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Diffstat (limited to 'scripts/atomic/fallbacks/dec_unless_positive')
| -rwxr-xr-x | scripts/atomic/fallbacks/dec_unless_positive | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/scripts/atomic/fallbacks/dec_unless_positive b/scripts/atomic/fallbacks/dec_unless_positive new file mode 100755 index 0000000000..d025361d7b --- /dev/null +++ b/scripts/atomic/fallbacks/dec_unless_positive @@ -0,0 +1,10 @@ +cat <<EOF + ${int} c = raw_${atomic}_read(v); + + do { + if (unlikely(c > 0)) + return false; + } while (!raw_${atomic}_try_cmpxchg(v, &c, c - 1)); + + return true; +EOF |