On Sat, Apr 2, 2011 at 7:03 AM, Sahananda (Jon) Wolfers < sahana...@windhorse.biz> wrote:
> I have a question, and I hope it is ok to ask it here. > > It has been brought up by my struggle to move my work to 4.0, but if solved > for me could benefit many people. > > > > My specific problem is about managing to use rexx/sql with ooRexx 4.0 in a > multithreaded environment, but it might b better if I ask the list a more > general question. > > > > That is, where one has to provide one’s applications with a service that > continuously runs, what is the best way to set it up, use it and tear it > down. This question has become more important in 4.0, because there used > to be a loophole in ooDialog that allowed one to run methods on the ‘main’ > thread of a dialog. Now that has gone, it needs to be done properly. > > > > So for me, because rexx\sql needs to run on the thread that the library was > loaded on, I have built a little server, I queue message objects on the > server, and it performs them on the correct thread. That all works very > well. My problem pertains to how to set it up when it is first needed, > and tear it down when it is finished with. > Well, as always questions like this are hard to answer without knowing what your code is doing. But, one approach comes directly from what you say above. If you are queueing messages to the server, just define a special message that means "shut down". Then when your application is terminating, send it that message. I doubt that there is any one "right" way to do this. Another approach is to have some variable that the server checks each time it enters its processing loop. If the variable is true, it drops out of the loop and the thread terminates. Then when the application is terminating you set the varible and manually force the server to check if it needs to process something. Again, I'd suggest looking at the sysinfo.rex example in trunk. It solves a problem that seems to be similar to yours, every use of OLE has to be done on the same thread. main\samples\windows\oodialog\sysinfo -- Mark Miesfeld
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