MSTOHZ(9) | Kernel Developer's Manual | MSTOHZ(9) |
mstohz
, hztoms
—
#include <sys/param.h>
int
mstohz
(int
ms);
int
hztoms
(int
hz);
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.
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.
October 20, 2011 | NetBSD 9.0 |