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mstohz(9) [netbsd man page]

MSTOHZ(9)						   BSD Kernel Developer's Manual						 MSTOHZ(9)

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)

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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