CMS Application Multitasking has been an integral part of CMS since CMS
level 9 (VM/ESA Version 1 Release 2.0); however, many CMS programmers,
particularly REXX programmers, have not yet learned how to take
advantage of the highly significant and useful functions, such as event,
queue and timer services, that this suite of APIs provides. The reasons
that these function are often overlooked, even by experienced CMS
developers, are varied but include:
- user group presentations about the capabilities have generally
focused on writing servers
- the belief that these functions are useful only for multitasking
applications
- perceived difficulty using CSLs, especially from REXX
The intent of this redbook is to provide an approachable, introductory
user's guide that addresses these concerns by offering both tutorial
information on the capabilities and useful sample programs that
installations can readily adapt to meet local needs. To insure that the
information presented is accessable to the widest possible audience, the
examples provided are written in REXX. We believe, however, that the
information presented will also be useful to developers writing in other
languages. When you have finished reading this material, you will be
able to recognise where these APIs can be usefully applied, both for
enhancing existing applications or developing new ones, whether
multithreaded or not.
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