[Pharo-project] Question about Socket

Hi folks: I am preparing my SqueakDBX talk for ESUG and I am doing some comparisons between a database driver with an external library trough FFI and a native driver. I know FFI locks the VM until the function it is being invoked, finishes. But I don't know what happens with Sockets. Do sockets lock the hole VM until you obtain a response? Thanks for any light in this field. Best, Mariano