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