CRE Programmer's Guide

Introducing the CRE
Common Run-Time Environment (CRE) Programmer’s Guide—528146-004
1-7
Selecting a Run-Time Environment
Refer to Section 3, Compiling and Binding Programs for the TNS CRE, and Section 4,
Compiling and Linking Programs for the Native CRE, for details. Refer to Writing TAL
Routines That Use the TNS CRE on page 2-6 for additional restrictions for TAL
routines running in the TNS CRE.
pTAL routines linked into a program with a native C or native COBOL main routine can
run in the CRE. (The native C or native COBOL main routine ensures that the correct
CRE library initialization and termination functions are called.) Refer to Writing TAL
Routines That Use the TNS CRE on page 2-6 for additional restrictions for pTAL
routines running in the native CRE.
Table 1-3 on page 1-8 compares the languages supported by the TNS CRE and the
TNS/R or TNS/E native CRE.
pTAL
(TNS/R)
Yes; calls from
system routines to
CRE library
functions to
perform actions on
those objects,
such as the
standard files, that
you want to share
or coordinate with
other languages
No Yes No No
TAL (TNS) Yes; calls from
system routines to
CRE library
functions to
perform actions on
those objects,
such as the
standard files, that
you want to share
or coordinate with
other languages
Only if a
compiler
directive is
specified
Yes No Yes, if
changed to
make calls
to specific
CRE library
initialization
and
termination
functions
Table 1-2. Requirements for Running in the CRE (page3of3)
Primary
language or
compiler
used for the
program
Need to make
source changes?
Must be
compiled
to run in
the CRE?
Can use
system
procedure
calls for
resources
that are not
shared?
What
changes in
execution?
Can
contain a
main
routine?