Pthread导致的memory leak

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 joinable 
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