"shared-nothing" does NOT implicitly mean "copy-everything" You can pass an object around between threads with no issues, as long as only one of them owns it a

"shared-nothing" does NOT implicitly mean "copy-everything" You can pass an object around between threads with no issues, as long as only one of them owns it at a time. This is generally the model that is used in practice (although often in functional languages it's hidden under some CoW semantics).