Allocation of resources to operator windows

GDDM V3R2 Base Application Programming Guide

Allocation of resources to operator windows

GDDM V3R2 Base Application Programming Guide
SC33-0867-01

When operator windows are used to run several independent programs at the same time on the same device, more than one program may try to use the same PS store. In this case, of the operator windows requiring the PS store, the one that has the highest viewing priority uses it, and the others use the default PS store. This sharing of PS stores is transparent to the program.

On devices like the 3279, GDDM uses programmed symbols for graphics, and to draw the borders around operator windows. The PS stores are allocated in the following order:

Symbol sets reserved by the application for the active operator window
Graphics in the active operator window
The borders of all operator windows
Symbol sets and graphics for non-active operator windows.

If you have a number of operator windows containing graphics, that are to be displayed on the screen at the same time, PS overflow can occur. In this case, GDDM guarantees picture fidelity for the active operator window only, and may have to degrade the appearance of borders and picture fidelity for non-active operator windows.

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