On Tue, 2007-07-03 at 15:22 -0500, Patrick O'Keefe wrote: > I found an old draft copy of an early PLI/F Reference > manual and taught myself PL/I. I was never really > proficient, and never tried esoterica like its > subtask (synchronous processing) support
Event variables were annoying in those days. I remember that you couldn't test an event variable - essentially an ECB - for COMPLETION() if it was associated with a DISPLAY...REPLY statement. The event wouldn't post complete until you waited on it. It wasn't possible to issue a message to the operator and check back every so often to see if you'd gotten a reply. You could resort to multitasking, but then you couldn't be an IMS application. Multitasking caused the PL/I main prologue to initiate a root task which would in turn ATTACH your own main task. Due to the design of IMS, the TCB that was given control in a dependent region had to be the same TCB that issued PLITDLI calls. So no IMS for me! -- David Andrews A. Duda and Sons, Inc. [EMAIL PROTECTED] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
