I need it for a device. The device performs some operation in a loop but I cannot wait in that loop forever, so I need to wait for the maximum time I can (2 clock ticks) before giving up on the device. Interrupts may be disabled so I cannot use jiffies. Any simple solution would be appreciated. Regards, Asim On 3/6/09, Raz <raziebe@xxxxxxxxx> wrote: > I implemented a timer that can operate without interrupts. but it > relies on smp or smt. > what do you need it for ? > > On Fri, Mar 6, 2009 at 5:08 PM, Greg Freemyer <greg.freemyer@xxxxxxxxx> > wrote: >> On Fri, Mar 6, 2009 at 9:59 AM, Asim <linkasim@xxxxxxxxx> wrote: >>> Yes - Actually I need to wait for a device to finish something after >>> which I(device) error out. Ideally, I would like a simple >>> function using the standard apis that works on most kernels. I cannot >>> use jiffies as I mentioned earlier. Still working on it. >>> >>> -Asim >> >> In general the idea of waiting 2 whole ticks with interrupts disabled >> is such a bad idea that I don't think you will find a pre-existing API >> to do that. >> >> You definitely will not be able to simply check a variable because >> with interrupts disabled, their is no one to update the variable. >> >> If you really need this, you will likely need a call into a routine >> the gets the current time from a hardware clock. >> >> IMHO, such misbehaving code will never get into mainline and is not >> even a good learning experience. >> >> Greg >> -- >> Greg Freemyer >> Litigation Triage Solutions Specialist >> http://www.linkedin.com/in/gregfreemyer >> First 99 Days Litigation White Paper - >> http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf >> >> The Norcross Group >> The Intersection of Evidence & Technology >> http://www.norcrossgroup.com >> >> -- >> To unsubscribe from this list: send an email with >> "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx >> Please read the FAQ at http://kernelnewbies.org/FAQ >> >> > -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
