refcount.c

   1 #include "bits/callback.h" // for SingleCallback
   2 #include "refcount.h"
   3
   4 void refcount_ini(Refcount *refcount, void *obj, void *del)
   5 {
   6         refcount->obj = obj;
   7         refcount->del = del;
   8         refcount->cnt = 1;
   9         pthread_mutex_init(&refcount->mtx, NULL);
  10 }
  11
  12 void refcount_dst(Refcount *refcount)
  13 {
  14         pthread_mutex_destroy(&refcount->mtx);
  15 }
  16
  17 void *refcount_inc(Refcount *refcount)
  18 {
  19         pthread_mutex_lock(&refcount->mtx);
  20         refcount->cnt++;
  21         pthread_mutex_unlock(&refcount->mtx);
  22         return refcount;
  23 }
  24
  25 void *refcount_grb(Refcount *refcount)
  26 {
  27         return refcount_obj(refcount_inc(refcount));
  28 }
  29
  30 void refcount_drp(Refcount *refcount)
  31 {
  32         pthread_mutex_lock(&refcount->mtx);
  33         unsigned short count = --refcount->cnt;
  34         pthread_mutex_unlock(&refcount->mtx);
  35
  36         if (!count)
  37                 ((SingleCallback) refcount->del)(refcount->obj);
  38 }
  39
  40 void *refcount_obj(Refcount *refcount)
  41 {
  42         return refcount->obj;
  43 }