pthreadlist
pthreadlist _thread_list = TAILQ_HEAD_INITIALIZER(_thread_list);
pthreadlist _thread_gc_list = TAILQ_HEAD_INITIALIZER(_thread_gc_list);
extern pthreadlist _thread_list;
extern pthreadlist _thread_gc_list __hidden;
typedef TAILQ_HEAD(pthreadlist, pthread) pthreadlist;