void
thread_read_times(
thread_t thread,
time_value_t *user_time,
time_value_t *system_time)
{
clock_sec_t secs;
clock_usec_t usecs;
uint64_t tval_user, tval_system;
tval_user = timer_grab(&thread->user_timer);
tval_system = timer_grab(&thread->system_timer);
if (thread->precise_user_kernel_time) {
absolutetime_to_microtime(tval_user, &secs, &usecs);
user_time->seconds = (typeof(user_time->seconds))secs;
user_time->microseconds = usecs;
absolutetime_to_microtime(tval_system, &secs, &usecs);
system_time->seconds = (typeof(system_time->seconds))secs;
system_time->microseconds = usecs;
} else {
/* system_timer may represent either sys or user */
tval_user += tval_system;
absolutetime_to_microtime(tval_user, &secs, &usecs);
user_time->seconds = (typeof(user_time->seconds))secs;
user_time->microseconds = usecs;
system_time->seconds = 0;
system_time->microseconds = 0;
}
}
void
thread_read_times(
thread_t thread,
time_value_t *user_time,
time_value_t *system_time)
{
absolutetime_to_microtime(timer_grab(&thread->user_timer),
(unsigned *)&user_time->seconds,
(unsigned *)&user_time->microseconds);
absolutetime_to_microtime(timer_grab(&thread->system_timer),
(unsigned *)&system_time->seconds,
(unsigned *)&system_time->microseconds);
}
void
thread_read_times(
thread_t thread,
time_value_t *user_time,
time_value_t *system_time)
{
clock_sec_t secs;
clock_usec_t usecs;
absolutetime_to_microtime(timer_grab(&thread->user_timer), &secs, &usecs);
user_time->seconds = (typeof(user_time->seconds))secs;
user_time->microseconds = usecs;
absolutetime_to_microtime(timer_grab(&thread->system_timer), &secs, &usecs);
system_time->seconds = (typeof(system_time->seconds))secs;
system_time->microseconds = usecs;
}
/*
* clock_get_calendar_nanotime_nowait
*
* Description: Non-blocking version of clock_get_calendar_nanotime()
*
* Notes: This function operates by separately tracking calendar time
* updates using a two element structure to copy the calendar
* state, which may be asynchronously modified. It utilizes
* barrier instructions in the tracking process and in the local
* stable snapshot process in order to ensure that a consistent
* snapshot is used to perform the calculation.
*/
void
clock_get_calendar_nanotime_nowait(
clock_sec_t *secs,
clock_nsec_t *nanosecs)
{
int i = 0;
uint64_t now;
struct unlocked_clock_calend stable;
for (;;) {
stable = flipflop[i]; /* take snapshot */
/*
* Use a barrier instructions to ensure atomicity. We AND
* off the "in progress" bit to get the current generation
* count.
*/
(void)hw_atomic_and(&stable.gen, ~(uint32_t)1);
/*
* If an update _is_ in progress, the generation count will be
* off by one, if it _was_ in progress, it will be off by two,
* and if we caught it at a good time, it will be equal (and
* our snapshot is threfore stable).
*/
if (flipflop[i].gen == stable.gen)
break;
/* Switch to the oher element of the flipflop, and try again. */
i ^= 1;
}
now = mach_absolute_time();
if (stable.calend.adjdelta < 0) {
uint32_t t32;
if (now > stable.calend.adjstart) {
t32 = (uint32_t)(now - stable.calend.adjstart);
if (t32 > stable.calend.adjoffset)
now -= stable.calend.adjoffset;
else
now = stable.calend.adjstart;
}
}
now += stable.calend.offset;
absolutetime_to_microtime(now, secs, nanosecs);
*nanosecs *= NSEC_PER_USEC;
*secs += (clock_sec_t)stable.calend.epoch;
}
/*
* clock_get_calendar_microtime:
*
* Returns the current calendar value,
* microseconds as the fraction.
*/
void
clock_get_calendar_microtime(
clock_sec_t *secs,
clock_usec_t *microsecs)
{
uint64_t now;
spl_t s;
s = splclock();
clock_lock();
now = mach_absolute_time();
if (clock_calend.adjdelta < 0) {
uint32_t t32;
/*
* Since offset is decremented during a negative adjustment,
* ensure that time increases monotonically without going
* temporarily backwards.
* If the delta has not yet passed, now is set to the start
* of the current adjustment period; otherwise, we're between
* the expiry of the delta and the next call to calend_adjust(),
* and we offset accordingly.
*/
if (now > clock_calend.adjstart) {
t32 = (uint32_t)(now - clock_calend.adjstart);
if (t32 > clock_calend.adjoffset)
now -= clock_calend.adjoffset;
else
now = clock_calend.adjstart;
}
}
now += clock_calend.offset;
absolutetime_to_microtime(now, secs, microsecs);
*secs += (clock_sec_t)clock_calend.epoch;
clock_unlock();
splx(s);
}
/*
* clock_gettimeofday:
*
* Kernel interface for commpage implementation of
* gettimeofday() syscall.
*
* Returns the current calendar value, and updates the
* commpage info as appropriate. Because most calls to
* gettimeofday() are handled in user mode by the commpage,
* this routine should be used infrequently.
*/
void
clock_gettimeofday(
clock_sec_t *secs,
clock_usec_t *microsecs)
{
uint64_t now;
spl_t s;
s = splclock();
clock_lock();
now = mach_absolute_time();
if (clock_calend.adjdelta >= 0) {
clock_gettimeofday_set_commpage(now, clock_calend.epoch, clock_calend.offset, secs, microsecs);
}
else {
uint32_t t32;
if (now > clock_calend.adjstart) {
t32 = (uint32_t)(now - clock_calend.adjstart);
if (t32 > clock_calend.adjoffset)
now -= clock_calend.adjoffset;
else
now = clock_calend.adjstart;
}
now += clock_calend.offset;
absolutetime_to_microtime(now, secs, microsecs);
*secs += (clock_sec_t)clock_calend.epoch;
}
clock_unlock();
splx(s);
}
/*
* clock_get_calendar_nanotime:
*
* Returns the current calendar value,
* nanoseconds as the fraction.
*
* Since we do not have an interface to
* set the calendar with resolution greater
* than a microsecond, we honor that here.
*/
void
clock_get_calendar_nanotime(
clock_sec_t *secs,
clock_nsec_t *nanosecs)
{
uint64_t now;
spl_t s;
s = splclock();
clock_lock();
now = mach_absolute_time();
if (clock_calend.adjdelta < 0) {
uint32_t t32;
if (now > clock_calend.adjstart) {
t32 = (uint32_t)(now - clock_calend.adjstart);
if (t32 > clock_calend.adjoffset)
now -= clock_calend.adjoffset;
else
now = clock_calend.adjstart;
}
}
now += clock_calend.offset;
absolutetime_to_microtime(now, secs, nanosecs);
*nanosecs *= NSEC_PER_USEC;
*secs += (clock_sec_t)clock_calend.epoch;
clock_unlock();
splx(s);
}
