DLL Programmer's Guide for TNS/R Systems

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DLLs on a TNS/R System

DLL Programmer’s Guide for TNS/R Systems—522203-002

1-12

User Library

The starting virtual addresses of the program text (code) and data segments are

system constants, set by the linker and enforced by the operating system. The linker

also sets "preferred" virtual addresses for the text and data of DLLs, either by default

or from command-string input. (DLL data immediately follows the text.) If the preferred

address ranges are available at load time (do not conflict with already loaded objects

or reserved areas), they are used; otherwise the operating system finds an available

address range for the DLL.

Like any other DLL, a user library can require other libraries. Figure 1-5 below shows a

user library assigned to program, and this user library itself requires the library Lib H.

Program directly references User Lib and hence indirectly references H. A user library

for PIC programs cannot be an SRL or a hybrid SRL.

You can assign a DLL as a user library to a program when you link or load that

program, or by a special linker command that allows you to change this assignment in

an existing program. More detail is provided in How to Set Run-Time Attributes of Your

Loadfile on page 5-5.

A user library can also be specified at run time:

•

In Guardian, the run-option lib can specify the fully-qualified name of the UL:

/lib $vol.subvol.name/

Alternatively, the option with no name, /lib/, causes any libname attribute in the

program file to be ignored.

Figure 1-5. Loadfiles of Figure 1-4 with a User Lib and Its Library Added

Program

DLL A

DLL B

DLL C

DLL D

DLL E

Lib G

Lib F

Lib A

Lib B

Lib C

Lib F

Lib D

Lib E

Lib F

Lib G

Code

and

Data

libList

VST015.vsd

User Library

(DLL)

Lib H