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Commit4ef53f4

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gh-88494: Use GetSystemTimePreciseAsFileTime() in time.time()
1 parentb54d7c8 commit4ef53f4

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3 files changed

+25
-15
lines changed

3 files changed

+25
-15
lines changed

‎Doc/whatsnew/3.13.rst

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Original file line numberDiff line numberDiff line change
@@ -560,6 +560,12 @@ time
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instead of the ``GetTickCount64()`` clock which has a resolution of 15.6 ms.
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(Contributed by Victor Stinner in:gh:`88494`.)
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* On Windows,:func:`time.time()` now uses the
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``GetSystemTimePreciseAsFileTime()`` clock to have a resolution better
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than 1 us, instead of the ``GetSystemTimeAsFileTime()`` clock which has a
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resolution of 15.6 ms.
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(Contributed by Victor Stinner in:gh:`88494`.)
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tkinter
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-------
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,4 @@
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On Windows,:func:`time.time()` now uses the
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``GetSystemTimePreciseAsFileTime()`` clock to have a resolution better than 1
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us, instead of the ``GetSystemTimeAsFileTime()`` clock which has a resolution
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of 15.6 ms. Patch by Victor Stinner.

‎Python/pytime.c

Lines changed: 15 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -895,7 +895,7 @@ py_get_system_clock(PyTime_t *tp, _Py_clock_info_t *info, int raise_exc)
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FILETIMEsystem_time;
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ULARGE_INTEGERlarge;
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898-
GetSystemTimeAsFileTime(&system_time);
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GetSystemTimePreciseAsFileTime(&system_time);
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large.u.LowPart=system_time.dwLowDateTime;
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large.u.HighPart=system_time.dwHighDateTime;
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/* 11,644,473,600,000,000,000: number of nanoseconds between
@@ -904,18 +904,17 @@ py_get_system_clock(PyTime_t *tp, _Py_clock_info_t *info, int raise_exc)
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PyTime_tns=large.QuadPart*100-11644473600000000000;
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*tp=ns;
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if (info) {
907-
DWORDtimeAdjustment,timeIncrement;
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BOOLisTimeAdjustmentDisabled,ok;
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// GetSystemTimePreciseAsFileTime() is implemented using
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// QueryPerformanceCounter() internally.
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if (py_qpc_base.denom==0) {
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if (py_win_perf_counter_frequency(&py_qpc_base,raise_exc)<0) {
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return-1;
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}
913+
}
909914

910-
info->implementation="GetSystemTimeAsFileTime()";
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info->implementation="GetSystemTimePreciseAsFileTime()";
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info->monotonic=0;
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ok=GetSystemTimeAdjustment(&timeAdjustment,&timeIncrement,
913-
&isTimeAdjustmentDisabled);
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if (!ok) {
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PyErr_SetFromWindowsErr(0);
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return-1;
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}
918-
info->resolution=timeIncrement*1e-7;
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info->resolution=_PyTimeFraction_Resolution(&py_qpc_base);
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info->adjustable=1;
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}
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@@ -1057,22 +1056,23 @@ py_win_perf_counter_frequency(_PyTimeFraction *base, int raise_exc)
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}
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static_PyTimeFractionpy_qpc_base= {0,0};
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// N.B. If raise_exc=0, this may be called without the GIL.
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staticint
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py_get_win_perf_counter(PyTime_t*tp,_Py_clock_info_t*info,intraise_exc)
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{
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assert(info==NULL||raise_exc);
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1066-
static_PyTimeFractionbase= {0,0};
1067-
if (base.denom==0) {
1068-
if (py_win_perf_counter_frequency(&base,raise_exc)<0) {
1067+
if (py_qpc_base.denom==0) {
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if (py_win_perf_counter_frequency(&py_qpc_base,raise_exc)<0) {
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return-1;
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}
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}
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if (info) {
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info->implementation="QueryPerformanceCounter()";
1075-
info->resolution=_PyTimeFraction_Resolution(&base);
1075+
info->resolution=_PyTimeFraction_Resolution(&py_qpc_base);
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info->monotonic=1;
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info->adjustable=0;
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}

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