Function sbttons

freebsd/sys/time.h:184–199

* Decimal<->sbt conversions. Multiplying or dividing by SBT_1NS results in * large roundoff errors which sbttons() and nstosbt() avoid. Millisecond and * microsecond functions are also provided for completeness. * * These functions return the smallest sbt larger or equal to the * number of seconds requested so that sbttoX(Xtosbt(y)) == y. Unlike * top of second computations below, which r

 * assert.h.
 */
static __inline int64_t
sbttons(sbintime_t _sbt)
{
	uint64_t ns;

#ifdef KASSERT
	KASSERT(_sbt >= 0, ("Negative values illegal for sbttons: %jx", _sbt));
#endif
	ns = _sbt;
	if (ns >= SBT_1S)
		ns = (ns >> 32) * 1000000000;
	else
		ns = 0;

	return (ns + (1000000000 * (_sbt & 0xffffffffu) >> 32));
}

static __inline sbintime_t
nstosbt(int64_t _ns)