Customer information control system application programming interface, with global and local system and file control functions, in a loosely coupled data processing environment

摘要

The invention a customer information control system (CICS) application programming interface (API), with global and local system and file control functions, in a loosely coupled data processing system environment. In accordance with the purpose of the invention, as embodied and broadly described herein, the invention is directed to a method, system and computer readable medium for the local system and files control (hereafter collectively referred to as the “invention”). In particular, the invention includes implementing a loosely coupled CICS region in a data processing environment, the loosely coupled CICS region includes at least two of a plurality of machines and their respective address spaces. The invention further includes allocating a flat segment in the address space of the at least two machines. The invention additionally includes providing a keeper in the address space of each of the at least two machines, one of the keepers being designated as a master keeper. Furthermore, the invention includes providing more than one CICS-API operating system server (COSS) within the loosely coupled CICS region, each COSS residing in one of the at least two address spaces within the loosely coupled CICS region. The invention also includes providing in each COSS a suite of functions including the global and local system and file control functions so that each COSS is capable of registering as a flat segment user and interfacing with a keeper and a master keeper, and so that each COSS being further capable of interfacing via the keeper with the master keeper in another of the at least two machines. Each COSS is also capable of coordinated interaction with any other COSS within the loosely coupled CICS region. The suite of functions offer direct access to system and data resources from anywhere within the loosely coupled CICS region. Consequently, there is no system or data resource affinity between the address space in which each COSS is operating and the address space being occupied by the system and data resources.