Table 40. DOS PL/I Migration Considerations
Migration
Consideration
Comments
Dumps The output produced by PLIDUMP is different when running
under OS/390 Language Environment.
Condition Handling In general, PL/I condition handling continues to function in
the same way when running under OS/390 Language
Environment; however, you should consider the following:
•
The ERRCOUNT run-time option specifies how many
conditions of severity 2, 3, and 4 can occur before the
enclave terminates abnormally. The IBM-supplied
installation value for the ERRCOUNT run-time option is
ERRCOUNT(20). This value is not suitable for all PL/I
applications. To ensure that your application behaves
correctly, and is compatible with DOS PL/I behavior,
specify ERRCOUNT(0).
•
The diagnostic message for an ERROR condition is
issued only if there is no ERROR ON-unit established,
or if the ERROR ON-unit does not recover from the
condition by using a GOTO out of block. However, for
other PL/I conditions whose implicit action includes
printing a message and raising the ERROR condition,
the message is issued before control is given to an
established ERROR ON-unit.
Run-Time Message
Output - SYSPRINT
OS/390 Language Environment directs run-time message
output from PL/I programs to the file specified by the
OS/390 Language Environment MSGFILE run-time option,
instead of to the PL/I SYSPRINT file. User-specified output
is still directed to the PL/I SYSPRINT file. If you want
OS/390 Language Environment to handle this output,
specify the run-time option MSGFILE(SYSPRINT). When you
specify MSGFILE(SYSPRINT), SYSPRINT contains both
run-time messages and user-specified output.
Format and Content
of Messages in PL/I
The format and content of run-time messages is different
for PL/I applications running with OS/390 Language
Environment. If you have applications that analyze run-time
output, you should change them. Differences include:
•
The message number in the message prefix is now four
digits instead of three digits.
•
The message severity in the message prefix can now
be I, W, E, S, or C.
•
The message text of some mixed-case English and
Japanese messages has been enhanced.
DEPTHCONDLMT
Option
The default setting for the DEPTHCONDLMT option, both for
CICS and non-CICS, is DEPTHCONDLMT(10). The
recommended setting for PL/I applications, for compatibility
with DOS PL/I, is DEPTHCONDLMT(0).
Storage Report The format of the run-time storage report generated by the
OS/390 Language Environment RPTSTG run-time option is
different than the format of the storage reports produced
by the DOS PL/I REPORT run-time option.
Chapter 17. Language Environment (LE) 357
