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-rwxr-xr-xscripts/atomic/fallbacks/fetch_add_unless10
1 files changed, 10 insertions, 0 deletions
diff --git a/scripts/atomic/fallbacks/fetch_add_unless b/scripts/atomic/fallbacks/fetch_add_unless
new file mode 100755
index 0000000000..8db7e9e17f
--- /dev/null
+++ b/scripts/atomic/fallbacks/fetch_add_unless
@@ -0,0 +1,10 @@
+cat << EOF
+ ${int} c = raw_${atomic}_read(v);
+
+ do {
+ if (unlikely(c == u))
+ break;
+ } while (!raw_${atomic}_try_cmpxchg(v, &c, c + a));
+
+ return c;
+EOF