Control Boundaries between OPM and ILE Call Stack Entries

This example shows how control boundaries are defined between ILE call stack entries and OPM call stack entries.

Figure 1 shows three ILE procedures (P1, P2, and P3) running in an OPM default activation group. This example could have been created by using the CRTPGM command or CRTSRVPGM command with the ACTGRP(*CALLER) parameter value. Invocations of procedures P1 and P3 are potential control boundaries because the preceding call stack entries are associated with OPM programs A and B.

Figure 1. Control Boundaries between ILE call stack entries and OPM call stack entries. The shaded procedures are control boundaries.