/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <thread.h> static Lock l; void_xinc(long *p){ 	lock(&l);	(*p)++;	unlock(&l);} long_xdec(long *p){	long r; 	lock(&l);	r = --(*p);	unlock(&l);	return r;}