PF_EXITPIDONE    1026 kernel/exit.c  		tsk->flags |= PF_EXITPIDONE;
PF_EXITPIDONE    1117 kernel/exit.c  	tsk->flags |= PF_EXITPIDONE;
PF_EXITPIDONE     569 kernel/futex.c 		int ret = (p->flags & PF_EXITPIDONE) ? -ESRCH : -EAGAIN;