--- /dev/null
+/*
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+#ifndef MSGPACK_GCC_ATOMIC_H
+#define MSGPACK_GCC_ATOMIC_H
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+typedef int _msgpack_atomic_counter_t;
+
+int _msgpack_sync_decr_and_fetch(volatile _msgpack_atomic_counter_t* ptr);
+int _msgpack_sync_incr_and_fetch(volatile _msgpack_atomic_counter_t* ptr);
+
+
+#if defined(__cplusplus)
+}
+#endif
+
+
+#endif // MSGPACK_GCC_ATOMIC_H