RE: Multithreading

Zak,

No actually it is quite easy however there is always a catch! "It depends on
the definition of multi-threading" Do you simply mean running multiple
copies of the program? (If yes, then the only concern is row/record locking
or contention for the same piece of information) if you mean can this one
program process different sets of data at the same time (Yes, no problem) Is
there a need to pass information to the program that might have different
data associated with the same key (If yes then it gets a bit more involved)
In any case the short answer is you can run multiple instances of the same
program at the same time with little difficulty.

Now it sounds like you might be interested in having multiple parts of the
program running concurrently? That would require a bit more work.

I have a sample I can send you that receives instructions via a trigger,
selects it's data and queues the data then places the data in a data queue.
The data queue holds data for multiple instances of the program. The
programs have there own subsystem so we can control how many
instances/threads of  the program that can run. Each instance of the program
gets its data from the data queue using a key.

I hope this is high level enough.

-----Original Message-----
From: Metz, Zak [mailto:Zak_Metz@xxxxxx] 
Sent: Tuesday, June 03, 2003 1:11 PM
To: cobol400-l@xxxxxxxxxxxx
Subject: Multithreading


IANACD*, so I would appreciate high-level replies...
 
My company is interested in converted some existing COBOL programs to
support multiple threads. Based on my research in the "iSeries Multithreaded
Applications" section of the info center and the "ILE COBOL Programmer's
Guide" for v5r2, am I correct in understanding that the extent to which ILE
COBOL supports threading is module serialization? The existing program is
one big module with lots and lots of paragraphs. Would that have to be
broken up into multiple modules to be able to thread the program? Your
"COBOL Threading for Dummies"-style replies are very much appreciated!
 
*(I Am Not A COBOL Developer)
 
Zak Metz
Group 1 Software
iSeries Platform Specialist
IBM Certified Specialist - IBM eServer iSeries Technical Solutions
Implementer
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