scripts/atomic/fallbacks/dec_if_positive

   1 cat <<EOF
   2         ${int} dec, c = raw_${atomic}_read(v);
   3
   4         do {
   5                 dec = c - 1;
   6                 if (unlikely(dec < 0))
   7                         break;
   8         } while (!raw_${atomic}_try_cmpxchg(v, &c, dec));
   9
  10         return dec;
  11 EOF