#include <u.h>#include <libc.h>#include <thread.h>#include "threadimpl.h" static voidlauncher386(void (*f)(void *arg), void *arg){	(*f)(arg);	threadexits(nil);} void_threadinitstack(Thread *t, void (*f)(void*), void *arg){	ulong *tos; 	tos = (ulong*)&t->stk[t->stksize&~7];	*--tos = (ulong)arg;	*--tos = (ulong)f;	t->sched[JMPBUFPC] = (ulong)launcher386+JMPBUFDPC;	t->sched[JMPBUFSP] = (ulong)tos - 8;		/* old PC and new PC */}