pthread和errno：pthread函数在出错的时候不会设置errno，而是直接返回错误值。

pthread_create() won’t ever set errno. pthread function returns zero on success, and an error code on error. So the value you are seeing in errno is either the result of an error in some previous other system call, or errno is just starting out at EINTR and never getting changed (this has happened to me).

 #define handle_error_en(en, msg) \
               do { errno = en; perror(msg); exit(EXIT_FAILURE); } while (0)

s = pthread_create(&tinfo[tnum].thread_id, &attr,
                      &thread_start, &tinfo[tnum]);
if (s != 0)
    handle_error_en(s, "pthread_create");

参考资料

http://man7.org/linux/man-pages/man3/pthread_create.3.html
https://sourceware.org/ml/libc-alpha/2000-10/msg00153.html
http://www.oschina.net/question/234345_40365

本作品采用知识共享署名-非商业性使用-相同方式共享 4.0 国际许可协议进行许可。