我如何从任意pthread_t获取线程ID？(How do I get a thread ID from an arbitrary pthread_t?)

 我有一个pthread_t，我想改变它的CPU亲和力。 问题是我使用glibc 2.3.2，它没有pthread_setaffinity_np（） 。 不过，这很好，因为pthread_setaffinity_np（）本身就是sched_setaffinity（）的包装，可以通过传递线程ID而不是进程ID来设置任意线程的关联来调用它。 
 
 但是 ... sched_setaffinity可以使用的线程ID是一个操作系统线程ID，可以从gettid（）系统调用中获得。 这与opaque类型pthread_t不同 ，gettid（）只会返回当前线程的线程ID。 我需要能够设置任意线程的CPU亲和力。 
 
 不幸的是，我无法访问pthread的私有部分，这会让我通过将pthread_t转换为struct pthread *来窃取线程id。 我想，所有的更好，因为依赖私有实现需要更多的麻烦。 
 
 我也一直在阅读pthread_getunique_np函数，但是这会返回一个“唯一的整型标识符” - 我不认为它以任何形式或形式等同于操作系统线程ID。 
 
 因此，问题：我如何从任意pthread_t获取线程ID？ 

I have a pthread_t, and I'd like to change its CPU affinity. The problem is that I'm using glibc 2.3.2, which doesn't have pthread_setaffinity_np(). That's OK, though, because pthread_setaffinity_np() is itself a wrapper of sched_setaffinity(), which can be called by passing a thread ID instead of a process ID to set the affinity for an arbitrary thread.
 
BUT ... The thread id that sched_setaffinity can work with is an OS thread id, the kind that you can get from the gettid() system call. This is different from the opaque type pthread_t, and gettid() will only return the thread-id of the current thread. I need to be able to set the CPU affinity of an arbitrary thread.
 
Unfortunately, I can't access the pthread's private parts, which would let me steal the thread id by casting a pthread_t to a struct pthread *. All the better, I guess, since relying on private implementations is asking for even more trouble.
 
I've also been reading up on the pthread_getunique_np function, however this returns a "unique integral identifier" -- which I don't believe is in any way shape or form equivalent to an OS thread id.
 
Hence, the question: How can I get a thread ID from an arbitrary pthread_t?

原文：https://stackoverflow.com/questions/558469