Guardian Application Conversion Guide

Conversion Considerations and the Common Run-Time Environment (CRE)
Conversion Concepts
2–20 096047 Tandem Computers Incorporated
For programs that contain C, COBOL85, FORTRAN, and Pascal routines but do not
contain TAL routines, no changes are required to run in the CRE. There are no
changes in execution, except perhaps the text and format of run-time diagnostic
messages in C and Pascal, which come from the CRE error-reporting routines.
For programs that contain TAL procedures, you must change calls from Guardian
procedures to CRE library routines to perform actions on those objects, such as the
standard files, that you want to share or coordinate with other languages. TAL
routines can continue to use Guardian procedure calls for resources that are not
shared. In addition, TAL routines cannot directly manipulate the upper 32K of the
run-time heap. The CRE uses this area to store its data.