ilusha/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython synced 2026-09-29 12:10:30 +03:00
Code Issues Projects Releases Packages Wiki Activity Actions

bpo-37205: time.time() cannot fail with fatal error (GH-23314)

Browse source 
time.time(), time.perf_counter() and time.monotonic() functions can
no longer fail with a Python fatal error, instead raise a regular
Python exception on failure.

Remove _PyTime_Init(): don't check system, monotonic and perf counter
clocks at startup anymore.

On error, _PyTime_GetSystemClock(), _PyTime_GetMonotonicClock() and
_PyTime_GetPerfCounter() now silently ignore the error and return 0.
They cannot fail with a Python fatal error anymore.

Add py_mach_timebase_info() and win_perf_counter_frequency()
sub-functions.
This commit is contained in:
Victor Stinner 2020-11-16 16:08:05 +01:00 • committed by GitHub
parent 5909a494cd
commit ae6cd7cfda
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
5 changed files with 228 additions and 158 deletions
Download patch file Download diff file Expand all files Collapse all files

52
Include/pytime.h
View file

@ -164,22 +164,6 @@ PyAPI_FUNC(_PyTime_t) _PyTime_MulDiv(_PyTime_t ticks,
_PyTime_t mul,
_PyTime_t div);
/* Get the current time from the system clock.
The function cannot fail. _PyTime_Init() ensures that the system clock
works. */
PyAPI_FUNC(_PyTime_t) _PyTime_GetSystemClock(void);
/* Get the time of a monotonic clock, i.e. a clock that cannot go backwards.
The clock is not affected by system clock updates. The reference point of
the returned value is undefined, so that only the difference between the
results of consecutive calls is valid.
The function cannot fail. _PyTime_Init() ensures that a monotonic clock
is available and works. */
PyAPI_FUNC(_PyTime_t) _PyTime_GetMonotonicClock(void);
/* Structure used by time.get_clock_info() */
typedef struct {
const char *implementation;
@ -189,13 +173,34 @@ typedef struct {
} _Py_clock_info_t;
/* Get the current time from the system clock.
* Fill clock information if info is not NULL.
* Raise an exception and return -1 on error, return 0 on success.
If the internal clock fails, silently ignore the error and return 0.
On integer overflow, silently ignore the overflow and truncated the clock to
_PyTime_MIN or _PyTime_MAX.
Use _PyTime_GetSystemClockWithInfo() to check for failure. */
PyAPI_FUNC(_PyTime_t) _PyTime_GetSystemClock(void);
/* Get the current time from the system clock.
* On success, set *t and *info (if not NULL), and return 0.
* On error, raise an exception and return -1.
*/
PyAPI_FUNC(int) _PyTime_GetSystemClockWithInfo(
_PyTime_t *t,
_Py_clock_info_t *info);
/* Get the time of a monotonic clock, i.e. a clock that cannot go backwards.
The clock is not affected by system clock updates. The reference point of
the returned value is undefined, so that only the difference between the
results of consecutive calls is valid.
If the internal clock fails, silently ignore the error and return 0.
On integer overflow, silently ignore the overflow and truncated the clock to
_PyTime_MIN or _PyTime_MAX.
Use _PyTime_GetMonotonicClockWithInfo() to check for failure. */
PyAPI_FUNC(_PyTime_t) _PyTime_GetMonotonicClock(void);
/* Get the time of a monotonic clock, i.e. a clock that cannot go backwards.
The clock is not affected by system clock updates. The reference point of
the returned value is undefined, so that only the difference between the
@ -209,10 +214,6 @@ PyAPI_FUNC(int) _PyTime_GetMonotonicClockWithInfo(
_Py_clock_info_t *info);
/* Initialize time.
Return 0 on success, raise an exception and return -1 on error. */
PyAPI_FUNC(int) _PyTime_Init(void);
/* Converts a timestamp to the Gregorian time, using the local time zone.
Return 0 on success, raise an exception and return -1 on error. */
PyAPI_FUNC(int) _PyTime_localtime(time_t t, struct tm *tm);
@ -224,8 +225,11 @@ PyAPI_FUNC(int) _PyTime_gmtime(time_t t, struct tm *tm);
/* Get the performance counter: clock with the highest available resolution to
measure a short duration.
The function cannot fail. _PyTime_Init() ensures that the system clock
works. */
If the internal clock fails, silently ignore the error and return 0.
On integer overflow, silently ignore the overflow and truncated the clock to
_PyTime_MIN or _PyTime_MAX.
Use _PyTime_GetPerfCounterWithInfo() to check for failure. */
PyAPI_FUNC(_PyTime_t) _PyTime_GetPerfCounter(void);
/* Get the performance counter: clock with the highest available resolution to