thr_join，加入特定线程

#include <thread.h>



thread_t tid;

thread_t departedid;

int ret;

void *status;



/* waiting to join thread "tid" with status */

ret = thr_join(tid, &departedid, &status);



/* waiting to join thread "tid" without status */

ret = thr_join(tid, &departedid, NULL);



/* waiting to join thread "tid" without return id and status */

ret = thr_join(tid, NULL, NULL); 

如果 tid 为 (thread_t)0，则 thread_join() 将等待进程中的任何非分离线程终止。换句话说，如果未指定线程标识符，则任何未分离的线程退出都将导致返回 thread_join()。