MSTOHZ(9) BSD Kernel Developer's Manual MSTOHZ(9)NAME
mstohz, hztoms -- convert between milliseconds and system clock ticks
SYNOPSIS
#include <sys/param.h>
int
mstohz(int ms);
int
hztoms(int hz);
DESCRIPTION
The mstohz() macro can be used to convert time in milliseconds to system clock ticks, as used by the callout(9) facility, in an integer-over-
flow safe way. Conversely, hztoms() converts system clock ticks to milliseconds.
These macros are defined in the <sys/param.h> header. Individual ports can have a processor-specific, more efficient version implemented in
their <machine/param.h> header as a define.
RETURN VALUES
The return value is either the number of clock ticks or milliseconds for the specified value.
SEE ALSO param(3), callout(9), tvtohz(9)BUGS
Neither mstohz() nor hztoms() make use of expensive 64-bit integer arithmetic. The result from mstohz() will be rounded down to one second
if the parameter is larger than 131072 milliseconds.
BSD October 20, 2011 BSD
Check Out this Related Man Page
drv_usectohz(9F) Kernel Functions for Drivers 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 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
drv_usectohz() can be called from user or interrupt context.
SEE ALSO delay(9F), drv_hztousec(9F), timeout(9F)
Writing Device Drivers
SunOS 5.10 12 Nov 1992 drv_usectohz(9F)
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