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<!DOCTYPE html>
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<title>linux线程基础 | Jeskson-微服务分布式</title>
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href="/JavaPlusDoc/aJava/cookie-session-token.html" class="sidebar-link">Cookie/Session/Token</a></li></ul></section></li></ul> </aside> <div class="password-shadow password-wrapper-in" style="display:none;" data-v-59e6cb88 data-v-7dd95ae2><h3 class="title" data-v-59e6cb88>linux线程基础</h3> <!----> <label id="box" class="inputBox" data-v-59e6cb88><input type="password" value="" data-v-59e6cb88> <span data-v-59e6cb88>Konck! 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2025
</a></span></div></div> <div data-v-7dd95ae2><div data-v-7dd95ae2><main class="page"><section style="display:;"><div class="page-title"><h1 class="title">linux线程基础</h1> <div data-v-8a445198><i class="iconfont reco-account" data-v-8a445198><span data-v-8a445198>哪吒</span></i> <i class="iconfont reco-date" data-v-8a445198><span data-v-8a445198>2023/6/15</span></i> <!----> <!----></div></div> <div class="theme-reco-content content__default"><h1 id="linux线程基础"><a href="#linux线程基础" class="header-anchor">#</a> Linux线程基础</h1> <h2 id="_1-线程概念与特性"><a href="#_1-线程概念与特性" class="header-anchor">#</a> 1. 线程概念与特性</h2> <h3 id="_1-1-什么是线程"><a href="#_1-1-什么是线程" class="header-anchor">#</a> 1.1 什么是线程</h3> <p>线程（Thread）是操作系统能够进行运算调度的最小单位，它被包含在进程之中，是进程中的实际运作单位。一个进程可以包含多个线程，这些线程共享进程的资源，如内存空间、文件描述符等。</p> <div class="language-c extra-class"><pre class="language-c"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><pthread.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdio.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdlib.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><unistd.h></span></span>
<span class="token comment">// 线程函数示例</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">thread_function</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">int</span> thread_id <span class="token operator">=</span> <span class="token operator">*</span><span class="token punctuation">(</span><span class="token keyword">int</span><span class="token operator">*</span><span class="token punctuation">)</span>arg<span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"线程 %d 正在运行\n"</span><span class="token punctuation">,</span> thread_id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 模拟工作</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">5</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"线程 %d: 工作步骤 %d\n"</span><span class="token punctuation">,</span> thread_id<span class="token punctuation">,</span> i <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"线程 %d 完成工作\n"</span><span class="token punctuation">,</span> thread_id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h3 id="_1-2-线程与进程的区别"><a href="#_1-2-线程与进程的区别" class="header-anchor">#</a> 1.2 线程与进程的区别</h3> <table><thead><tr><th>特性</th> <th>进程</th> <th>线程</th></tr></thead> <tbody><tr><td>资源占用</td> <td>独立的内存空间</td> <td>共享进程内存空间</td></tr> <tr><td>创建开销</td> <td>较大</td> <td>较小</td></tr> <tr><td>通信方式</td> <td>IPC（管道、消息队列等）</td> <td>共享内存、信号量</td></tr> <tr><td>切换开销</td> <td>较大</td> <td>较小</td></tr> <tr><td>独立性</td> <td>高度独立</td> <td>相互依赖</td></tr></tbody></table> <h3 id="_1-3-线程的优势"><a href="#_1-3-线程的优势" class="header-anchor">#</a> 1.3 线程的优势</h3> <ul><li><strong>并发执行</strong>：多个线程可以同时执行不同的任务</li> <li><strong>资源共享</strong>：线程间可以方便地共享数据</li> <li><strong>响应性</strong>：提高程序的响应速度</li> <li><strong>经济性</strong>：创建和切换开销小</li></ul> <h2 id="_2-posix线程-pthread"><a href="#_2-posix线程-pthread" class="header-anchor">#</a> 2. POSIX线程（pthread）</h2> <h3 id="_2-1-pthread库简介"><a href="#_2-1-pthread库简介" class="header-anchor">#</a> 2.1 pthread库简介</h3> <p>POSIX线程（pthread）是Linux系统中标准的线程API，提供了创建、管理和同步线程的函数。</p> <div class="language-c extra-class"><pre class="language-c"><code><span class="token comment">// 编译时需要链接pthread库</span>
<span class="token comment">// gcc -o program program.c -lpthread</span>
</code></pre></div><h3 id="_2-2-线程创建与管理"><a href="#_2-2-线程创建与管理" class="header-anchor">#</a> 2.2 线程创建与管理</h3> <h4 id="创建线程"><a href="#创建线程" class="header-anchor">#</a> 创建线程</h4> <div class="language-c extra-class"><pre class="language-c"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><pthread.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdio.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdlib.h></span></span>
<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token class-name">pthread_t</span> thread1<span class="token punctuation">,</span> thread2<span class="token punctuation">;</span>
<span class="token keyword">int</span> thread1_id <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">,</span> thread2_id <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> result<span class="token punctuation">;</span>
<span class="token comment">// 创建线程1</span>
result <span class="token operator">=</span> <span class="token function">pthread_create</span><span class="token punctuation">(</span><span class="token operator">&</span>thread1<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">,</span> thread_function<span class="token punctuation">,</span> <span class="token operator">&</span>thread1_id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>result <span class="token operator">!=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"创建线程1失败\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">exit</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 创建线程2</span>
result <span class="token operator">=</span> <span class="token function">pthread_create</span><span class="token punctuation">(</span><span class="token operator">&</span>thread2<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">,</span> thread_function<span class="token punctuation">,</span> <span class="token operator">&</span>thread2_id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>result <span class="token operator">!=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"创建线程2失败\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">exit</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"主线程：已创建两个工作线程\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 等待线程完成</span>
<span class="token function">pthread_join</span><span class="token punctuation">(</span>thread1<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_join</span><span class="token punctuation">(</span>thread2<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"主线程：所有线程已完成\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h4 id="线程属性设置"><a href="#线程属性设置" class="header-anchor">#</a> 线程属性设置</h4> <div class="language-c extra-class"><pre class="language-c"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><pthread.h></span></span>
<span class="token keyword">void</span> <span class="token function">create_detached_thread</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token class-name">pthread_t</span> thread<span class="token punctuation">;</span>
<span class="token class-name">pthread_attr_t</span> attr<span class="token punctuation">;</span>
<span class="token comment">// 初始化线程属性</span>
<span class="token function">pthread_attr_init</span><span class="token punctuation">(</span><span class="token operator">&</span>attr<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 设置为分离状态</span>
<span class="token function">pthread_attr_setdetachstate</span><span class="token punctuation">(</span><span class="token operator">&</span>attr<span class="token punctuation">,</span> PTHREAD_CREATE_DETACHED<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 设置栈大小</span>
<span class="token class-name">size_t</span> stack_size <span class="token operator">=</span> <span class="token number">1024</span> <span class="token operator">*</span> <span class="token number">1024</span><span class="token punctuation">;</span> <span class="token comment">// 1MB</span>
<span class="token function">pthread_attr_setstacksize</span><span class="token punctuation">(</span><span class="token operator">&</span>attr<span class="token punctuation">,</span> stack_size<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 创建线程</span>
<span class="token function">pthread_create</span><span class="token punctuation">(</span><span class="token operator">&</span>thread<span class="token punctuation">,</span> <span class="token operator">&</span>attr<span class="token punctuation">,</span> thread_function<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 销毁属性对象</span>
<span class="token function">pthread_attr_destroy</span><span class="token punctuation">(</span><span class="token operator">&</span>attr<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="_3-线程同步机制"><a href="#_3-线程同步机制" class="header-anchor">#</a> 3. 线程同步机制</h2> <h3 id="_3-1-互斥锁-mutex"><a href="#_3-1-互斥锁-mutex" class="header-anchor">#</a> 3.1 互斥锁（Mutex）</h3> <p>互斥锁用于保护共享资源，确保同一时间只有一个线程可以访问临界区。</p> <div class="language-c extra-class"><pre class="language-c"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><pthread.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdio.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><unistd.h></span></span>
<span class="token comment">// 全局变量和互斥锁</span>
<span class="token keyword">int</span> shared_counter <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token class-name">pthread_mutex_t</span> counter_mutex <span class="token operator">=</span> PTHREAD_MUTEX_INITIALIZER<span class="token punctuation">;</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">increment_counter</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">int</span> thread_id <span class="token operator">=</span> <span class="token operator">*</span><span class="token punctuation">(</span><span class="token keyword">int</span><span class="token operator">*</span><span class="token punctuation">)</span>arg<span class="token punctuation">;</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">100000</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// 加锁</span>
<span class="token function">pthread_mutex_lock</span><span class="token punctuation">(</span><span class="token operator">&</span>counter_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 临界区：修改共享变量</span>
shared_counter<span class="token operator">++</span><span class="token punctuation">;</span>
<span class="token comment">// 解锁</span>
<span class="token function">pthread_mutex_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>counter_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"线程 %d 完成计数\n"</span><span class="token punctuation">,</span> thread_id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token class-name">pthread_t</span> threads<span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> thread_ids<span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">// 创建多个线程</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">3</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_create</span><span class="token punctuation">(</span><span class="token operator">&</span>threads<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">,</span> increment_counter<span class="token punctuation">,</span> <span class="token operator">&</span>thread_ids<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 等待所有线程完成</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">3</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_join</span><span class="token punctuation">(</span>threads<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"最终计数值: %d\n"</span><span class="token punctuation">,</span> shared_counter<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 销毁互斥锁</span>
<span class="token function">pthread_mutex_destroy</span><span class="token punctuation">(</span><span class="token operator">&</span>counter_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h3 id="_3-2-条件变量-condition-variable"><a href="#_3-2-条件变量-condition-variable" class="header-anchor">#</a> 3.2 条件变量（Condition Variable）</h3> <p>条件变量用于线程间的条件同步，允许线程等待特定条件的发生。</p> <div class="language-c extra-class"><pre class="language-c"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><pthread.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdio.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdlib.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><unistd.h></span></span>
<span class="token comment">// 生产者-消费者模型</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name">BUFFER_SIZE</span> <span class="token expression"><span class="token number">10</span></span></span>
<span class="token keyword">int</span> buffer<span class="token punctuation">[</span>BUFFER_SIZE<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> buffer_count <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> in <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> out <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token class-name">pthread_mutex_t</span> buffer_mutex <span class="token operator">=</span> PTHREAD_MUTEX_INITIALIZER<span class="token punctuation">;</span>
<span class="token class-name">pthread_cond_t</span> buffer_not_full <span class="token operator">=</span> PTHREAD_COND_INITIALIZER<span class="token punctuation">;</span>
<span class="token class-name">pthread_cond_t</span> buffer_not_empty <span class="token operator">=</span> PTHREAD_COND_INITIALIZER<span class="token punctuation">;</span>
<span class="token comment">// 生产者线程</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">producer</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">int</span> producer_id <span class="token operator">=</span> <span class="token operator">*</span><span class="token punctuation">(</span><span class="token keyword">int</span><span class="token operator">*</span><span class="token punctuation">)</span>arg<span class="token punctuation">;</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">20</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_mutex_lock</span><span class="token punctuation">(</span><span class="token operator">&</span>buffer_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 等待缓冲区不满</span>
<span class="token keyword">while</span><span class="token punctuation">(</span>buffer_count <span class="token operator">==</span> BUFFER_SIZE<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"生产者 %d: 缓冲区满，等待...\n"</span><span class="token punctuation">,</span> producer_id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_cond_wait</span><span class="token punctuation">(</span><span class="token operator">&</span>buffer_not_full<span class="token punctuation">,</span> <span class="token operator">&</span>buffer_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 生产数据</span>
<span class="token keyword">int</span> item <span class="token operator">=</span> i <span class="token operator">+</span> producer_id <span class="token operator">*</span> <span class="token number">100</span><span class="token punctuation">;</span>
buffer<span class="token punctuation">[</span>in<span class="token punctuation">]</span> <span class="token operator">=</span> item<span class="token punctuation">;</span>
in <span class="token operator">=</span> <span class="token punctuation">(</span>in <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">%</span> BUFFER_SIZE<span class="token punctuation">;</span>
buffer_count<span class="token operator">++</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"生产者 %d: 生产了 %d，缓冲区数量: %d\n"</span><span class="token punctuation">,</span>
producer_id<span class="token punctuation">,</span> item<span class="token punctuation">,</span> buffer_count<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 通知消费者</span>
<span class="token function">pthread_cond_signal</span><span class="token punctuation">(</span><span class="token operator">&</span>buffer_not_empty<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_mutex_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>buffer_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">usleep</span><span class="token punctuation">(</span><span class="token number">100000</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 0.1秒</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 消费者线程</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">consumer</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">int</span> consumer_id <span class="token operator">=</span> <span class="token operator">*</span><span class="token punctuation">(</span><span class="token keyword">int</span><span class="token operator">*</span><span class="token punctuation">)</span>arg<span class="token punctuation">;</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">20</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_mutex_lock</span><span class="token punctuation">(</span><span class="token operator">&</span>buffer_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 等待缓冲区不空</span>
<span class="token keyword">while</span><span class="token punctuation">(</span>buffer_count <span class="token operator">==</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"消费者 %d: 缓冲区空，等待...\n"</span><span class="token punctuation">,</span> consumer_id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_cond_wait</span><span class="token punctuation">(</span><span class="token operator">&</span>buffer_not_empty<span class="token punctuation">,</span> <span class="token operator">&</span>buffer_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 消费数据</span>
<span class="token keyword">int</span> item <span class="token operator">=</span> buffer<span class="token punctuation">[</span>out<span class="token punctuation">]</span><span class="token punctuation">;</span>
out <span class="token operator">=</span> <span class="token punctuation">(</span>out <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">%</span> BUFFER_SIZE<span class="token punctuation">;</span>
buffer_count<span class="token operator">--</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"消费者 %d: 消费了 %d，缓冲区数量: %d\n"</span><span class="token punctuation">,</span>
consumer_id<span class="token punctuation">,</span> item<span class="token punctuation">,</span> buffer_count<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 通知生产者</span>
<span class="token function">pthread_cond_signal</span><span class="token punctuation">(</span><span class="token operator">&</span>buffer_not_full<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_mutex_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>buffer_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">usleep</span><span class="token punctuation">(</span><span class="token number">150000</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 0.15秒</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h3 id="_3-3-读写锁-read-write-lock"><a href="#_3-3-读写锁-read-write-lock" class="header-anchor">#</a> 3.3 读写锁（Read-Write Lock）</h3> <p>读写锁允许多个读者同时访问，但写者独占访问。</p> <div class="language-c extra-class"><pre class="language-c"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><pthread.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdio.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><unistd.h></span></span>
<span class="token comment">// 共享数据和读写锁</span>
<span class="token keyword">int</span> shared_data <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token class-name">pthread_rwlock_t</span> data_rwlock <span class="token operator">=</span> PTHREAD_RWLOCK_INITIALIZER<span class="token punctuation">;</span>
<span class="token comment">// 读者线程</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">reader</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">int</span> reader_id <span class="token operator">=</span> <span class="token operator">*</span><span class="token punctuation">(</span><span class="token keyword">int</span><span class="token operator">*</span><span class="token punctuation">)</span>arg<span class="token punctuation">;</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">5</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// 获取读锁</span>
<span class="token function">pthread_rwlock_rdlock</span><span class="token punctuation">(</span><span class="token operator">&</span>data_rwlock<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"读者 %d: 读取数据 = %d\n"</span><span class="token punctuation">,</span> reader_id<span class="token punctuation">,</span> shared_data<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 释放读锁</span>
<span class="token function">pthread_rwlock_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>data_rwlock<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 写者线程</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">writer</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">int</span> writer_id <span class="token operator">=</span> <span class="token operator">*</span><span class="token punctuation">(</span><span class="token keyword">int</span><span class="token operator">*</span><span class="token punctuation">)</span>arg<span class="token punctuation">;</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">3</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// 获取写锁</span>
<span class="token function">pthread_rwlock_wrlock</span><span class="token punctuation">(</span><span class="token operator">&</span>data_rwlock<span class="token punctuation">)</span><span class="token punctuation">;</span>
shared_data <span class="token operator">+=</span> <span class="token number">10</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"写者 %d: 写入数据 = %d\n"</span><span class="token punctuation">,</span> writer_id<span class="token punctuation">,</span> shared_data<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 释放写锁</span>
<span class="token function">pthread_rwlock_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>data_rwlock<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="_4-线程池实现"><a href="#_4-线程池实现" class="header-anchor">#</a> 4. 线程池实现</h2> <h3 id="_4-1-简单线程池设计"><a href="#_4-1-简单线程池设计" class="header-anchor">#</a> 4.1 简单线程池设计</h3> <div class="language-c extra-class"><pre class="language-c"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><pthread.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdio.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdlib.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><unistd.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name">MAX_THREADS</span> <span class="token expression"><span class="token number">4</span></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name">MAX_QUEUE</span> <span class="token expression"><span class="token number">100</span></span></span>
<span class="token comment">// 任务结构</span>
<span class="token keyword">typedef</span> <span class="token keyword">struct</span> <span class="token punctuation">{</span>
<span class="token keyword">void</span> <span class="token punctuation">(</span><span class="token operator">*</span>function<span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span><span class="token operator">*</span> argument<span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token class-name">task_t</span><span class="token punctuation">;</span>
<span class="token comment">// 线程池结构</span>
<span class="token keyword">typedef</span> <span class="token keyword">struct</span> <span class="token punctuation">{</span>
<span class="token class-name">pthread_t</span> threads<span class="token punctuation">[</span>MAX_THREADS<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token class-name">task_t</span> task_queue<span class="token punctuation">[</span>MAX_QUEUE<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> queue_front<span class="token punctuation">;</span>
<span class="token keyword">int</span> queue_rear<span class="token punctuation">;</span>
<span class="token keyword">int</span> queue_size<span class="token punctuation">;</span>
<span class="token keyword">int</span> shutdown<span class="token punctuation">;</span>
<span class="token class-name">pthread_mutex_t</span> queue_mutex<span class="token punctuation">;</span>
<span class="token class-name">pthread_cond_t</span> queue_not_empty<span class="token punctuation">;</span>
<span class="token class-name">pthread_cond_t</span> queue_not_full<span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token class-name">thread_pool_t</span><span class="token punctuation">;</span>
<span class="token class-name">thread_pool_t</span> pool<span class="token punctuation">;</span>
<span class="token comment">// 工作线程函数</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">worker_thread</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">while</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_mutex_lock</span><span class="token punctuation">(</span><span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 等待任务</span>
<span class="token keyword">while</span><span class="token punctuation">(</span>pool<span class="token punctuation">.</span>queue_size <span class="token operator">==</span> <span class="token number">0</span> <span class="token operator">&&</span> <span class="token operator">!</span>pool<span class="token punctuation">.</span>shutdown<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_cond_wait</span><span class="token punctuation">(</span><span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_not_empty<span class="token punctuation">,</span> <span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 检查是否需要关闭</span>
<span class="token keyword">if</span><span class="token punctuation">(</span>pool<span class="token punctuation">.</span>shutdown<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_mutex_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 取出任务</span>
<span class="token class-name">task_t</span> task <span class="token operator">=</span> pool<span class="token punctuation">.</span>task_queue<span class="token punctuation">[</span>pool<span class="token punctuation">.</span>queue_front<span class="token punctuation">]</span><span class="token punctuation">;</span>
pool<span class="token punctuation">.</span>queue_front <span class="token operator">=</span> <span class="token punctuation">(</span>pool<span class="token punctuation">.</span>queue_front <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">%</span> MAX_QUEUE<span class="token punctuation">;</span>
pool<span class="token punctuation">.</span>queue_size<span class="token operator">--</span><span class="token punctuation">;</span>
<span class="token comment">// 通知可以添加新任务</span>
<span class="token function">pthread_cond_signal</span><span class="token punctuation">(</span><span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_not_full<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_mutex_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 执行任务</span>
task<span class="token punctuation">.</span><span class="token function">function</span><span class="token punctuation">(</span>task<span class="token punctuation">.</span>argument<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 初始化线程池</span>
<span class="token keyword">void</span> <span class="token function">thread_pool_init</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
pool<span class="token punctuation">.</span>queue_front <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
pool<span class="token punctuation">.</span>queue_rear <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
pool<span class="token punctuation">.</span>queue_size <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
pool<span class="token punctuation">.</span>shutdown <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token function">pthread_mutex_init</span><span class="token punctuation">(</span><span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_mutex<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_cond_init</span><span class="token punctuation">(</span><span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_not_empty<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_cond_init</span><span class="token punctuation">(</span><span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_not_full<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 创建工作线程</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> MAX_THREADS<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_create</span><span class="token punctuation">(</span><span class="token operator">&</span>pool<span class="token punctuation">.</span>threads<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">,</span> worker_thread<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"线程池初始化完成，创建了 %d 个工作线程\n"</span><span class="token punctuation">,</span> MAX_THREADS<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 添加任务到线程池</span>
<span class="token keyword">void</span> <span class="token function">thread_pool_add_task</span><span class="token punctuation">(</span><span class="token keyword">void</span> <span class="token punctuation">(</span><span class="token operator">*</span>function<span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">void</span><span class="token operator">*</span> argument<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_mutex_lock</span><span class="token punctuation">(</span><span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 等待队列不满</span>
<span class="token keyword">while</span><span class="token punctuation">(</span>pool<span class="token punctuation">.</span>queue_size <span class="token operator">==</span> MAX_QUEUE<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_cond_wait</span><span class="token punctuation">(</span><span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_not_full<span class="token punctuation">,</span> <span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 添加任务</span>
pool<span class="token punctuation">.</span>task_queue<span class="token punctuation">[</span>pool<span class="token punctuation">.</span>queue_rear<span class="token punctuation">]</span><span class="token punctuation">.</span>function <span class="token operator">=</span> function<span class="token punctuation">;</span>
pool<span class="token punctuation">.</span>task_queue<span class="token punctuation">[</span>pool<span class="token punctuation">.</span>queue_rear<span class="token punctuation">]</span><span class="token punctuation">.</span>argument <span class="token operator">=</span> argument<span class="token punctuation">;</span>
pool<span class="token punctuation">.</span>queue_rear <span class="token operator">=</span> <span class="token punctuation">(</span>pool<span class="token punctuation">.</span>queue_rear <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">%</span> MAX_QUEUE<span class="token punctuation">;</span>
pool<span class="token punctuation">.</span>queue_size<span class="token operator">++</span><span class="token punctuation">;</span>
<span class="token comment">// 通知工作线程</span>
<span class="token function">pthread_cond_signal</span><span class="token punctuation">(</span><span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_not_empty<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_mutex_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>pool<span class="token punctuation">.</span>queue_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 示例任务函数</span>
<span class="token keyword">void</span> <span class="token function">example_task</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">int</span> task_id <span class="token operator">=</span> <span class="token operator">*</span><span class="token punctuation">(</span><span class="token keyword">int</span><span class="token operator">*</span><span class="token punctuation">)</span>arg<span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"执行任务 %d，线程ID: %lu\n"</span><span class="token punctuation">,</span> task_id<span class="token punctuation">,</span> <span class="token function">pthread_self</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 模拟工作</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"任务 %d 完成\n"</span><span class="token punctuation">,</span> task_id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="_5-线程安全与最佳实践"><a href="#_5-线程安全与最佳实践" class="header-anchor">#</a> 5. 线程安全与最佳实践</h2> <h3 id="_5-1-线程安全的概念"><a href="#_5-1-线程安全的概念" class="header-anchor">#</a> 5.1 线程安全的概念</h3> <p>线程安全是指在多线程环境下，程序能够正确地处理多个线程同时访问共享资源的情况。</p> <h3 id="_5-2-常见的线程安全问题"><a href="#_5-2-常见的线程安全问题" class="header-anchor">#</a> 5.2 常见的线程安全问题</h3> <h4 id="竞态条件-race-condition"><a href="#竞态条件-race-condition" class="header-anchor">#</a> 竞态条件（Race Condition）</h4> <div class="language-c extra-class"><pre class="language-c"><code><span class="token comment">// 不安全的代码示例</span>
<span class="token keyword">int</span> global_counter <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">unsafe_increment</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">100000</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// 这里存在竞态条件</span>
global_counter<span class="token operator">++</span><span class="token punctuation">;</span> <span class="token comment">// 非原子操作</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 安全的代码示例</span>
<span class="token class-name">pthread_mutex_t</span> safe_mutex <span class="token operator">=</span> PTHREAD_MUTEX_INITIALIZER<span class="token punctuation">;</span>
<span class="token keyword">int</span> safe_counter <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">safe_increment</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">100000</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_mutex_lock</span><span class="token punctuation">(</span><span class="token operator">&</span>safe_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
safe_counter<span class="token operator">++</span><span class="token punctuation">;</span> <span class="token comment">// 受保护的操作</span>
<span class="token function">pthread_mutex_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>safe_mutex<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h4 id="死锁-deadlock"><a href="#死锁-deadlock" class="header-anchor">#</a> 死锁（Deadlock）</h4> <div class="language-c extra-class"><pre class="language-c"><code><span class="token comment">// 可能导致死锁的代码</span>
<span class="token class-name">pthread_mutex_t</span> mutex1 <span class="token operator">=</span> PTHREAD_MUTEX_INITIALIZER<span class="token punctuation">;</span>
<span class="token class-name">pthread_mutex_t</span> mutex2 <span class="token operator">=</span> PTHREAD_MUTEX_INITIALIZER<span class="token punctuation">;</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">thread1_func</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_mutex_lock</span><span class="token punctuation">(</span><span class="token operator">&</span>mutex1<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"线程1获得mutex1\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_mutex_lock</span><span class="token punctuation">(</span><span class="token operator">&</span>mutex2<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 可能死锁</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"线程1获得mutex2\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_mutex_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>mutex2<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_mutex_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>mutex1<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">thread2_func</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_mutex_lock</span><span class="token punctuation">(</span><span class="token operator">&</span>mutex2<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"线程2获得mutex2\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_mutex_lock</span><span class="token punctuation">(</span><span class="token operator">&</span>mutex1<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 可能死锁</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"线程2获得mutex1\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_mutex_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>mutex1<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_mutex_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>mutex2<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 避免死锁的方法：统一加锁顺序</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">safe_thread1_func</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">pthread_mutex_lock</span><span class="token punctuation">(</span><span class="token operator">&</span>mutex1<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 总是先锁mutex1</span>
<span class="token function">pthread_mutex_lock</span><span class="token punctuation">(</span><span class="token operator">&</span>mutex2<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 再锁mutex2</span>
<span class="token comment">// 执行工作</span>
<span class="token function">pthread_mutex_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>mutex2<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">pthread_mutex_unlock</span><span class="token punctuation">(</span><span class="token operator">&</span>mutex1<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h3 id="_5-3-最佳实践"><a href="#_5-3-最佳实践" class="header-anchor">#</a> 5.3 最佳实践</h3> <ol><li><strong>最小化锁的范围</strong>：只在必要时加锁，尽快释放</li> <li><strong>避免嵌套锁</strong>：减少死锁的可能性</li> <li><strong>使用RAII模式</strong>：确保资源正确释放</li> <li><strong>优先使用高级同步原语</strong>：如条件变量、读写锁</li> <li><strong>线程局部存储</strong>：减少共享数据</li></ol> <div class="language-c extra-class"><pre class="language-c"><code><span class="token comment">// 线程局部存储示例</span>
__thread <span class="token keyword">int</span> thread_local_var <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">thread_function</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">int</span> thread_id <span class="token operator">=</span> <span class="token operator">*</span><span class="token punctuation">(</span><span class="token keyword">int</span><span class="token operator">*</span><span class="token punctuation">)</span>arg<span class="token punctuation">;</span>
<span class="token comment">// 每个线程都有自己的副本</span>
thread_local_var <span class="token operator">=</span> thread_id <span class="token operator">*</span> <span class="token number">100</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"线程 %d 的局部变量: %d\n"</span><span class="token punctuation">,</span> thread_id<span class="token punctuation">,</span> thread_local_var<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="_6-性能优化与调试"><a href="#_6-性能优化与调试" class="header-anchor">#</a> 6. 性能优化与调试</h2> <h3 id="_6-1-性能监控"><a href="#_6-1-性能监控" class="header-anchor">#</a> 6.1 性能监控</h3> <div class="language-c extra-class"><pre class="language-c"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><sys/time.h></span></span>
<span class="token comment">// 性能计时器</span>
<span class="token keyword">double</span> <span class="token function">get_time</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">struct</span> <span class="token class-name">timeval</span> tv<span class="token punctuation">;</span>
<span class="token function">gettimeofday</span><span class="token punctuation">(</span><span class="token operator">&</span>tv<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> tv<span class="token punctuation">.</span>tv_sec <span class="token operator">+</span> tv<span class="token punctuation">.</span>tv_usec <span class="token operator">/</span> <span class="token number">1000000.0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">void</span><span class="token operator">*</span> <span class="token function">performance_test_thread</span><span class="token punctuation">(</span><span class="token keyword">void</span><span class="token operator">*</span> arg<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">double</span> start_time <span class="token operator">=</span> <span class="token function">get_time</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 执行工作</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">1000000</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// 模拟计算</span>
<span class="token punctuation">}</span>
<span class="token keyword">double</span> end_time <span class="token operator">=</span> <span class="token function">get_time</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"线程执行时间: %.6f 秒\n"</span><span class="token punctuation">,</span> end_time <span class="token operator">-</span> start_time<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token constant">NULL</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h3 id="_6-2-调试技巧"><a href="#_6-2-调试技巧" class="header-anchor">#</a> 6.2 调试技巧</h3> <div class="language-bash extra-class"><pre class="language-bash"><code><span class="token comment"># 使用gdb调试多线程程序</span>
gdb ./program
<span class="token punctuation">(</span>gdb<span class="token punctuation">)</span> <span class="token builtin class-name">set</span> scheduler-locking on <span class="token comment"># 锁定调度器</span>
<span class="token punctuation">(</span>gdb<span class="token punctuation">)</span> info threads <span class="token comment"># 查看所有线程</span>
<span class="token punctuation">(</span>gdb<span class="token punctuation">)</span> thread <span class="token number">2</span> <span class="token comment"># 切换到线程2</span>
<span class="token punctuation">(</span>gdb<span class="token punctuation">)</span> bt <span class="token comment"># 查看调用栈</span>
<span class="token comment"># 使用valgrind检测线程问题</span>
valgrind <span class="token parameter variable">--tool</span><span class="token operator">=</span>helgrind ./program
valgrind <span class="token parameter variable">--tool</span><span class="token operator">=</span>drd ./program
</code></pre></div><h2 id="_7-总结"><a href="#_7-总结" class="header-anchor">#</a> 7. 总结</h2> <p>Linux线程编程是系统编程的重要组成部分，掌握以下要点：</p> <ul><li><strong>基础概念</strong>：理解线程与进程的区别</li> <li><strong>POSIX线程</strong>：熟练使用pthread API</li> <li><strong>同步机制</strong>：正确使用互斥锁、条件变量、读写锁</li> <li><strong>线程安全</strong>：避免竞态条件和死锁</li> <li><strong>性能优化</strong>：合理设计线程架构</li> <li><strong>调试技巧</strong>：使用专业工具定位问题</li></ul> <p>通过实践这些概念和技术，可以编写出高效、安全的多线程程序。</p></div></section> <footer class="page-edit"><!----> <!----></footer> <div class="page-nav"><p class="inner"><span class="prev"><a href="/JavaPlusDoc/thread/threadpool-executor.html" class="prev">
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POSIX线程（pthread）</a></li><li class="level-3" data-v-b57cc07c><a href="/JavaPlusDoc/aThread/linux.html#_2-1-pthread库简介" class="sidebar-link reco-side-_2-1-pthread库简介" data-v-b57cc07c>2.1 pthread库简介</a></li><li class="level-3" data-v-b57cc07c><a href="/JavaPlusDoc/aThread/linux.html#_2-2-线程创建与管理" class="sidebar-link reco-side-_2-2-线程创建与管理" data-v-b57cc07c>2.2 线程创建与管理</a></li><li class="level-2" data-v-b57cc07c><a href="/JavaPlusDoc/aThread/linux.html#_3-线程同步机制" class="sidebar-link reco-side-_3-线程同步机制" data-v-b57cc07c>3. 线程同步机制</a></li><li class="level-3" data-v-b57cc07c><a href="/JavaPlusDoc/aThread/linux.html#_3-1-互斥锁-mutex" class="sidebar-link reco-side-_3-1-互斥锁-mutex" data-v-b57cc07c>3.1 互斥锁（Mutex）</a></li><li class="level-3" data-v-b57cc07c><a href="/JavaPlusDoc/aThread/linux.html#_3-2-条件变量-condition-variable" class="sidebar-link reco-side-_3-2-条件变量-condition-variable" data-v-b57cc07c>3.2 条件变量（Condition Variable）</a></li><li class="level-3" data-v-b57cc07c><a 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data-v-b57cc07c>5.2 常见的线程安全问题</a></li><li class="level-3" data-v-b57cc07c><a href="/JavaPlusDoc/aThread/linux.html#_5-3-最佳实践" class="sidebar-link reco-side-_5-3-最佳实践" data-v-b57cc07c>5.3 最佳实践</a></li><li class="level-2" data-v-b57cc07c><a href="/JavaPlusDoc/aThread/linux.html#_6-性能优化与调试" class="sidebar-link reco-side-_6-性能优化与调试" data-v-b57cc07c>6. 性能优化与调试</a></li><li class="level-3" data-v-b57cc07c><a href="/JavaPlusDoc/aThread/linux.html#_6-1-性能监控" class="sidebar-link reco-side-_6-1-性能监控" data-v-b57cc07c>6.1 性能监控</a></li><li class="level-3" data-v-b57cc07c><a href="/JavaPlusDoc/aThread/linux.html#_6-2-调试技巧" class="sidebar-link reco-side-_6-2-调试技巧" data-v-b57cc07c>6.2 调试技巧</a></li><li class="level-2" data-v-b57cc07c><a href="/JavaPlusDoc/aThread/linux.html#_7-总结" class="sidebar-link reco-side-_7-总结" data-v-b57cc07c>7. 总结</a></li></ul></div></div></div><div class="global-ui"><div class="back-to-ceiling" 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