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drv_usectohz(9f)
drv_usectohz(9F) Kernel Functions drv_usectohz(9F)
NAME
drv_usectohz - convert microseconds to clock ticks
SYNOPSIS
#include <sys/types.h>
#include <sys/ddi.h>
clock_t drv_usectohz(clock_t microsecs);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
microsecs The number of microseconds to convert.
DESCRIPTION
The drv_usectohz() function converts a length of time expressed in mi‐
croseconds to a number of system clock ticks. The time arguments to
timeout(9F) and delay(9F) are expressed in clock ticks.
The drv_usectohz() function is a portable interface for drivers to make
calls to timeout(9F) and delay(9F) and remain binary compatible should
the driver object file be used on a system with a different clock speed
(a different number of ticks in a second).
RETURN VALUES
The value returned is the number of system clock ticks equivalent to
the microsecs argument. No error value is returned. If the clock tick
equivalent to microsecs is too large to be represented as a clock_t,
then the maximum clock_t value will be returned.
CONTEXT
The drv_usectohz() function can be called from user, interrupt, or ker‐
nel context.
SEE ALSO
delay(9F), drv_hztousec(9F), timeout(9F)
Writing Device Drivers in Oracle Solaris 11.4
NOTES
If the microsecs argument to drv_usectohz() is less than drv_hz‐
tousec(9F), drv_usectohz() returns one tick. This, coupled with multi‐
plication, can result in significantly longer durations than expected.
For example, on a machine where hz is 100, calling drv_usectohz() with
a microsecs value less than 10000 returns a result equivalent to 10000
(1 tick). This type of mistake causes code such as"5000 * drv_usec‐
tohz(1000)" to compute a duration of 50 seconds instead of the intended
5 seconds.
Oracle Solaris 11.4 24 Apr 2008 drv_usectohz(9F)