Re: Multithreaded Programming

[Jim Langston <jimlangston@xxxxxxxxxxxxxxxx>]

Actually,

I think building subroutines in a library with static variables would
do the same thing as a shared named user space.

Just a though.

Regards,

Jim Langston



Richard Jackson wrote:
> 
> A strict interpretation of multithreading means that the threads have access
> to each other's variable storage in memory.  Obviously there are controls on
> this sharing.  Your description below is for multi - processes and multi -
> threads.  Separate processes cannot access each other's variables.  It may
> not matter to the original requester - but then again it might.  If you use
> separate processes and you want them to share global data, I submit that a
> shared named user space would be a better solution.  There is a "compare and
> swap" or "test and set" function to control concurrent updating.
> 
> Richard Jackson
> (speaking only for myself)
> 
> -----Original Message-----
> From: owner-rpg400-l@midrange.com [mailto:owner-rpg400-l@midrange.com]On
> Behalf Of Rich Duzenbury
> Sent: Wednesday, February 28, 2001 10:42 AM
> To: RPG400-L@midrange.com
> Subject: Re: Multithreaded Programming
> 
> The simplest multithread mechanism I know of is SBMJOB!  Each job can wait
> indefinitely for it's parameters (using little system resources) by waiting
> for a data queue message.  The parent can then signal the child to start
> processing by sending a message to the data queue.  Once the thread is
> complete, the child can end, or if you like go back to waiting for another
> message.  Global data can be safely shared in a data area or a database
> record - you just have to be sure to watch your locking.
> 
> Regards,
> Rich
> 
> At 04:02 PM 2/28/01 +0000, you wrote:
> >Hi All,
> >
> >I need some help on creating an application(RPG/CL) which can use
> >multithreads while running the job.
> >Can anyone give me some direction with examples.
> >
> >thanks in advance,
> >Ray.
> >_________________________________________________________________
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> Regards,
> Rich
> 
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