-XBT_PRIVATE simgrid::kernel::activity::IoImplPtr SIMIX_io_start(std::string name, sg_size_t size, sg_storage_t storage);
+XBT_PRIVATE simgrid::kernel::activity::IoImplPtr SIMIX_io_start(std::string name, sg_size_t size, sg_storage_t storage,
+ simgrid::s4u::Io::OpType type);