获得线程LWP

最新推荐文章于 2022-10-26 09:55:19 发布

原创最新推荐文章于 2022-10-26 09:55:19 发布 · 954 阅读

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#linux #thread #LWP

本文探讨了pthread_self与gettid这两个函数的区别。gettid返回的是内核线程ID，在多线程进程中每个线程都有唯一的TID；而pthread_self返回的是POSIX线程ID，用于在同一进程中区分不同线程。

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#include <stdio.h>
#include <sys/syscall.h>
#include <unistd.h>
//
//#include <sys/types.h>
int main()
{
printf("hello,tid is %ld\n",(long int)syscall(SYS_gettid));
}
~

http://blog.youkuaiyun.com/tianyue168/article/details/7403693

http://blog.youkuaiyun.com/delphiwcdj/article/details/8476547

http://zhwen.org/xlog/?p=622

这几天写程序老是使用thread来做，所以自己封装了一个threadbase的类来做简单的测试使用，但是在写的过程种发现又两个获取线程id的函数：pthread_self和gettid，那这两个函数有什么区别呢？

看gettid的man，这样写道：
gettid() returns the caller’s thread ID (TID). In a single-threaded process, the thread ID is equal to the process ID
(PID, as returned by getpid(2)). In a multithreaded process, all threads have the same PID, but each one has a unique
TID. For further details, see the discussion of CLONE_THREAD in clone(2).

The thread ID returned by this call is not the same thing as a POSIX thread ID (i.e., the opaque value returned by
pthread_self(3)).

而pthread_self的man这样写：

Thread IDs are only guaranteed to be unique within a process. A thread ID may be reused after a terminated thread has

been joined, or a detached thread has terminated.

The thread ID returned by pthread_self() is not the same thing as the kernel thread ID returned by a call to get‐
tid(2).

现在可以大体知道pthread_self是为了区分同一进程种不同的线程，而gettid获取的线程id和pid是有关系的。