IBM Z Workload Scheduler interface component

The IBM Z Workload Scheduler subsystem interface component consists of:

The IBM Z Workload Scheduler SSVT. The SSVT is built by the EQQINITP module during the master scheduler initialization and is located in key zero, CSA storage (subpool 241).
The modules that implement the passing of a request from the caller address space to the IBM Z Workload Scheduler address space. These routines are located in the EQQSSCMP module.

An SSVT can support up to 256 function calls. The IBM Z Workload Scheduler SSVT supports two function calls. The first call is issued by IBM Z Workload Scheduler dialogs; the second is used by event-tracking exits.

z/OS and JES exits supplied with IBM Z Workload Scheduler request service by directing the SSI request to the MSTR subsystem. These function calls cause the master subsystem to invoke all defined subsystems.