Function ffclock_convert_diff

freebsd/kern/kern_tc.c:856–868

* Difference clock conversion. * Low level function to Convert a time interval measured in RAW counter units * into bintime. The difference clock allows measuring small intervals much more * reliably than the absolute clock. */

 * reliably than the absolute clock.
 */
void
ffclock_convert_diff(ffcounter ffdelta, struct bintime *bt)
{
	struct fftimehands *ffth;
	uint8_t gen;

	/* No locking but check generation has not changed. */
	do {
		ffth = fftimehands;
		gen = ffth->gen;
		ffclock_convert_delta(ffdelta, ffth->cest.period, bt);
	} while (gen == 0 || gen != ffth->gen);
}

/*
 * Access to current ffcounter value.