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class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/app/psram_load.html" id="id-d5856e1734-link">分散加载</a></div></div></li><li role="treeitem" aria-expanded="true"><div data-tocid="id-d5856e1746" class="topicref" data-id="id" data-state="expanded"><span role="button" tabindex="0" aria-labelledby="button-collapse-action id-d5856e1746-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/app/dm.html" id="id-d5856e1746-link">动态加载 (DM-APP)</a></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem"><div data-tocid="kernel_config-d5856e1758" class="topicref" data-id="kernel_config" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/app/dm_kernel_config.html" id="kernel_config-d5856e1758-link">Kernel 配置</a></div></div></li><li role="treeitem"><div data-tocid="dm_app_dev-d5856e1770" class="topicref" data-id="dm_app_dev" data-state="leaf"><span role="button" 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aria-labelledby="button-expand-action id-d5856e1806-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/secure/chapter-secure.html" id="id-d5856e1806-link">安全方案</a></div></div></li><li role="treeitem"><div data-tocid="mkfs_partition_image-d5856e1866" class="topicref" data-id="mkfs_partition_image" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/app/mkfs_partition_image.html" id="mkfs_partition_image-d5856e1866-link">制作分区镜像</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e1878" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e1878-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/d13x_bare_boot/index.html" id="id-d5856e1878-link">客制化启动</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e1963" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e1963-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/burnsys/burner_offline_lite.html" id="id-d5856e1963-link">离线烧录</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_display-d5856e2011" class="topicref" data-id="usb_display" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_display-d5856e2011-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/app/usb-display.html" id="usb_display-d5856e2011-link">USB Display 方案</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e2119" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e2119-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/peripheral/peripheral-intro.html" id="id-d5856e2119-link">外设移植</a><div class="wh-tooltip"><p class="shortdesc"><span class="ph">CTP、U 盘、SD 卡、有线和无线网络</span>等外设的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e2244" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e2244-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/bringup/chapter-bringup.html" id="id-d5856e2244-link">BringUp</a><div class="wh-tooltip"><p class="shortdesc">在硬件上电后快速初始化系统，为操作系统的启动准备好必要的硬件环境。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e2345" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e2345-link" class="wh-expand-btn"></span><div class="title"><a 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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/app/dm_app_run_compile.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">编译和运行</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 4 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d143151e26__20250121171609">DM-APP 可以被编译成两种类型：可执行文件 (<span class="+ topic/ph sw-d/filepath ph filepath">.mo</span>) 和库文件
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(<span class="+ topic/ph sw-d/filepath ph filepath">.so</span>)。本质上两者都是 <span class="+ topic/ph sw-d/filepath ph filepath">ET_DYN</span> 类型的 ELF 文件，唯一的不同是可执行文件指定了
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<span class="+ topic/keyword pr-d/parmname keyword parmname">main</span> 函数作为执行入口，而库文件指定了 <span class="+ topic/keyword pr-d/parmname keyword parmname">0</span> 作为执行入口。</p><section class="- topic/section section" id="dm_app_run_compile__section_xj1_mvm_tdc" data-ofbid="dm_app_run_compile__section_xj1_mvm_tdc"><h2 class="- topic/title title sectiontitle">编译和运行可执行文件<span class="+ topic/ph sw-d/filepath ph filepath">.mo</span></h2>
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<div class="- topic/p p" data-ofbid="d143151e50__20250121171609">执行本节步骤前，确认打开正确的命令行运行环境：<ul class="- topic/ul ul" id="dm_app_run_compile__ul_zt5_4vm_tdc" data-ofbid="dm_app_run_compile__ul_zt5_4vm_tdc"><li class="- topic/li li" data-ofbid="d143151e53__20250121171609">
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<p class="- topic/p p" data-ofbid="d143151e55__20250121171609">在 Windows 系统上：双击 <span class="+ topic/ph sw-d/filepath ph filepath">win_env.bat</span> 打开命令行运行环境。</p>
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</li><li class="- topic/li li" data-ofbid="d143151e61__20250121171609">
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<p class="- topic/p p" data-ofbid="d143151e63__20250121171609">在 Linux 系统上：直接使用 Shell 命令行即可。</p>
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</li></ul><ol class="- topic/ol ol" id="dm_app_run_compile__ul_nf4_2m5_fdc" data-ofbid="dm_app_run_compile__ul_nf4_2m5_fdc"><li class="- topic/li li" data-ofbid="d143151e67__20250121171609">进入 dm-app
|
||
根目录：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_l5b_zl5_fdc" data-ofbid="dm_app_run_compile__codeblock_l5b_zl5_fdc">cd luban-lite/packages/artinchip/aic-dm-apps</pre></li><li class="- topic/li li" data-ofbid="d143151e71__20250121171609">执行下列命令编译 dm-app
|
||
为可执行文件：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_yhy_b1n_tdc" data-ofbid="dm_app_run_compile__codeblock_yhy_b1n_tdc">scons --app=hello</pre></li><li class="- topic/li li" data-ofbid="d143151e75__20250121171609">查看目标文件：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_dn2_c1n_tdc" data-ofbid="dm_app_run_compile__codeblock_dn2_c1n_tdc">ls hello/hello.mo</pre></li><li class="- topic/li li" data-ofbid="d143151e79__20250121171609">如有需要，执行下列命令可清理目标文件，否则可跳过此步：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_sgm_c1n_tdc" data-ofbid="dm_app_run_compile__codeblock_sgm_c1n_tdc">scons --app=hello -c</pre></li><li class="- topic/li li" data-ofbid="d143151e83__20250121171609">将生成的 <span class="+ topic/ph sw-d/filepath ph filepath">hello.mo</span> 文件拷贝到单板存储介质的文件系统中：</li><li class="- topic/li li" data-ofbid="d143151e88__20250121171609">在 Shell
|
||
下直接运行：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_m5b_zl5_fdc" data-ofbid="dm_app_run_compile__codeblock_m5b_zl5_fdc">/sdcard/hello.mo</pre><div class="- topic/p p" data-ofbid="d143151e92__20250121171609">系统输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_ivy_z1n_tdc" data-ofbid="dm_app_run_compile__codeblock_ivy_z1n_tdc">[AIC-DM-APP] init! <em class="hl-comment">// DM 初始化函数 module_init()</em>
|
||
[AIC-DM-APP] Hello, world! <em class="hl-comment">// DM 主函数 main()</em>
|
||
index => <span class="hl-number">0</span> <em class="hl-comment">// my_thread_init() 调用 rt-thread API 创建的线程</em>
|
||
index => <span class="hl-number">1</span>
|
||
index => <span class="hl-number">2</span>
|
||
index => <span class="hl-number">3</span></pre></div></li></ol></div>
|
||
</section><section class="- topic/section section" id="dm_app_run_compile__section_lbt_kvm_tdc" data-ofbid="dm_app_run_compile__section_lbt_kvm_tdc"><h2 class="- topic/title title sectiontitle">编译和运行库文件 <span class="+ topic/ph sw-d/filepath ph filepath">.so</span></h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d143151e104__20250121171609">
|
||
<ol class="- topic/ol ol" id="dm_app_run_compile__ol_b3c_hbn_tdc" data-ofbid="dm_app_run_compile__ol_b3c_hbn_tdc"><li class="- topic/li li" data-ofbid="d143151e107__20250121171609">进入 dm-app
|
||
根目录：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_c4x_gbn_tdc" data-ofbid="dm_app_run_compile__codeblock_c4x_gbn_tdc">cd luban-lite/packages/artinchip/aic-dm-apps</pre></li><li class="- topic/li li" data-ofbid="d143151e111__20250121171609">执行下列命令编译 dm-app
|
||
为可执行文件：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_d4x_gbn_tdc" data-ofbid="dm_app_run_compile__codeblock_d4x_gbn_tdc">scons --app=hello</pre></li><li class="- topic/li li" data-ofbid="d143151e115__20250121171609">查看目标文件：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_e4x_gbn_tdc" data-ofbid="dm_app_run_compile__codeblock_e4x_gbn_tdc">ls hello/hello.so</pre></li><li class="- topic/li li" data-ofbid="d143151e119__20250121171609">如有需要，执行下列命令可清理目标文件，否则可跳过此步：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_f4x_gbn_tdc" data-ofbid="dm_app_run_compile__codeblock_f4x_gbn_tdc">scons --app=hello -c</pre></li><li class="- topic/li li" data-ofbid="d143151e123__20250121171609">在 Kernel 中使能 <span class="+ topic/ph ui-d/uicontrol ph uicontrol">test_dm_lib</span>
|
||
测试命令：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_xmn_d45_fdc" data-ofbid="dm_app_run_compile__codeblock_xmn_d45_fdc">Drivers options --->
|
||
Drivers examples --->
|
||
[*] Enable DM Lib test command</pre></li><li class="- topic/li li" data-ofbid="d143151e130__20250121171609">
|
||
<p class="- topic/p p" data-ofbid="d143151e132__20250121171609">将生成的 <span class="+ topic/ph sw-d/filepath ph filepath">hello.so</span> 拷贝到单板存储介质的文件系统中。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d143151e138__20250121171609">
|
||
<p class="- topic/p p" data-ofbid="d143151e140__20250121171609">使用 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">test_dm_lib</span> 命令来动态加载：</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_o5b_zl5_fdc" data-ofbid="dm_app_run_compile__codeblock_o5b_zl5_fdc">test_dm_lib <em class="hl-comment">// dlopen() 动态加载 /sdcard/hello.so</em></pre>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_wtr_2pm_tdc" data-ofbid="dm_app_run_compile__codeblock_wtr_2pm_tdc">[AIC-DM-APP] init! <em class="hl-comment">// DM 初始化函数 module_init()</em>
|
||
index => <span class="hl-number">0</span> <em class="hl-comment">// my_thread_init() 调用 rt-thread API 创建的线程</em>
|
||
index => <span class="hl-number">1</span>
|
||
index => <span class="hl-number">2</span></pre>
|
||
</li></ol>
|
||
</div>
|
||
</section><section class="- topic/section section" id="dm_app_run_compile__section_s2t_m5m_tdc" data-ofbid="dm_app_run_compile__section_s2t_m5m_tdc"><h2 class="- topic/title title sectiontitle">实例代码注意事项</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d143151e159__20250121171609">本节根据实例代码分析，详细书面了使用可执行文件 <span class="+ topic/ph sw-d/filepath ph filepath">hello.mo</span> 和库文件
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">hello.so</span> 的源码时需要注意的特殊事项：</p>
|
||
<ul class="- topic/ul ul" id="dm_app_run_compile__ul_bzg_3fb_pdc" data-ofbid="dm_app_run_compile__ul_bzg_3fb_pdc"><li class="- topic/li li" data-ofbid="d143151e169__20250121171609">
|
||
<div class="- topic/div div section" id="dm_app_run_compile__id11"><strong class="+ topic/ph hi-d/b ph b">可执行文件 <span class="+ topic/ph sw-d/filepath ph filepath">.mo</span> 注意事项</strong>
|
||
<ol class="- topic/ol ol" id="dm_app_run_compile__ol_img_bn5_fdc" data-ofbid="dm_app_run_compile__ol_img_bn5_fdc"><li class="- topic/li li" data-ofbid="d143151e179__20250121171609">
|
||
<div class="- topic/div div section" id="dm_app_run_compile__rt-thread-api"><strong class="+ topic/ph hi-d/b ph b">RT-Thread API
|
||
的调用</strong>
|
||
<div class="- topic/p p" data-ofbid="d143151e185__20250121171609">在 <span class="+ topic/ph sw-d/filepath ph filepath">hello.mo</span> 中，可以调用如
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">rt_thread_create</span>、
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">rt_thread_startup</span> 等 RT-Thread API。这些
|
||
API 默认已经使用 <span class="+ topic/keyword pr-d/apiname keyword apiname">RTM_EXPORT()</span> 声明，可以直接调用
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">luban-lite/packages/artinchip/aic-dm-apps/hello/rtt_api_test.c</span>。例如：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_x1w_245_fdc" data-ofbid="dm_app_run_compile__codeblock_x1w_245_fdc">#include <rtthread.h>
|
||
|
||
<strong class="hl-keyword">void</strong> my_thread_entry(<strong class="hl-keyword">void</strong>* parameter)
|
||
{
|
||
<strong class="hl-keyword">int</strong> index = <span class="hl-number">0</span>;
|
||
|
||
<strong class="hl-keyword">while</strong> (<span class="hl-number">1</span>)
|
||
{
|
||
rt_kprintf(<span class="hl-string">"index => %d\n"</span>, index ++);
|
||
rt_thread_delay(RT_TICK_PER_SECOND);
|
||
}
|
||
}
|
||
|
||
<strong class="hl-keyword">int</strong> my_thread_init(<strong class="hl-keyword">void</strong>)
|
||
{
|
||
rt_thread_t tid;
|
||
|
||
tid = rt_thread_create(<span class="hl-string">"tMyTask"</span>, my_thread_entry, RT_NULL,
|
||
<span class="hl-number">2048</span>, <span class="hl-number">20</span>, <span class="hl-number">20</span>);
|
||
|
||
<strong class="hl-keyword">if</strong> (tid != RT_NULL)
|
||
rt_thread_startup(tid);
|
||
|
||
<strong class="hl-keyword">return</strong> <span class="hl-number">0</span>;
|
||
}</pre></div></div>
|
||
</li><li class="- topic/li li" data-ofbid="d143151e206__20250121171609">
|
||
<div class="- topic/div div section" id="dm_app_run_compile__id12"><strong class="+ topic/ph hi-d/b ph b">模块初始化和退出函数</strong>
|
||
<div class="- topic/p p" data-ofbid="d143151e212__20250121171609">如果 dm-app 定义了 <span class="+ topic/keyword pr-d/apiname keyword apiname">module_init()</span> 和
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">module_cleanup()</span>
|
||
函数，它们会在模块初始化和退出时被自动调用
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">luban-lite/packages/artinchip/aic-dm-apps/hello/main.c</span>。例如：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_zjc_g45_fdc" data-ofbid="dm_app_run_compile__codeblock_zjc_g45_fdc"><strong class="hl-keyword">void</strong> module_init(<strong class="hl-keyword">struct</strong> rt_dlmodule *module)
|
||
{
|
||
printf(<span class="hl-string">"[AIC-DM-APP] init!\n"</span>);
|
||
}
|
||
|
||
<strong class="hl-keyword">void</strong> module_cleanup(<strong class="hl-keyword">struct</strong> rt_dlmodule *module)
|
||
{
|
||
printf(<span class="hl-string">"[AIC-DM-APP] exit!\n"</span>);
|
||
}</pre>
|
||
</div><p class="- topic/p p" data-ofbid="d143151e226__20250121171609">用户可以利用该机制来做一些初始化和清理的工作。如果不需要，则无需实现这两个函数。</p></div>
|
||
</li><li class="- topic/li li" data-ofbid="d143151e229__20250121171609">
|
||
<div class="- topic/div div section" id="dm_app_run_compile__hello-mo">
|
||
<strong class="+ topic/ph hi-d/b ph b">查看 <span class="+ topic/ph sw-d/filepath ph filepath">hello.mo</span> 创建的子线程</strong>
|
||
<p class="- topic/p p" data-ofbid="d143151e239__20250121171609">从代码可知，运行 <span class="+ topic/ph sw-d/filepath ph filepath">hello.mo</span> 后会创建
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">tMyTask</code> 线程，但使用 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">ps</span> 或者
|
||
<span class="+ topic/keyword sw-d/cmdname keyword cmdname">list_thread</span>
|
||
命令无法看到该线程。这是因为该方式下启动的线程会被链接到模块本身的进程链表
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">module->object_list</code> ，而上述命令只能查看全局链表
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">information->object_list</code>
|
||
中的线程。</p><p class="- topic/p p" data-ofbid="d143151e260__20250121171609">目前模块本身的进程链表
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">module->object_list</code>
|
||
不支持命令查看，在模块退出时会停止掉 <code class="+ topic/ph pr-d/codeph ph codeph">module->object_list</code>
|
||
中模块启动的所有子进程。</p>
|
||
</div>
|
||
</li><li class="- topic/li li" data-ofbid="d143151e270__20250121171609">
|
||
<div class="- topic/div div section" id="dm_app_run_compile__id13">
|
||
<strong class="+ topic/ph hi-d/b ph b">后台进程保活</strong>
|
||
<div class="- topic/p p" data-ofbid="d143151e277__20250121171609">当 <span class="+ topic/ph sw-d/filepath ph filepath">hello.mo</span> 的 <span class="+ topic/keyword pr-d/apiname keyword apiname">main()</span>
|
||
函数返回后，系统马上会执行模块退出动作，<span class="+ topic/keyword pr-d/apiname keyword apiname">main()</span>
|
||
函数创建的所有子进程也会被全部清理。为了让模块的子进程作为后台进程继续运行，可以为
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">hello.mo</span> 的
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">main()</span> 函数定义一个特殊返回值
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">RT_DLMODULE_DEAMON</span>。如果返回该值，则
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">main()</span> 函数返回后系统不会执行模块退出动作。例如
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">luban-lite/packages/artinchip/aic-dm-apps/hello/main.c</span>：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_d23_h45_fdc" data-ofbid="dm_app_run_compile__codeblock_d23_h45_fdc">#<span class="hl-directive">define</span> RT_API_TEST
|
||
|
||
<strong class="hl-keyword">int</strong> main(<strong class="hl-keyword">int</strong> argc, <strong class="hl-keyword">char</strong> *argv[])
|
||
{
|
||
printf(<span class="hl-string">"[AIC-DM-APP] Hello, world!\n"</span>);
|
||
|
||
#ifdef RT_API_TEST
|
||
my_thread_init();
|
||
<strong class="hl-keyword">return</strong> RT_DLMODULE_DEAMON;
|
||
#endif
|
||
|
||
<strong class="hl-keyword">return</strong> <span class="hl-number">0</span>;
|
||
}</pre></div></div>
|
||
</li></ol></div>
|
||
</li><li class="- topic/li li" data-ofbid="d143151e308__20250121171609">
|
||
<div class="- topic/div div section" id="dm_app_run_compile__id14">
|
||
<strong class="+ topic/ph hi-d/b ph b">库文件 <span class="+ topic/ph sw-d/filepath ph filepath">.so</span></strong>
|
||
<ol class="- topic/ol ol" id="dm_app_run_compile__ol_mjz_bn5_fdc" data-ofbid="dm_app_run_compile__ol_mjz_bn5_fdc"><li class="- topic/li li" data-ofbid="d143151e318__20250121171609">
|
||
<div class="- topic/div div section" id="dm_app_run_compile__dlopen-dlsym">
|
||
<strong class="+ topic/ph hi-d/b ph b"><span class="+ topic/keyword pr-d/apiname keyword apiname">dlopen()</span>、<span class="+ topic/keyword pr-d/apiname keyword apiname">dlsym()</span> 实例</strong>
|
||
<div class="- topic/p p" data-ofbid="d143151e330__20250121171609"><span class="+ topic/keyword sw-d/cmdname keyword cmdname">test_dm_lib</span> 命令的基本原理是使用
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">dlopen()</span> 函数动态加载
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">hello.so</span> 到系统内存，再使用
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">dlsym()</span> 函数查找到
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">hello.so</span> 中的
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">my_thread_init()</span> 函数并调用
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">luban-lite/bsp/examples/test-dm-lib/test_dm_lib.c</span>。例如：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dm_app_run_compile__codeblock_dtn_j45_fdc" data-ofbid="dm_app_run_compile__codeblock_dtn_j45_fdc">#<span class="hl-directive">define</span> DM_LIB_PATH <span class="hl-string">"/sdcard/hello.so"</span>
|
||
#<span class="hl-directive">define</span> DM_LIB_FUNC <span class="hl-string">"my_thread_init"</span>
|
||
#<span class="hl-directive">define</span> DEAMON_THREAD
|
||
|
||
<strong class="hl-keyword">static</strong> <strong class="hl-keyword">void</strong> cmd_test_dm_lib(<strong class="hl-keyword">int</strong> argc, <strong class="hl-keyword">char</strong> **argv)
|
||
{
|
||
<strong class="hl-keyword">struct</strong> rt_dlmodule *module = NULL;
|
||
<strong class="hl-keyword">int</strong> (*func)(<strong class="hl-keyword">void</strong>) = NULL;
|
||
|
||
module = dlopen(DM_LIB_PATH, <span class="hl-number">0</span>);
|
||
<strong class="hl-keyword">if</strong> (!module) {
|
||
printf(<span class="hl-string">"dlopen %s fail!\n"</span>, DM_LIB_PATH);
|
||
<strong class="hl-keyword">return</strong>;
|
||
}
|
||
|
||
func = dlsym(module, DM_LIB_FUNC);
|
||
<strong class="hl-keyword">if</strong> (!func) {
|
||
printf(<span class="hl-string">"dlsym %s fail!\n"</span>, DM_LIB_FUNC);
|
||
<strong class="hl-keyword">return</strong>;
|
||
}
|
||
|
||
func();
|
||
|
||
#ifndef DEAMON_THREAD
|
||
dlclose(module);
|
||
#endif
|
||
}</pre></div></div>
|
||
</li><li class="- topic/li li" data-ofbid="d143151e356__20250121171609">
|
||
<div class="- topic/div div section" id="dm_app_run_compile__hello-so">
|
||
<strong class="+ topic/ph hi-d/b ph b">查看 <span class="+ topic/ph sw-d/filepath ph filepath">hello.so</span> 创建的子线程</strong>
|
||
<p class="- topic/p p" data-ofbid="d143151e366__20250121171609">通过 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">test_dm_lib</span> 命令动态加载
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">hello.so</span> 并调用
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">my_thread_init()</span> 函数，同样会会创建
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">tMyTask</code> 线程。上述示例中，使用
|
||
<span class="+ topic/keyword sw-d/cmdname keyword cmdname">ps</span> 或者 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">list_thread</span>
|
||
命令可以看到该线程，是因为系统通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">dlmodule_self()</span>
|
||
判断当前进程非模块执行进程，对应的进程链表就加入到了全局链表
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">information->object_list</code>
|
||
中。</p></div>
|
||
</li><li class="- topic/li li" data-ofbid="d143151e394__20250121171609">
|
||
<div class="- topic/div div section" id="dm_app_run_compile__id15"><strong class="+ topic/ph hi-d/b ph b">后台进程保活</strong>
|
||
<p class="- topic/p p" data-ofbid="d143151e400__20250121171609">当调用 <span class="+ topic/keyword pr-d/apiname keyword apiname">my_thread_init()</span> 函数返回后，常规情况是执行
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">dlclose(module)</span> 来清理动态加载的模块。如果
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">my_thread_init()</span>
|
||
函数创建的所有子进程希望作为后台进程运行，则不能调用
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">dlclose(module)</span> 来卸载动态库。因为一旦调用
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">dlclose(module)</span>，动态库就会被卸载，而此时后台进程可能仍在运行并需要访问动态库中的数据。一旦有新的内存分配就会覆盖原动态模块的数据，触发
|
||
CPU 异常。 </p><p class="- topic/p p" data-ofbid="d143151e417__20250121171609">为了避免这种情况，可以在不调用
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">dlclose(module)</span>
|
||
的情况下让程序持续运行，或者在程序结束时手动清理动态库占用的资源。</p></div>
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