IBM AS/400 manual Program Management, Program Call, in ILE

			RPG	Programming	in ILE
step process, see	Chapter 7,	“Creating	a	Program	with the CRTRPGMOD and
CRTPGM Commands” on page 73. For		more information on service programs, see
Chapter 8, “Creating	a Service	Program”	on	page 91.

Program Management

ILE provides a common basis for:

¹ Managing program flow

¹Sharing resources

¹ Using application program interfaces (APIs)

¹ Handling exceptions during a program's run time

It gives RPG users much better control over resources than was prev sible.

ILE programs and service programs are activated into activation groups

specified at program-creation time. The process of

getting a

program

program

ready

to

run

is

known as activation. Activation allocates resou

job so that

one

or

more

programs can

run in that

space.

If

the

s

group

for

a

program

does

not exist when the program

is

called, then

within

the

job

to

hold the program's

activation.

An activation

group

is

the

key element

governing an

ILE

application's

re

and behavior. For example, you can scope commitment-control operations t activation group level. You can also scope file overrides and shared paths to the activation group of the running application. Finally, the program upon termination is also affected by the activation group in program runs.

For more information on activation groups, see “Managing Activation Groups” page 109.

You can dynamically allocate storage for a run-time array using the provided for all ILE programming languages. These APIs allow single- and language applications to access a central set of storage management f offer a storage model to languages that do not now provide one. RPG storage management capabilities using operation codes. For more informa storage management, see “Managing Dynamically-Allocated Storage” on page 1

Program Call

In ILE, you can write applications in which ILE RPG programs and OPM programs continue to interrelate through the traditional use of dynami calls. When using such calls, the calling program specifies the name o program on a call statement. The called program's name is resolved to at run time, just before the calling program passes control to the c

You	can also write ILE applications					that can		interrelate with faster
calls	involve	calls		between	procedures.		A procedure is a self-containe
that	performs		a	task and	then returns to the caller. An ILE RPG modu
an optional		main	procedure		followed	by	zero	or more subprocedures.

Chapter 2. RPG Programming in ILE19