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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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6
Include/pytime.h
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@ -197,7 +197,7 @@ PyAPI_FUNC(int) _PyTime_gmtime(time_t t, struct tm *tm);
The function cannot fail. _PyTime_Init() ensures that the system clock
works. */
PyAPI_FUNC(double) _PyTime_GetPerfCounterDouble(void);
PyAPI_FUNC(_PyTime_t) _PyTime_GetPerfCounter(void);
/* Get the performance counter: clock with the highest available resolution to
measure a short duration.
@ -205,8 +205,8 @@ PyAPI_FUNC(double) _PyTime_GetPerfCounterDouble(void);
Fill info (if set) with information of the function used to get the time.
Return 0 on success, raise an exception and return -1 on error. */
PyAPI_FUNC(int) _PyTime_GetPerfCounterDoubleWithInfo(
double *t,
PyAPI_FUNC(int) _PyTime_GetPerfCounterWithInfo(
_PyTime_t *t,
_Py_clock_info_t *info);
#ifdef __cplusplus