diff options
Diffstat (limited to 'scripts/atomic/fallbacks/dec_unless_positive')
| -rwxr-xr-x | scripts/atomic/fallbacks/dec_unless_positive | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/scripts/atomic/fallbacks/dec_unless_positive b/scripts/atomic/fallbacks/dec_unless_positive new file mode 100755 index 000000000..dcab6848c --- /dev/null +++ b/scripts/atomic/fallbacks/dec_unless_positive @@ -0,0 +1,14 @@ +cat <<EOF +static __always_inline bool +${arch}${atomic}_dec_unless_positive(${atomic}_t *v) +{ + ${int} c = ${arch}${atomic}_read(v); + + do { + if (unlikely(c > 0)) + return false; + } while (!${arch}${atomic}_try_cmpxchg(v, &c, c - 1)); + + return true; +} +EOF |