Language Environment provides a routine called CEELRRTR to terminate library routine retention. However, this routine does not need to be used when running on IMS/TM. If library routine retention is initialized, and the IMS™ Program Control Task is terminated (for example, due to an ABEND), the operating system will free the Language Environment resources as part of task termination. Then when the IMS Program Control Task is reattached, the preinitialization routines get control before IMS scheduling is attempted.

For more information about specifying IMS dependent region preinitialization routines, see IMS/ESA® Customization Guide. For more information about Language Environment library routine retention, see z/OS Language Environment Programming Guide.