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MSTOHZ(9) 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-overflow 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. NetBSD 8.0 October 20, 2011 NetBSD 8.0