Modifying Action Diagrams › Understanding Shared Subroutines

Understanding Shared Subroutines

The main objective of shared subroutines is to optimize the generation of internal functions that are implemented as subroutines. The first instance of generated source for the function is reused for all subsequent calls to the function within an action diagram instead of being repeatedly regenerated. These changes apply to CHGOBJ, CRTOBJ, DLTOBJ, RTVOBJ, and EXCINTFUN function types.

Some advantages of shared subroutines are:

• The volume of source code is reduced and therefore programs generate faster.
• Fewer subroutines result in smaller and therefore faster executing programs.
• Moving the interface outside shared subroutines facilitates changes required for ILE (Integrated Language Environment) generation.