_thr_find_thread
if ((rval = _thr_find_thread(curthread, pthread,
if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0) {
if ((ret = _thr_find_thread(curthread, thread, include_dead)) == 0) {
int _thr_find_thread(pthread_t, pthread_t, int);