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bpo-31773: time.perf_counter() uses again double (GH-3964)

Browse source 
time.clock() and time.perf_counter() now use again C double
internally.

Remove also _PyTime_GetWinPerfCounterWithInfo(): use
_PyTime_GetPerfCounterDoubleWithInfo() instead on Windows.
This commit is contained in:
Victor Stinner 2017-10-12 08:51:56 -07:00 • committed by GitHub
parent 0e61e67a57
commit cba9a0c6de
4 changed files with 50 additions and 49 deletions
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36
Python/pytime.c
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@ -801,8 +801,8 @@ _PyTime_GetMonotonicClockWithInfo(_PyTime_t *tp, _Py_clock_info_t *info)
#ifdef MS_WINDOWS
int
_PyTime_GetWinPerfCounterWithInfo(_PyTime_t *t, _Py_clock_info_t *info)
static int
win_perf_counter(double *tp, _Py_clock_info_t *info)
{
static LONGLONG cpu_frequency = 0;
static LONGLONG ctrStart;
@ -829,28 +829,33 @@ _PyTime_GetWinPerfCounterWithInfo(_PyTime_t *t, _Py_clock_info_t *info)
}
diff = diff / (double)cpu_frequency;
return _PyTime_FromDouble(t, diff, _PyTime_ROUND_FLOOR, SEC_TO_NS);
*tp = diff;
return 0;
}
#endif
int
_PyTime_GetPerfCounterWithInfo(_PyTime_t *t, _Py_clock_info_t *info)
_PyTime_GetPerfCounterDoubleWithInfo(double *d, _Py_clock_info_t *info)
{
#ifdef MS_WINDOWS
return _PyTime_GetWinPerfCounterWithInfo(t, info);
return win_perf_counter(d, info);
#else
return _PyTime_GetMonotonicClockWithInfo(t, info);
_PyTime_t t;
if (_PyTime_GetMonotonicClockWithInfo(&t, info) < 0) {
return -1;
}
*d = _PyTime_AsSecondsDouble(t);
return 0;
#endif
}
_PyTime_t
_PyTime_GetPerfCounter(void)
double
_PyTime_GetPerfCounterDouble(void)
{
_PyTime_t t;
if (_PyTime_GetPerfCounterWithInfo(&t, NULL) < 0) {
/* should not happen, _PyTime_Init() checked the clock at startup */
double t;
if (_PyTime_GetPerfCounterDoubleWithInfo(&t, NULL)) {
Py_UNREACHABLE();
}
return t;
@ -860,17 +865,18 @@ _PyTime_GetPerfCounter(void)
int
_PyTime_Init(void)
{
/* check that the 3 most important clocks are working properly
to not have to check for exceptions at runtime. If a clock works once,
it cannot fail in next calls. */
/* check that time.time(), time.monotonic() and time.perf_counter() clocks
are working properly to not have to check for exceptions at runtime. If
a clock works once, it cannot fail in next calls. */
_PyTime_t t;
double d;
if (_PyTime_GetSystemClockWithInfo(&t, NULL) < 0) {
return -1;
}
if (_PyTime_GetMonotonicClockWithInfo(&t, NULL) < 0) {
return -1;
}
if (_PyTime_GetPerfCounterWithInfo(&t, NULL) < 0) {
if (_PyTime_GetPerfCounterDoubleWithInfo(&d, NULL) < 0) {
return -1;
}
return 0;