[MiNT] sleep() and wake() in device drivers

[Jonathan Oddie <oddie@babylonia.flatirons.org>]

Hello,

I am writing a "device driver" so as to be able to access the modem and printer
ports from MacMiNT. I think I have this mostly figured out, except for one 
thin; I want to use asynchronous execution for reading and writing (as 
synchronous execution can lock up the whole machine), but this means that
unless the device was opened with O_NDELAY flag, I have to put the calling
process to sleep and wake it again upon completion of the IO. I know that
sleep() and wake() from the kerinfo struct are used for this, but I couldn't
quite figure out from the source how they are used. My best guess is something
like this:
long busy;

busy = 1;
/* here would go Toolbox call to do the actual IO, with a pointer to a 
	completion routine that sets busy = 0 */
sleep(IO_Q,&busy);

So do I need the wake() call at all, or is it simply enough for the IO
completion routine (called when it has actually finished) to set busy = 0? I'm
a bit confused...

Thanks for any help,
Jonathan

p.s. I'm still trying to set up the gcc cross-compiler... it *does* build the
actual xgcc binary, but then dies when trying to reconfigure itself to build
`libio'... I'll keep trying though