pthread_mutex_lock(&search_flag_mutex);
时间: 2023-10-13 17:00:20 浏览: 72
pthread_mutex
回答: 代码片段中的`pthread_mutex_lock(&search_flag_mutex)`是用于对互斥锁进行加锁操作的语句。这是一个多线程编程中常用的函数,用于保护共享资源,防止多个线程同时访问导致数据不一致的问题。在C语言中,`pthread_mutex_lock`函数会尝试加锁,如果锁已经被其他线程占用,则当前线程会被阻塞,直到获得锁为止。在C中,标准库`std::mutex`只是对`pthread_mutex_t`的一个封装,提供了更便捷的操作方式,例如`lock()`函数用于加锁,`unlock()`函数用于解锁。而`pthread_mutex_lock`函数则是直接调用了操作系统提供的API对互斥锁进行操作。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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