Re: Calling application pgms from threaded web services

On 2023-11-22 4:53 p.m., Rick Rauterkus via RPG400-L wrote:

I have been playing around with Apache and ILEastic to set up a web service
that will call a process in our existing application. I have both of them
working, but have a question on threads.

ILEastic says the RPG programs have to be compiled with
Thread(*Concurrent). I did that with the front end program I created for
the ILEastic server, but do I need to do that with all the programs in the
existing application that could be called by this process also? None of
the existing programs will use the ILEastic procedures at all. I see
ILEastic includes il_exitThreadSerialize and il_enterThreadSerialize
procedures, but I cannot find anything on how or if they should be used.

If you are running in a multi-thread environment, everything you call should be thread-safe. If you are calling something that can't be made thread-safe, you have to make sure they are only called by one thread at a time.

*CONCURRENT means that multiple threads can be running in your module at the same time, which means that multiple threads could call any other programs in your application at the same time.

So any other RPG programs and service programs called from your application, and anything THEY call, should also have the THREAD keyword, either *CONCURRENT or *SERIALIZE.