Procedures to follow in writing exit routines

Figure 1 summarizes addressability and save-area requirements for the mainline program and exit routines. In most cases, LERAD and SYNAD exit routines do not have to be reentrant. See Figure 2 for those cases. See Figure 3 for the situations in which exit routines must be reentrant.

Figure 1. Summary of addressability and save-area requirements for the mainline program

The diagram summarizes addressability and save-area requirements for the mainline program and exit routines.

Figure 2. Situations in which LERAD and SYNAD exit routines do not have to be reentrant

The diagram shows situations in which LERAD and SYNAD exit routines do not have to be reentrant. It contains two situations: only the mainline program issues RPL-based requests and only asynchronous exit routines issue RPL-based requests.

Figure 3. Situations in which LERAD and SYNAD exit routines must be reentrant

The diagram shows situations in which LERAD and SYNAD exit routines must be reentrant.