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Diffstat (limited to '')
| -rwxr-xr-x | 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 100755 index 000000000..527adec89 --- /dev/null +++ b/scripts/atomic/fallbacks/dec_if_positive @@ -0,0 +1,15 @@ +cat <<EOF +static __always_inline ${ret} +${arch}${atomic}_dec_if_positive(${atomic}_t *v) +{ + ${int} dec, c = ${arch}${atomic}_read(v); + + do { + dec = c - 1; + if (unlikely(dec < 0)) + break; + } while (!${arch}${atomic}_try_cmpxchg(v, &c, dec)); + + return dec; +} +EOF |