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

     drv_usectohz()  converts  a  length  of  time  expressed  in
     microseconds  to   a number of system clock ticks.  The time
     arguments to  timeout(9F) and  delay(9F)  are  expressed  in
     clock ticks.

     drv_usectohz() is a portable interface for drivers  to  make
     calls  to timeout(9F) and delay(9F) and remain binary compa-
     tible 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

     drv_usectohz() can be called from user or interrupt context.

SEE ALSO

     delay(9F), drv_hztousec(9F), timeout(9F)

     Writing Device Drivers