#include <lib9.h>#include <draw.h>#include "dat.h"#include "fns.h" voidaddreq(Reqbuf *reqs, void* r){	reqs->r[reqs->wi] = r;	reqs->wi++;	if(reqs->wi == nelem(reqs->r))		reqs->wi = 0;	if(reqs->wi == reqs->ri)		sysfatal("too many queued reads");} void*nextreq(Reqbuf *reqs){	void *r; 	r = reqs->r[reqs->ri];	reqs->ri++;	if(reqs->ri == nelem(reqs->r))		reqs->ri = 0;	return r;}