Managing Dynamically-Allocated Storage

*=================================================================

* DYNARRAY :

Handle a

(practically)

unbounded run-time

*

Packed(15,0) array.

This

module

contains

*

procedures to allocate

the

array,

return or set

*

an array

value and deallocate the

array.

*=================================================================

H NOMAIN *-----------------------------------------------------------------

* Prototypes for the procedures in this module.

*-----------------------------------------------------------------

/COPY DYNARRI

*-----------------------------------------------------------------

*Interface to the CEEGTST API (Get Heap Storage).

*1) HeapId = Id of the heap.

* 2) Size

= Number of bytes to allocate

*3) RetAddr= Return address of the allocated storage

*4) *OMIT = The feedback parameter. Specifying *OMIT here

*

 

means that we will receive an exception from

*

 

the

API if it cannot satisfy our request.

*

 

Since we do not monitor for it, the calling

*

 

procedure will receive the exception.

*

-----------------------------------------------------------------

 

 

 

D CEEGTST

PR

 

 

 

D

HeapId

 

10I

0

CONST

D

Size

 

10I

0

CONST

D

RetAddr

 

*

 

 

D

Feedback

 

12A

 

OPTIONS(*OMIT)

*

-----------------------------------------------------------------

 

 

 

* Interface to the

CEECRHP API (Create Heap).

*

1) HeapId

=

Id of the heap.

 

 

*

2) InitSize

=

Initial size of

the heap.

*

3) Incr

=

Number of bytes

to increment if heap must be

*

 

 

enlarged.

 

 

*4) AllocStrat = Allocation strategy for this heap. We will

*

 

specify a value

of 0 which allows the system

*

 

to choose the optimal strategy.

*

5) *OMIT

= The feedback parameter.

Specifying *OMIT here

*

 

means that we will receive an exception from

*

 

the API if it cannot satisfy our request.

*

 

Since we do not

monitor for it, the calling

*

 

procedure will receive the exception.

*-----------------------------------------------------------------

 

 

 

 

D CEECRHP

PR

 

 

 

D

HeapId

10I

0

 

 

D

InitSize

10I

0

CONST

D

Incr

10I

0

CONST

D

AllocStrat

10I

0

CONST

D

Feedback

12A

 

OPTIONS(*OMIT)

 

 

 

 

Figure 55

(Part 1

of 2). Global variables and local prototypes for DYNARRAY

Chapter 9. Running a Program121

Page 144 Page 146
Page 145
Image 145
IBM AS/400 manual Copy Dynarri, Ceegtst, Ceecrhp
Page 144 Page 146

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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