Data processing system including linked functional units

摘要

A data processing system has a number of separate functional elements which transmit and receive data items between the various functional elements. The functional elements may be, for example, separate address spaces or regions running under a single operating system, or separate operating systems running on separate, but linked, data processors. The data processing apparatus includes a link acquisition request (LAR) stack at the requesting element and a LAR stack full processor for selecting one of several alternative actions when the stack has reached a predetermined size as indicated by a stack full indicator.