+int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id);
+ExecRuntime *exec_runtime_ref(ExecRuntime *r);
+ExecRuntime *exec_runtime_unref(ExecRuntime *r);
+
+int exec_runtime_serialize(ExecRuntime *rt, Unit *u, FILE *f, FDSet *fds);
+int exec_runtime_deserialize_item(ExecRuntime **rt, Unit *u, const char *key, const char *value, FDSet *fds);
+
+void exec_runtime_destroy(ExecRuntime *rt);
+