Re: 5250 Data Stream + Async I/O

[benji@xxxxxxxxxxxxxxxx]

Thank You all for the comments and 5250 sample code. Now I have another
question. Actually it is not my question, but one of my friends coming from
VAX/VMS. He was looking for async I/O on the 400, but found nothing. By
async I/O we mean that your code sends the I/O request, and gets
interrupted when the I/O completes. In VMS nearly every I/O operation has
an asynchronous and a synchronous version. If you choose the async version,
your program gets interrupted and the I/O handler routine specified by the
programmer takes control. You don't have to wait for the I/O to complete or
wait for a notification that you can perform I/O. The closest thing I found
on the AS/400 was the SIGIO signal for sockets (which is POSIX, not AS/400
specific). BTW POSIX provides async I/O, but it's not widespread yet -
OS/400 does not support POSIX aio_ functions either. Does OS/400 provide
async I/O for application developers (system programmers)?

Regards,

     Benjamin Budai


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