CICS/400 includes a number of functions that control the running of your transactions:
The CICS/400 task control facility initiates transactions, controls resources at syncpoint and task end, and serializes access to resources.
– OS/400 functions for program loading
– CICS/400 commands for handling transfer of control between programs
– CICS/400 commands for loading and unloading data tables and maps
CICS/400 commands are used for condition handling in CICS/400 application programs. The source code translator adds code to translated programs to trap machine event errors.
The storage management component of CICS/400 provides the support to manage system and user, shared and nonshared, main storage for both internal CICS/400 and user application requirements. User application requirements are supported by the CICS/400 API commands. Shared CICS resources are used and managed through use of shared user spaces within the control region and the OS/400 data queues.
CICS uses two types of storage:
– Shared storage, which is accessible across many CICS address spaces and contains common data that is needed by CICS service and user application modules.
– Nonshared storage, which is accessible only to an individual CICS address space and contains data that is specific to that address space.
CICS/400 routines create and manage dynamically-acquired main storage areas, track available storage within the appropriate storage environment, and ensure that storage requests are serviced. These CICS/400 routines interface with OS/400 facilities for the creation and release of temporary space objects.
CICS/400 interval control is used to extract date and time information for application programs and to delay the starting of a transaction.
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