diff --git a/postgresql-9.1.9/src/include/storage/s_lock.h b/postgresql-9.1.9/src/include/storage/s_lock.h
index 987fb9c..1ba718c 100644
--- a/postgresql-9.1.9/src/include/storage/s_lock.h
+++ b/postgresql-9.1.9/src/include/storage/s_lock.h
@@ -296,6 +296,29 @@ tas(volatile slock_t *lock)
#endif /* __arm__ */
+/*
+ * On ARM64, we use __sync_lock_test_and_set(int *, int) if available.
+ */
+#if defined(__aarch64__) || defined(__aarch64)
+#ifdef HAVE_GCC_INT_ATOMICS
+#define HAS_TEST_AND_SET
+
+#define TAS(lock) tas(lock)
+
+typedef int slock_t;
+
+static __inline__ int
+tas(volatile slock_t *lock)
+{
+ return __sync_lock_test_and_set(lock, 1);
+}
+
+#define S_UNLOCK(lock) __sync_lock_release(lock)
+
+#endif /* HAVE_GCC_INT_ATOMICS */
+#endif /* __aarch64__ */
+
+
/* S/390 and S/390x Linux (32- and 64-bit zSeries) */
#if defined(__s390__) || defined(__s390x__)
#define HAS_TEST_AND_SET