[uClinux-dev] Re: question about Interrupt handler
tom at cyberiansoftware.com
Mon Nov 26 14:27:29 EST 2001
Vladimir Vorobyov wrote:
> > Fundamentally it is a bad thing to do. What if the app dies for some
> > reason? The interrupt could be writing into someone else memory space.
> > What if one day you want to switch to a VM processor?
> OK, but if I need to perform asynchronous reading:
> Buffering data within driver will be useless.
> Writing from interrupt handler happens only after application has called
> read function.
> 1) application calls read
> 2) driver initializes reading sequence and returns
> 3) application does some computations
> 4) application polls driver (or calls IOCTL) to check for completion of data
> transfer and goes to 1)
> how can I avoid writing to user space ?
This is starting to sound more like a question as to how to design the
system itself instead of a specific problem resolution. You seem to
have determined a strategy for how your program will interact with the
unspecified hardware and are now attempting to warp/bend uClinux around
that strategy. I submit that your strategy itself may be flawed,
perhaps you should step back and rethink how the device will
interact/relate to the microprocessor and uClinux.
The solution to your design problem may be quite different than the
approach that you have decided to take, this time?
Tom Walsh - WN3L - Embedded Systems Consultant
"Windows? No thanks, I have work to do..."
This message resent by the uclinux-dev at uclinux.org list server http://www.uClinux.org/
More information about the uClinux-dev