RPG Programming in ILE

¹CEEDOD – Decompose Operational Descriptor

Note: You cannot use these or any other ILE bindable APIs from with created with DFTACTGRP(*YES). This is because bound calls are not allowed in this type of program.

For more information on these ILE bindable APIs, see Chapter 9, “Running Program” on page 103 and alsoSystemtheAPI Reference.

Multithreaded Applications

The AS/400 now supports multithreading. ILE

RPG

does

 

not

directly

suppo

ating or managing program threads. However, ILE RPG

procedures

can

r

threads

in

multithreaded

environments.

If

you

want

 

to

call

an

ILE

RP

a multithreaded application, you must ensure that the ILE RPG proce

threadsafe. You must also ensure that any system functions that you

accesses

are

also

threadsafe.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The

THREAD(*SEREALIZE)

control

specification

keyword

can

be

specified

t

you achieve thread safety for an ILE RPG module. Specifying

 

 

THREAD(*SERIALIZE) will protect most of your variables

and

all

 

your

inte

control structures from being accessed

improperly

by

multiple

 

threads

safe module will be locked when a procedure in

the

module

 

is

ente

unlocked when when no procedure in the

module

 

is

still

running.

This

s

access, ensures that only one thread

 

is

active

in

any

one

module,

vation group, at any one time. However, it is

still

up

to

the

progr

thread

safety for

storage

that is

shared

across

modules. This

is

logic in

the

application

to

synchronize

access

to

the

 

storage.

 

 

For

more

information,

see

“Multithreading

Considerations”

on

page 157.

 

Chapter 2. RPG Programming in ILE21

Page 44 Page 46
Page 45
Image 45
IBM manual Multithreaded Applications, AS/400 now supports multithreading. ILE, Does Not Directly
Page 44 Page 46

AS/400 specifications

The IBM AS/400, now known as the IBM iSeries, is a midrange computer system that has been a cornerstone of enterprise computing since its introduction in 1988. Designed to provide a robust platform for business applications, the AS/400 is celebrated for its reliability, scalability, and integrated database capabilities.

One of the key features of the AS/400 is its Integrated Operating Environment, which blends hardware and software resources seamlessly. This integration allows businesses to execute diverse workloads, ranging from traditional applications to modern web-based services, all on a single platform. The operating system, OS/400 (now IBM i), offers a rich set of APIs and tools for developers, simplifying application development and management.

Another standout characteristic of the AS/400 is its built-in database, DB2 for i. This powerful relational database management system allows for efficient data handling and provides advanced features such as support for SQL, XML, and JSON, making it easier for businesses to manage their data and integrate it with other systems. The database's tight integration with the operating system enables high performance and security.

In terms of scalability, the AS/400 can accommodate small businesses as well as large enterprises, with the ability to support hundreds of users simultaneously. Its architecture allows for easy upgrades in hardware, meaning that organizations can scale their systems without replacing the entire infrastructure.

Security is another critical attribute of the AS/400. With a sophisticated security model, it offers built-in user authentication, access control, encryption, and auditing capabilities to protect data and applications from unauthorized access.

The AS/400 also supports multiple programming languages, including RPG, COBOL, Java, and PHP, giving organizations the flexibility to choose the development tools that best fit their needs. This diversity helps maintain legacy applications while also developing new ones that leverage modern technologies.

Moreover, the platform supports both traditional green-screen interfaces and modern graphical user interfaces, allowing organizations to transition smoothly into contemporary user experience paradigms.

Overall, the IBM AS/400 stands out as a resilient, flexible, and secure computing platform that enables organizations to effectively manage their business operations, streamline processes, and adapt to changing market demands. Its unique combination of integrated features and capabilities ensures that it remains relevant in today's fast-paced technology landscape.
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