Re: Subject: RE: AS400....is it really an "Open" system??

Depends on the application, how it was written, what its requirements
are, etc.

A few ways to handle multiple sockets that I've used:

1) Put the socket descriptors into an array.  Use nonblocking sockets and
    the select() API to multitask between all of the connected sockets.
    Naturally, this means you have to keep track of different states
    for every connection, different variables for each one, etc.
    This makes for a complicated program, but it works nicely for 
    1-100 sockets or so.

2) Submit a new job for each client that connects.  You can prestart
    5-10 jobs, and have them waiting on data queues, or on the 
    takedescriptor() API, so your client won't have to wait for the
    job startup time.   (mine wait on data queues so I can do a 
    timeout, then check SHUTDN, then go back to waiting)  This is
    the same type of approach that IBM uses for the FTP server, 
    and I think also for the http server (though they may have 
    changed the way that works)

3) Have your RPG program just deal with one client at a time.   
    (Depending on the requirements of the application, this might
    be the best solution)

Naturally a poorly designed application will be a bottleneck, but I
don't think it particularly matters which language the poorly designed
application is written in :)


On Wed, 11 Apr 2001, Nathan M. Andelin wrote:
>
> How many simultaneous connections does an RPGLE-socket interface support?
> Most socket servers are written in C and use threads to support multiple
> concurrent conversations.  Wouldn't an RPG socket server be a bottleneck?
> 
> Just asking.  Thanks, Nathan.
> 

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