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bpo-31773: _PyTime_GetPerfCounter() uses _PyTime_t (GH-3983)

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* Rewrite win_perf_counter() to only use integers internally.
* Add _PyTime_MulDiv() which compute "ticks * mul / div"
  in two parts (int part and remaining) to prevent integer overflow.
* Clock frequency is checked at initialization for integer overflow.
* Enhance also pymonotonic() to reduce the precision loss on macOS
  (mach_absolute_time() clock).
This commit is contained in:
Victor Stinner 2017-10-16 08:44:31 -07:00 • committed by GitHub
parent 0df19055c9
commit bdaeb7d237
4 changed files with 137 additions and 50 deletions
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7
Modules/timemodule.c
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@ -91,11 +91,12 @@ floatclock(_Py_clock_info_t *info)
static PyObject*
perf_counter(_Py_clock_info_t *info)
{
double t;
if (_PyTime_GetPerfCounterDoubleWithInfo(&t, info) < 0) {
_PyTime_t t;
if (_PyTime_GetPerfCounterWithInfo(&t, info) < 0) {
return NULL;
}
return PyFloat_FromDouble(t);
double d = _PyTime_AsSecondsDouble(t);
return PyFloat_FromDouble(d);
}
#if defined(MS_WINDOWS) || defined(HAVE_CLOCK)