int NaClGetTimeOfDayIntern(struct nacl_abi_timeval *tv,
struct NaClTimeState *ntsp) {
FILETIME ft_now;
DWORD ms_counter_now;
uint64_t t_ms;
DWORD ms_counter_at_ft_now;
uint32_t ms_counter_diff;
uint64_t unix_time_ms;
if (ntsp->can_use_qpc)
return NaClGetTimeOfDayInternQpc(tv, ntsp, 1);
GetSystemTimeAsFileTime(&ft_now);
ms_counter_now = timeGetTime();
t_ms = NaClFileTimeToMs(&ft_now);
NaClXMutexLock(&ntsp->mu);
if (!ntsp->allow_low_resolution) {
NaClLog(5, "ms_counter_now %"NACL_PRIu32"\n",
(uint32_t) ms_counter_now);
NaClLog(5, "t_ms %"NACL_PRId64"\n", t_ms);
NaClLog(5, "system_time_start_ms %"NACL_PRIu64"\n",
ntsp->system_time_start_ms);
ms_counter_at_ft_now = (DWORD)
(ntsp->ms_counter_start +
(uint32_t) (t_ms - ntsp->system_time_start_ms));
NaClLog(5, "ms_counter_at_ft_now %"NACL_PRIu32"\n",
(uint32_t) ms_counter_at_ft_now);
ms_counter_diff = ms_counter_now - (uint32_t) ms_counter_at_ft_now;
NaClLog(5, "ms_counter_diff %"NACL_PRIu32"\n", ms_counter_diff);
if (ms_counter_diff <= kMaxMillsecondDriftBeforeRecalibration) {
t_ms = t_ms + ms_counter_diff;
} else {
NaClCalibrateWindowsClockMu(ntsp);
t_ms = ntsp->system_time_start_ms;
}
NaClLog(5, "adjusted t_ms = %"NACL_PRIu64"\n", t_ms);
}
unix_time_ms = t_ms - ntsp->epoch_start_ms;
NaClXMutexUnlock(&ntsp->mu);
NaClLog(5, "unix_time_ms = %"NACL_PRId64"\n", unix_time_ms);
/*
* Unix time is measured relative to a different epoch, Jan 1, 1970.
* See the module initialization for epoch_start_ms.
*/
tv->nacl_abi_tv_sec = (nacl_abi_time_t) (unix_time_ms / 1000);
tv->nacl_abi_tv_usec = (nacl_abi_suseconds_t) ((unix_time_ms % 1000) * 1000);
return 0;
}
void NaClTimeInternalInit(struct NaClTimeState *ntsp) {
TIMECAPS tc;
SYSTEMTIME st;
FILETIME ft;
/*
* Maximize timer/Sleep resolution.
*/
timeGetDevCaps(&tc, sizeof tc);
ntsp->wPeriodMin = tc.wPeriodMin;
ntsp->time_resolution_ns = tc.wPeriodMin * NACL_NANOS_PER_MILLI;
NaClLog(0, "NaClTimeInternalInit: timeBeginPeriod(%u)\n", tc.wPeriodMin);
timeBeginPeriod(ntsp->wPeriodMin);
/*
* Compute Unix epoch start; calibrate high resolution clock.
*/
st.wYear = 1970;
st.wMonth = 1;
st.wDay = 1;
st.wHour = 0;
st.wMinute = 0;
st.wSecond = 0;
st.wMilliseconds = 0;
SystemTimeToFileTime(&st, &ft);
ntsp->epoch_start_ms = NaClFileTimeToMs(&ft);
ntsp->last_reported_time_ms = 0;
NaClLog(0, "Unix epoch start is %"NACL_PRIu64"ms in Windows epoch time\n",
ntsp->epoch_start_ms);
NaClMutexCtor(&ntsp->mu);
/*
* We don't actually grab the lock, since the module initializer
* should be called before going threaded.
*/
NaClCalibrateWindowsClockMu(ntsp);
}
void NaClTimeInternalInit(struct NaClTimeState *ntsp) {
TIMECAPS tc;
SYSTEMTIME st;
FILETIME ft;
LARGE_INTEGER qpc_freq;
/*
* Maximize timer/Sleep resolution.
*/
timeGetDevCaps(&tc, sizeof tc);
if (ntsp->allow_low_resolution) {
/* Set resolution to max so we don't over-promise. */
ntsp->wPeriodMin = tc.wPeriodMax;
} else {
ntsp->wPeriodMin = tc.wPeriodMin;
timeBeginPeriod(ntsp->wPeriodMin);
NaClLog(4, "NaClTimeInternalInit: timeBeginPeriod(%u)\n", ntsp->wPeriodMin);
}
ntsp->time_resolution_ns = ntsp->wPeriodMin * NACL_NANOS_PER_MILLI;
/*
* Compute Unix epoch start; calibrate high resolution clock.
*/
st.wYear = 1970;
st.wMonth = 1;
st.wDay = 1;
st.wHour = 0;
st.wMinute = 0;
st.wSecond = 0;
st.wMilliseconds = 0;
SystemTimeToFileTime(&st, &ft);
ntsp->epoch_start_ms = NaClFileTimeToMs(&ft);
NaClLog(4, "Unix epoch start is %"NACL_PRIu64"ms in Windows epoch time\n",
ntsp->epoch_start_ms);
NaClMutexCtor(&ntsp->mu);
/*
* We don't actually grab the lock, since the module initializer
* should be called before going threaded.
*/
ntsp->can_use_qpc = 0;
if (!ntsp->allow_low_resolution) {
ntsp->can_use_qpc = QueryPerformanceFrequency(&qpc_freq);
/*
* On Athlon X2 CPUs (e.g. model 15) QueryPerformanceCounter is
* unreliable. Fallback to low-res clock.
*/
if (strstr(CPU_GetBrandString(), "AuthenticAMD") && (CPU_GetFamily() == 15))
ntsp->can_use_qpc = 0;
NaClLog(4,
"CPU_GetBrandString->[%s] ntsp->can_use_qpc=%d\n",
CPU_GetBrandString(),
ntsp->can_use_qpc);
if (ntsp->can_use_qpc) {
ntsp->qpc_frequency = qpc_freq.QuadPart;
NaClLog(4, "qpc_frequency = %"NACL_PRId64" (counts/s)\n",
ntsp->qpc_frequency);
if (!NaClCalibrateWindowsClockQpc(ntsp))
ntsp->can_use_qpc = 0;
}
if (!ntsp->can_use_qpc)
NaClCalibrateWindowsClockMu(ntsp);
}
}
