这里以 <code class="docutils literal notranslate"><span class="pre">uart0</span></code> 为例，用户首先注册一个<code class="docutils literal notranslate"><span class="pre">aos_poll_read_fd</span></code>poll事件</p>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">aos_cancel_poll_read_fd</span><span class="p">(</span><span class="n">fd_console</span><span class="p">,</span> <span class="n">action</span><span class="p">,</span> <span class="p">(</span><span class="kt">void</span><span class="o">*</span><span class="p">)</span><span class="mh">0x12345678</span><span class="p">);</span>
|
|||
|
|
</pre></div>
|
|||
|
|
</div>
|
|||
|
|
<p>如果用户不需要事件的poll，用户可以调用<code class="docutils literal notranslate"><span class="pre">aos_cancel_poll_read_fd</span></code> 取消poll</p>
|
|||
|
|
</div>
|
|||
|
|
<div class="section" id="action">
|
|||
|
|
<h3><span class="section-number">11.6.3. </span>延迟执行一个action<a class="headerlink" href="#action" title="永久链接至标题">¶</a></h3>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">aos_post_delayed_action</span><span class="p">(</span><span class="mi">1000</span><span class="p">,</span> <span class="n">app_delayed_action_print</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
|
|||
|
|
</pre></div>
|
|||
|
|
</div>
|
|||
|
|
<p>用户可以调用<code class="docutils literal notranslate"><span class="pre">aos_post_delayed_action</span></code>做一个延迟<code class="docutils literal notranslate"><span class="pre">1s</span></code>执行的事件</p>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">static</span> <span class="kt">void</span> <span class="nf">app_delayed_action_print</span><span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">arg</span><span class="p">)</span>
|
|||
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|
<span class="p">{</span>
|
|||
|
|
<span class="n">printf</span><span class="p">(</span><span class="s">"test.</span><span class="se">\r\n</span><span class="s">"</span><span class="p">);</span>
|
|||
|
|
<span class="p">}</span>
|
|||
|
|
</pre></div>
|
|||
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|
</div>
|
|||
|
|
<p>那过<code class="docutils literal notranslate"><span class="pre">1s</span></code>之后会主动调用<code class="docutils literal notranslate"><span class="pre">app_delayed_action_print</span></code>函数</p>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">aos_cancel_delayed_action</span><span class="p">(</span><span class="mi">1000</span><span class="p">,</span> <span class="n">app_delayed_action_print</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
|
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|
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</pre></div>
|
|||
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</div>
|
|||
|
|
<p>当用户想直接取消一个延迟动作可以调用<code class="docutils literal notranslate"><span class="pre">aos_cancel_delayed_action</span></code>，其第一个<code class="docutils literal notranslate"><span class="pre">ms</span></code>参数,
|
|||
|
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当<code class="docutils literal notranslate"><span class="pre">ms</span> <span class="pre">==</span> <span class="pre">-1</span></code>时，表示无需关心时间是否一致</p>
|
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</div>
|
|||
|
|
<div class="section" id="id7">
|
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<h3><span class="section-number">11.6.4. </span>安排一次回调<a class="headerlink" href="#id7" title="永久链接至标题">¶</a></h3>
|
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|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">aos_schedule_call</span><span class="p">(</span><span class="n">app_action_print</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
|
|||
|
|
</pre></div>
|
|||
|
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</div>
|
|||
|
|
<p>用户主动调用<code class="docutils literal notranslate"><span class="pre">aos_schedule_call</span></code>函数</p>
|
|||
|
|
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">static</span> <span class="nf">app_action_print</span><span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">arg</span><span class="p">)</span>
|
|||
|
|
<span class="p">{</span>
|
|||
|
|
<span class="n">printf</span><span class="p">(</span><span class="s">"test</span><span class="se">\r\n</span><span class="s">"</span><span class="p">);</span>
|
|||
|
|
<span class="p">}</span>
|
|||
|
|
</pre></div>
|
|||
|
|
</div>
|
|||
|
|
<p>那么会在下一次循环中主动调用<code class="docutils literal notranslate"><span class="pre">app_action_print</span></code>函数</p>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<div class="section" id="id8">
|
|||
|
|
<h2><span class="section-number">11.7. </span>注意事项<a class="headerlink" href="#id8" title="永久链接至标题">¶</a></h2>
|
|||
|
|
<p>Yloop的API(include/aos/yloop.h)除了下述API，都必须在Yloop实例所绑定的任务的上下文执行：</p>
|
|||
|
|
<ul class="simple">
|
|||
|
|
<li><p>aos_schedule_call</p></li>
|
|||
|
|
<li><p>aos_loop_schedule_call</p></li>
|
|||
|
|
<li><p>aos_loop_schedule_work</p></li>
|
|||
|
|
<li><p>aos_cancel_work</p></li>
|
|||
|
|
<li><p>aos_post_event</p></li>
|
|||
|
|
</ul>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
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|
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<p>
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