Re: Port LPT + ADA (whta do I wrong?)

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On Tue, 7 Dec 2004 20:28:11 -0800, Steve wrote:

> Before using OVERLAPPED operations I found the little ideosyncracy that if I 
> had one thread waiting on a read, another thread couldn't do a write until 
> the read finished.  Using overlapped the write causes the read to wake up, 
> the write does it's thing.  When my code detects that the read hasn't 
> finished, it goes back and reads again.  A pain in the butt, but it works.
>
> I remember finding an article on Microsofts site describing overlapped I/O 
> and how it was a new and special feature that they had implemented.  That 
> was news to me since I have written communications applications on other 
> operating systems where you don't have to do anything special to have a read 
> task and a write task work on the same communications port.

For those who knew RSX-11 and VMS overlapped I/O is quite natural. In fact
when I first saw how UNIX SysV dealt with full duplex stuff I was upset!

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de