HP 3000 Manuals HP 3000 Manuals
Segmented and Executable Libraries
Executable libraries on MPE XL systems are similar to segmented libraries
(SLs) on MPE V systems. Executable libraries contain executable code
that is used by the loader at run time to resolve external references.
Modules in executable and segmented libraries are shared by programs
running concurrently.
The following list summarizes the similarities between the MPE V
Segmenter commands that manage segmented libraries and the HP Link
Editor/XL commands that manage executable libraries:
* The ADDSL command adds code units to a segmented library and the
ADDXL command adds code units to an executable library.
* The BUILDSL command creates a segmented library and the BUILDXL
command creates an executable library.
* The COPYSL command copies one segmented library to another and the
COPYXL command copies one executable library to another.
* The LISTSL command lists the contents of a segmented library and
the LISTXL command lists the contents of an executable library.
* The PURGESL command deletes code units from a segmented library
and the PURGEXL command deletes code units from an executable
library.
Although executable and segmented libraries are similar, executable
libraries provide more power and flexibility in managing executable code.
The following list summarizes the differences between these libraries:
MPE V Segmenter HP Link Editor/XL
* Segmented libraries must have the * Executable libraries can have any
name SL. valid MPE XL file name.
* Using the LIB= parameter, you can * Using the LIB= and XL= parameters of
search up to three segmented the LINK command, you can search any
libraries. number of executable libraries at
run time.
* You can add only one segment to a * Using ADDXL, you can add one or more
segmented library using the ADDSL modules (from an executable program
command. file or from one or more relocatable
libraries) to an executable library.
* You cannot use relocatable libraries * When adding modules to an executable
to resolve external references when library using the ADDXL command, you
adding modules to a segmented can use relocatable libraries to
library. resolve external references.
* You cannot merge modules when adding * When adding modules to an executable
them to a segmented library. library using the ADDXL command, you
can merge one or more modules into
one.