Basic System Problem Analysis - August 2003

Job/Session Management Structures

The JMAT or job master table is what is displayed with the SHOWJOB CI command and

there is an equivalent OS macro UI_SHOWJOB. Like its CI counterpart the macro

displays all jobs and sessions or will display a specific job or session when a string with

the “#Jnnn” or “#Snnn” value is supplied.

The JIT and JDT are compatibility mode data segments (DST) but all CM DST’s are

objects and have NM virtual addresses. The DSTVA function translates a CM data

segment number to its NM virtual address equivalent.

The JIT and JDT DST’s are kept in the CM stack in the “PXGLOBAL” area which is

more easily remembered as being the first 12 (decimal) 16 bit words. So the quickest way

to find the JIT and JDT are to dump the CM stack of the process you want them for.

$1de ($21d) nmdat > cm

%737 (%1035) cmdat > dd sdst.0,#12

DST %40346.0

%0 % 000450 000600 137677 005700 003461 000000 020400 000000

%10 % 040001 040000 040332 040330