tref.c - plan9port - [fork] Plan 9 from user space
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       tref.c (278B)
       ---
            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 }