MSTOHZ(9) NetBSD Kernel Developer's Manual MSTOHZ(9)
mstohz, hztoms -- convert between milliseconds and system clock ticks
#include <sys/param.h> unsigned int mstohz(unsigned int ms); unsigned int hztoms(unsigned int hz);
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-overflow safe way. Conversely, hztoms() converts system clock ticks to millisec- onds. 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.
The return value is either the number of clock ticks or milliseconds for the specified value.
param(3), callout(9), tvtohz(9)
Neither mstohz() nor hztoms() make use of expensive 64-bit integer arith- metic. The result from mstohz() will be rounded down to one second if the parameter is larger than 131072 milliseconds. NetBSD 9.0 September 28, 2019 NetBSD 9.0
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