17.2.2 Useful Publications

Table 35 lists some publications that you may find useful when planning your conversion.

Table 35. Useful Publications

 

Form

Publication Title

Number

 

 

OS/390 Language Environment Migration Guide

SC28-1944

 

 

OS/390 Language Environment Programming Reference

SC28-1940

 

 

OS/390 Language Environment Programming Guide

SC28-1939

 

 

OS/390 Language Environment Concepts Guide

GC28-1945

 

 

OS/390 Language Environment Customization

SC28-1941

 

 

OS/390 C/C++ V2R4.0 Programming Guide

SC09-2362

 

 

Language Environment V1R5 FORTRAN Migration Guide

SC26-8499

 

 

LE/VSE Programming Guide Release 4

SC33-6684

 

 

LE/VSE Programming Guide Release 1

SC26-8065

 

 

LE/VSE Programming Reference Release 4

SC33-6685

 

 

LE/VSE Run-Time Migration Guide Release 4

SC33-6687

 

 

LE/VSE Concepts Guide Release 4

GC33-6680

 

 

LE/VSE Concepts Guide Release 1

GC26-8063

 

 

VSE/ESA Enhancements

SC33-6629

 

 

Taking Advantage of IBM Language Environment for VSE/ESA

SG24-4798

 

 

COBOL for OS/390 & VM Complier and Run-Time Migration Guide

GC26-4764

 

 

IBM PL/I for MVS & VM Compiler and Run-Time Migration Guide

SC26-3118

Release 1.1

 

 

 

OS/390 C++ Compiler and Run-Time Migration Guide

SC09-2359

17.3 Migrating from LE/VSE-Conforming Languages

This section discusses briefly how you can migrate LE/VSE-conforming language applications to OS/390 Language Environment. You should also read 17.5, ªMigrating from LE/VSEº on page359 for more information.

17.3.1 C for VSE/ESA

Even though C for VSE/ESA is an LE/VSE-conforming language, you cannot transfer your C/VSE compiled object code to OS/390, link-edit it and expect it to run. You must recompile it with OS/390 C/C++. However, C/VSE source code is generally compatible with OS/390 C/C++, so your C/VSE programs should compile under OS/390 C/C++ with minimal changes. Refer to 17.4.2, ªC/370º on page 355 for information on migrating your C/VSE applications to OS/390.

Chapter 17. Language Environment (LE) 353

Page 377
Image 377
IBM OS/390 manual Migrating from LE/VSE-Conforming Languages, For VSE/ESA, Useful Publications

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.