drv_usectohz(D3)drv_usectohz(D3)NAMEdrv_usectohz - convert microseconds to clock ticks
SYNOPSIS
#include <sys/types.h>
#include <sys/ddi.h>
clock_t drv_usectohz(clock_t microsecs);
Arguments
microsecs The number of microseconds to convert to equivalent clock
ticks.
DESCRIPTIONdrv_usectohz converts the length of time expressed by microsecs, which is
in units of microseconds, into units of clock ticks.
Return Values
The value returned is the smallest number of clock ticks that represent a
time interval equal to or greater than the microsecs argument. No error
value is returned. If the number of ticks equivalent to the microsecs
argument is too large to be represented as a clock_t, then the maximum
clock_t value will be returned.
USAGE
Several functions either take time values expressed in clock ticks as
arguments [itimeout(D3), delay(D3)] or return time values expressed in
clock ticks [drv_getparm(D3)]. The length of a clock tick can vary
across different implementations, and therefore drivers should not
include any hard-coded assumptions about the length of a tick.
drv_usectohz and the complementary function drv_hztousec(D3) can be used,
as necessary, to convert between microseconds and clock ticks.
Level
Initialization, Base or Interrupt.
Synchronization Constraints
Does not sleep.
Driver-defined basic locks, read/write locks, and sleep locks may be held
across calls to this function.
REFERENCESdelay(D3), drv_getparm(D3), drv_hztousec(D3), itimeout(D3)
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