What is the primary function of the Processing Program
Table (PPT)?
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Answer Posted / shailesh
PPT - Processing Program Table Contains:
Program name/Mapset name, Language, Size, Main storage
address (if it is loaded), Task Use Counter, Load library
address (address of the load module in the disk), Whether
main storage resident.
Program/Mapset name is unique.
When a transaction id is received by CICS, it gets the
corresponding program name from PCT. Then it checks if the
associated program is already loaded. If so it merely
increases the task use counter for the program by 1 in PPT.
If the program is not loaded, then it gets the load library
address from PPT and loads the program and make the task
use counter 1. Similarly, as tasks complete, the task use
counter of that program is decremented. When the task use
counter becomes zero then CICS may free the main memory
where the load module is loaded, if it has not been
designated as being main‑storage resident.
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