1 619085f0 2004-12-25 devnull #include "u.h"
 2 619085f0 2004-12-25 devnull #include "libc.h"
 3 619085f0 2004-12-25 devnull #include "thread.h"
 4 619085f0 2004-12-25 devnull 
 5 619085f0 2004-12-25 devnull static long
 6 619085f0 2004-12-25 devnull refadd(Ref *r, long a)
 7 619085f0 2004-12-25 devnull {
 8 619085f0 2004-12-25 devnull 	long ref;
 9 619085f0 2004-12-25 devnull 
10 619085f0 2004-12-25 devnull 	lock(&r->lock);
11 619085f0 2004-12-25 devnull 	r->ref += a;
12 619085f0 2004-12-25 devnull 	ref = r->ref;
13 619085f0 2004-12-25 devnull 	unlock(&r->lock);
14 619085f0 2004-12-25 devnull 	return ref;
15 619085f0 2004-12-25 devnull }
16 619085f0 2004-12-25 devnull 
17 619085f0 2004-12-25 devnull long
18 619085f0 2004-12-25 devnull incref(Ref *r)
19 619085f0 2004-12-25 devnull {
20 619085f0 2004-12-25 devnull 	return refadd(r, 1);
21 619085f0 2004-12-25 devnull }
22 619085f0 2004-12-25 devnull 
23 619085f0 2004-12-25 devnull long
24 619085f0 2004-12-25 devnull decref(Ref *r)
25 619085f0 2004-12-25 devnull {
26 619085f0 2004-12-25 devnull 	return refadd(r, -1);
27 619085f0 2004-12-25 devnull }