Pthread导致的memory leak

最新推荐文章于 2023-09-01 15:11:38 发布

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最新推荐文章于 2023-09-01 15:11:38 发布 · 1.8k 阅读

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本文探讨了在Linux环境中，多线程编程中由于使用Pthread可能导致的内存泄漏问题。官方解释了joinable和detached两种线程状态，指出在joinable状态下，pthread_exit不会释放资源，而detach状态或使用pthread_join可以避免资源泄漏。文章提供了三种防止内存泄漏的方法，包括在线程中调用pthread_detach，创建时指定PTHREAD_CREATE_DETACHED属性，以及使用pthread_join等待线程结束。

今天在解决客户的一个内存泄露的问题，客户提供了source code，但从代码语法，代码结构上的检查，都没有发现什么问题，编码风格还算整洁，那为什么还有Memory Leak？

客户代码有一个特点，使用了多线程，而且用得还比较频繁，而且初看代码，也没有问题，线和有创建pthread_create, 都会有退出pthread_exit，那问题在那里，于是，就查看了下linux的api手册，仔细研究了下linux 的thread.

##Linux如此说

A thread may either  be  joinable  or  detached.   If  a  thread  is  joinable,  then  another  thread  can  call
       pthread_join(3)  to  wait for the thread to terminate and fetch its exit status.  Only when a terminated joinable
       thread has been joined are the last of its resources released back to the system.  When a detached thread  termi‐
       nates, its resources are automatically released back to the system: it is not possible to join with the thread in
       order to obtain its exit status.  Making a thread detached is useful for some types of daemon threads whose  exit
       status  the  application  does  not need to care about.  By default, a new thread is created in a joinab