diff options
Diffstat (limited to 'scripts/atomic/fallbacks/dec_if_positive')
| -rw-r--r-- | scripts/atomic/fallbacks/dec_if_positive | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/scripts/atomic/fallbacks/dec_if_positive b/scripts/atomic/fallbacks/dec_if_positive new file mode 100644 index 000000000000..c52eacec43c8 --- /dev/null +++ b/scripts/atomic/fallbacks/dec_if_positive @@ -0,0 +1,15 @@ +cat <<EOF +static inline ${ret} +${atomic}_dec_if_positive(${atomic}_t *v) +{ + ${int} dec, c = ${atomic}_read(v); + + do { + dec = c - 1; + if (unlikely(dec < 0)) + break; + } while (!${atomic}_try_cmpxchg(v, &c, dec)); + + return dec; +} +EOF |