17.5.1.2 Run-time Options and LE/VSE 1.4 and Later Releases

The following options were introduced in LE/VSE 1.4, but their usage in OS/390 Language Environment is sometimes different. They were not available in LE/VSE 1.1.

ARGPARSE

This option only applies to C and can only be specified with the

 

C #pragma runopts directive. #pragma runopts is not available with

 

C++ so you should change your application to use the C++

 

ARGPARSE compiler option.

EXECOPS

This option only applies to C and can only be specified with the

 

C #pragma runopts directive. #pragma runopts is not available with

 

C++ so you should change your application to use the C++

 

EXECOPS compiler option.

ENV

This option only applies to C and can only be specified with the

 

C #pragma runopts directive. #pragma runopts is not available with

 

C++ so you should change your application to use the C++

 

TARGET(IMS) compiler option.

HEAPCHK

HEAPCHK was not available in LE/VSE 1.1. It is available in

 

LE/VSE releases later than 1.4, and in LE/VSE 1.4 via APAR

 

PQ08538. HEAPCHK has the same behaviour in OS/390

 

Language Environment as in LE/VSE, and is described in

 

VSE/ESA Enhancements, and in the OS/390 Language

 

Environment Programming Reference.

PLIST

This option only applies to C and can only be specified with the

 

C #pragma runopts directive. #pragma runopts is not available with

 

C++. The behavior of C applications with PLIST(HOST) in effect

 

is the same for C++ .

REDIR

This option only applies to C and can only be specified with the

 

C #pragma runopts directive. #pragma runopts is not available with

 

C++ so you should change your application to use the C++

 

REDIR compiler option.

RETZERO

The RETZERO option is a VSE-only option and not available in

 

OS/390 Language Environment. It applies only to COBOL

 

applications. If you are using it in your applications you should

 

remove it. This may mean you need to make coding changes to

 

accommodate invalid values in the RETURN-CODE special

 

register.

 

If you include the RETZERO option in your OS/390 application,

 

you will receive message:

 

CEE3611I The run-time option RETZERO was an invalid run-time option

 

Note: RETZERO is available in LE/VSE releases later than 1.4,

 

and in LE/VSE 1.4 via APAR PQ04876.

TRACE

With OS/390 Language Environment there are two more values

 

for the sub-option LE. They are LE=2 and LE=3.

362VSE to OS/390 Migration Workbook

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IBM OS/390 manual Run-time Options and LE/VSE 1.4 and Later Releases, Argparse

OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.