Messages in this thread |  | | Subject | delaying "milliseconds" in the kernel | Date | Tue, 06 Nov 2001 16:16:18 -0500 | From | "Marty Leisner" <> |
| |
I'm writing a driver, and want to delay n milliseconds in an algorithm.
Timers need jiffies, so I need to convert.
Is there a standard to define time? (I didn't see it -- seems everything is in HZ).
I wanted a macro or something so I could express my constraint in milliseconds, and it would be converted to jiffies...
I wanted something like a macro: #define MSECS_TO_JIFFIES(x) (x*(HZ/1000))
It seems there is no "standard" way to do this in the kernel (I ran gid on 2.4.5).
The only think I easily saw was: drivers/isdn/sc/hardware.h:112:#define milliseconds(x) (x/(1000/HZ)) which would do what I wanted...I would want to see this at a higher level...
Instead of throwing around HZ everywhere (and having to inuitate how this mapped time to jiffies), would it be a good idea to have some standard way to express milliseconds -- since time is important, jiffies are an implementation detail.
I think the code would be much clear if I saw MSECS_TO_JIFFIES(250) instead of (HZ/4)
Just IMHO
marty mleisner@eng.mc.xerox.com Don't confuse education with schooling. Milton Friedman to Yogi Berra - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |