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