gb_loopback_async_operation
struct gb_loopback_async_operation *op_async;
struct gb_loopback_async_operation *op_async;
int (*completion)(struct gb_loopback_async_operation *op_async);
retval = gb_loopback_async_operation(gb, GB_LOOPBACK_TYPE_SINK,
struct gb_loopback_async_operation *op_async)
retval = gb_loopback_async_operation(gb, GB_LOOPBACK_TYPE_TRANSFER,
return gb_loopback_async_operation(gb, GB_LOOPBACK_TYPE_PING,