cpython/Python/pytime.c at 3.11 · python/cpython · GitHub

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#include "Python.h"

#ifdef MS_WINDOWS

# include <winsock2.h> // struct timeval

#endif

#if defined(__APPLE__)

# include <mach/mach_time.h> // mach_absolute_time(), mach_timebase_info()

#if defined(__APPLE__) && defined(__has_builtin)

# if __has_builtin(__builtin_available)

# define HAVE_CLOCK_GETTIME_RUNTIME __builtin_available(macOS 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *)

# endif

#endif

/* To millisecond (10^-3) */

#define SEC_TO_MS 1000

/* To microseconds (10^-6) */

#define MS_TO_US 1000

#define SEC_TO_US (SEC_TO_MS * MS_TO_US)

/* To nanoseconds (10^-9) */

#define US_TO_NS 1000

#define MS_TO_NS (MS_TO_US * US_TO_NS)

#define SEC_TO_NS (SEC_TO_MS * MS_TO_NS)

/* Conversion from nanoseconds */

#define NS_TO_MS (1000 * 1000)

#define NS_TO_US (1000)

#define NS_TO_100NS (100)

#if SIZEOF_TIME_T == SIZEOF_LONG_LONG

# define PY_TIME_T_MAX LLONG_MAX

# define PY_TIME_T_MIN LLONG_MIN

#elif SIZEOF_TIME_T == SIZEOF_LONG

# define PY_TIME_T_MAX LONG_MAX

# define PY_TIME_T_MIN LONG_MIN

#else

# error "unsupported time_t size"

#endif

#if PY_TIME_T_MAX + PY_TIME_T_MIN != -1

# error "time_t is not a two's complement integer type"

#endif

#if _PyTime_MIN + _PyTime_MAX != -1

# error "_PyTime_t is not a two's complement integer type"

#endif

static void

pytime_time_t_overflow(void)

{

PyErr_SetString(PyExc_OverflowError,

"timestamp out of range for platform time_t");

}

static void

pytime_overflow(void)

{

PyErr_SetString(PyExc_OverflowError,

"timestamp too large to convert to C _PyTime_t");

}

static inline _PyTime_t

pytime_from_nanoseconds(_PyTime_t t)

{

// _PyTime_t is a number of nanoseconds

return t;

}

static inline _PyTime_t

pytime_as_nanoseconds(_PyTime_t t)

{

// _PyTime_t is a number of nanoseconds: see pytime_from_nanoseconds()

return t;

}

// Compute t1 + t2. Clamp to [_PyTime_MIN; _PyTime_MAX] on overflow.

static inline int

pytime_add(_PyTime_t *t1, _PyTime_t t2)

{

if (t2 > 0 && *t1 > _PyTime_MAX - t2) {

*t1 = _PyTime_MAX;

return -1;

}

else if (t2 < 0 && *t1 < _PyTime_MIN - t2) {

*t1 = _PyTime_MIN;

return -1;

}

else {

*t1 += t2;

return 0;

}

_PyTime_t

_PyTime_Add(_PyTime_t t1, _PyTime_t t2)

{

(void)pytime_add(&t1, t2);

return t1;

}

static inline int

pytime_mul_check_overflow(_PyTime_t a, _PyTime_t b)

{

if (b != 0) {

assert(b > 0);

return ((a < _PyTime_MIN / b) || (_PyTime_MAX / b < a));

}

else {

return 0;

}

// Compute t * k. Clamp to [_PyTime_MIN; _PyTime_MAX] on overflow.

static inline int

pytime_mul(_PyTime_t *t, _PyTime_t k)

{

assert(k >= 0);

if (pytime_mul_check_overflow(*t, k)) {

*t = (*t >= 0) ? _PyTime_MAX : _PyTime_MIN;

return -1;

}

else {

*t *= k;

return 0;

}

// Compute t * k. Clamp to [_PyTime_MIN; _PyTime_MAX] on overflow.

static inline _PyTime_t

_PyTime_Mul(_PyTime_t t, _PyTime_t k)

{

(void)pytime_mul(&t, k);

return t;

}

_PyTime_t

_PyTime_MulDiv(_PyTime_t ticks, _PyTime_t mul, _PyTime_t div)

{

/* Compute (ticks * mul / div) in two parts to reduce the risk of integer

overflow: compute the integer part, and then the remaining part.

(ticks * mul) / div == (ticks / div) * mul + (ticks % div) * mul / div

_PyTime_t intpart, remaining;

intpart = ticks / div;

ticks %= div;

remaining = _PyTime_Mul(ticks, mul) / div;

// intpart * mul + remaining

return _PyTime_Add(_PyTime_Mul(intpart, mul), remaining);

}

time_t

_PyLong_AsTime_t(PyObject *obj)

{

#if SIZEOF_TIME_T == SIZEOF_LONG_LONG

long long val = PyLong_AsLongLong(obj);

#elif SIZEOF_TIME_T <= SIZEOF_LONG

long val = PyLong_AsLong(obj);

#else

# error "unsupported time_t size"

#endif

if (val == -1 && PyErr_Occurred()) {

if (PyErr_ExceptionMatches(PyExc_OverflowError)) {

pytime_time_t_overflow();

}

return -1;

}

return (time_t)val;

}

PyObject *

_PyLong_FromTime_t(time_t t)

{

#if SIZEOF_TIME_T == SIZEOF_LONG_LONG

return PyLong_FromLongLong((long long)t);

#elif SIZEOF_TIME_T <= SIZEOF_LONG

return PyLong_FromLong((long)t);

#else

# error "unsupported time_t size"

#endif

}

// Convert _PyTime_t to time_t.

// Return 0 on success. Return -1 and clamp the value on overflow.

static int

_PyTime_AsTime_t(_PyTime_t t, time_t *t2)

{

#if SIZEOF_TIME_T < _SIZEOF_PYTIME_T

if ((_PyTime_t)PY_TIME_T_MAX < t) {

*t2 = PY_TIME_T_MAX;

return -1;

}

if (t < (_PyTime_t)PY_TIME_T_MIN) {

*t2 = PY_TIME_T_MIN;

return -1;

}

#endif

*t2 = (time_t)t;

return 0;

}

#ifdef MS_WINDOWS

// Convert _PyTime_t to long.

// Return 0 on success. Return -1 and clamp the value on overflow.

static int

_PyTime_AsLong(_PyTime_t t, long *t2)

{

#if SIZEOF_LONG < _SIZEOF_PYTIME_T

if ((_PyTime_t)LONG_MAX < t) {

*t2 = LONG_MAX;

return -1;

}

if (t < (_PyTime_t)LONG_MIN) {

*t2 = LONG_MIN;

return -1;

}

#endif

*t2 = (long)t;

return 0;

}

#endif

/* Round to nearest with ties going to nearest even integer

(_PyTime_ROUND_HALF_EVEN) */

static double

pytime_round_half_even(double x)

{

double rounded = round(x);

if (fabs(x-rounded) == 0.5) {

/* halfway case: round to even */

rounded = 2.0 * round(x / 2.0);

}

return rounded;

}

static double

pytime_round(double x, _PyTime_round_t round)

{

/* volatile avoids optimization changing how numbers are rounded */

volatile double d;

d = x;

if (round == _PyTime_ROUND_HALF_EVEN) {

d = pytime_round_half_even(d);

}

else if (round == _PyTime_ROUND_CEILING) {

d = ceil(d);

}

else if (round == _PyTime_ROUND_FLOOR) {

d = floor(d);

}

else {

assert(round == _PyTime_ROUND_UP);

d = (d >= 0.0) ? ceil(d) : floor(d);

}

return d;

}

static int

pytime_double_to_denominator(double d, time_t *sec, long *numerator,

long idenominator, _PyTime_round_t round)

{

double denominator = (double)idenominator;

double intpart;

/* volatile avoids optimization changing how numbers are rounded */

volatile double floatpart;

floatpart = modf(d, &intpart);

floatpart *= denominator;

floatpart = pytime_round(floatpart, round);

if (floatpart >= denominator) {

floatpart -= denominator;

intpart += 1.0;

}

else if (floatpart < 0) {

floatpart += denominator;

intpart -= 1.0;

}

assert(0.0 <= floatpart && floatpart < denominator);

Conversion of an out-of-range value to time_t gives undefined behaviour

(C99 §6.3.1.4p1), so we must guard against it. However, checking that

`intpart` is in range is delicate: the obvious expression `intpart <=

PY_TIME_T_MAX` will first convert the value `PY_TIME_T_MAX` to a double,

potentially changing its value and leading to us failing to catch some

UB-inducing values. The code below works correctly under the mild

assumption that time_t is a two's complement integer type with no trap

representation, and that `PY_TIME_T_MIN` is within the representable

range of a C double.

Note: we want the `if` condition below to be true for NaNs; therefore,

resist any temptation to simplify by applying De Morgan's laws.

if (!((double)PY_TIME_T_MIN <= intpart && intpart < -(double)PY_TIME_T_MIN)) {

pytime_time_t_overflow();

return -1;

}

*sec = (time_t)intpart;

*numerator = (long)floatpart;

assert(0 <= *numerator && *numerator < idenominator);

return 0;

}

static int

pytime_object_to_denominator(PyObject *obj, time_t *sec, long *numerator,

long denominator, _PyTime_round_t round)

{

assert(denominator >= 1);

if (PyFloat_Check(obj)) {

double d = PyFloat_AsDouble(obj);

if (Py_IS_NAN(d)) {

*numerator = 0;

PyErr_SetString(PyExc_ValueError, "Invalid value NaN (not a number)");

return -1;

}

return pytime_double_to_denominator(d, sec, numerator,

denominator, round);

}

else {

*sec = _PyLong_AsTime_t(obj);

*numerator = 0;

if (*sec == (time_t)-1 && PyErr_Occurred()) {

return -1;

}

return 0;

}

int

_PyTime_ObjectToTime_t(PyObject *obj, time_t *sec, _PyTime_round_t round)

{

if (PyFloat_Check(obj)) {

double intpart;

/* volatile avoids optimization changing how numbers are rounded */

volatile double d;

d = PyFloat_AsDouble(obj);

if (Py_IS_NAN(d)) {

PyErr_SetString(PyExc_ValueError, "Invalid value NaN (not a number)");

return -1;

}

d = pytime_round(d, round);

(void)modf(d, &intpart);

/* See comments in pytime_double_to_denominator */

if (!((double)PY_TIME_T_MIN <= intpart && intpart < -(double)PY_TIME_T_MIN)) {

pytime_time_t_overflow();

return -1;

}

*sec = (time_t)intpart;

return 0;

}

else {

*sec = _PyLong_AsTime_t(obj);

if (*sec == (time_t)-1 && PyErr_Occurred()) {

return -1;

}

return 0;

}

int

_PyTime_ObjectToTimespec(PyObject *obj, time_t *sec, long *nsec,

_PyTime_round_t round)

{

return pytime_object_to_denominator(obj, sec, nsec, SEC_TO_NS, round);

}

int

_PyTime_ObjectToTimeval(PyObject *obj, time_t *sec, long *usec,

_PyTime_round_t round)

{

return pytime_object_to_denominator(obj, sec, usec, SEC_TO_US, round);

}

_PyTime_t

_PyTime_FromSeconds(int seconds)

{

/* ensure that integer overflow cannot happen, int type should have 32

bits, whereas _PyTime_t type has at least 64 bits (SEC_TO_NS takes 30

bits). */

static_assert(INT_MAX <= _PyTime_MAX / SEC_TO_NS, "_PyTime_t overflow");

static_assert(INT_MIN >= _PyTime_MIN / SEC_TO_NS, "_PyTime_t underflow");

_PyTime_t t = (_PyTime_t)seconds;

assert((t >= 0 && t <= _PyTime_MAX / SEC_TO_NS)

|| (t < 0 && t >= _PyTime_MIN / SEC_TO_NS));

t *= SEC_TO_NS;

return pytime_from_nanoseconds(t);

}

_PyTime_t

_PyTime_FromNanoseconds(_PyTime_t ns)

{

return pytime_from_nanoseconds(ns);

}

int

_PyTime_FromNanosecondsObject(_PyTime_t *tp, PyObject *obj)

{

if (!PyLong_Check(obj)) {

PyErr_Format(PyExc_TypeError, "expect int, got %s",

Py_TYPE(obj)->tp_name);

return -1;

}

static_assert(sizeof(long long) == sizeof(_PyTime_t),

"_PyTime_t is not long long");

long long nsec = PyLong_AsLongLong(obj);

if (nsec == -1 && PyErr_Occurred()) {

if (PyErr_ExceptionMatches(PyExc_OverflowError)) {

pytime_overflow();

}

return -1;

}

_PyTime_t t = (_PyTime_t)nsec;

*tp = pytime_from_nanoseconds(t);

return 0;

}

#ifdef HAVE_CLOCK_GETTIME

static int

pytime_fromtimespec(_PyTime_t *tp, struct timespec *ts, int raise_exc)

{

_PyTime_t t, tv_nsec;

static_assert(sizeof(ts->tv_sec) <= sizeof(_PyTime_t),

"timespec.tv_sec is larger than _PyTime_t");

t = (_PyTime_t)ts->tv_sec;

int res1 = pytime_mul(&t, SEC_TO_NS);

tv_nsec = ts->tv_nsec;

int res2 = pytime_add(&t, tv_nsec);

*tp = pytime_from_nanoseconds(t);

if (raise_exc && (res1 < 0 || res2 < 0)) {

pytime_overflow();

return -1;

}

return 0;

}

int

_PyTime_FromTimespec(_PyTime_t *tp, struct timespec *ts)

{

return pytime_fromtimespec(tp, ts, 1);

}

#endif

#ifndef MS_WINDOWS

static int

pytime_fromtimeval(_PyTime_t *tp, struct timeval *tv, int raise_exc)

{

static_assert(sizeof(tv->tv_sec) <= sizeof(_PyTime_t),

"timeval.tv_sec is larger than _PyTime_t");

_PyTime_t t = (_PyTime_t)tv->tv_sec;

int res1 = pytime_mul(&t, SEC_TO_NS);

_PyTime_t usec = (_PyTime_t)tv->tv_usec * US_TO_NS;

int res2 = pytime_add(&t, usec);

*tp = pytime_from_nanoseconds(t);

if (raise_exc && (res1 < 0 || res2 < 0)) {

pytime_overflow();

return -1;

}

return 0;

}

int

_PyTime_FromTimeval(_PyTime_t *tp, struct timeval *tv)

{

return pytime_fromtimeval(tp, tv, 1);

}

#endif

static int

pytime_from_double(_PyTime_t *tp, double value, _PyTime_round_t round,

long unit_to_ns)

{

/* volatile avoids optimization changing how numbers are rounded */

volatile double d;

/* convert to a number of nanoseconds */

d = value;

d *= (double)unit_to_ns;

d = pytime_round(d, round);

/* See comments in pytime_double_to_denominator */

if (!((double)_PyTime_MIN <= d && d < -(double)_PyTime_MIN)) {

pytime_time_t_overflow();

return -1;

}

_PyTime_t ns = (_PyTime_t)d;

*tp = pytime_from_nanoseconds(ns);

return 0;

}

static int

pytime_from_object(_PyTime_t *tp, PyObject *obj, _PyTime_round_t round,

long unit_to_ns)

{

if (PyFloat_Check(obj)) {

double d;

d = PyFloat_AsDouble(obj);

if (Py_IS_NAN(d)) {

PyErr_SetString(PyExc_ValueError, "Invalid value NaN (not a number)");

return -1;

}

return pytime_from_double(tp, d, round, unit_to_ns);

}

else {

long long sec = PyLong_AsLongLong(obj);

if (sec == -1 && PyErr_Occurred()) {

if (PyErr_ExceptionMatches(PyExc_OverflowError)) {

pytime_overflow();

}

return -1;

}

static_assert(sizeof(long long) <= sizeof(_PyTime_t),

"_PyTime_t is smaller than long long");

_PyTime_t ns = (_PyTime_t)sec;

if (pytime_mul(&ns, unit_to_ns) < 0) {

pytime_overflow();

return -1;

}

*tp = pytime_from_nanoseconds(ns);

return 0;

}

int

_PyTime_FromSecondsObject(_PyTime_t *tp, PyObject *obj, _PyTime_round_t round)

{

return pytime_from_object(tp, obj, round, SEC_TO_NS);

}

int

_PyTime_FromMillisecondsObject(_PyTime_t *tp, PyObject *obj, _PyTime_round_t round)

{

return pytime_from_object(tp, obj, round, MS_TO_NS);

}

double

_PyTime_AsSecondsDouble(_PyTime_t t)

{

/* volatile avoids optimization changing how numbers are rounded */

volatile double d;

_PyTime_t ns = pytime_as_nanoseconds(t);

if (ns % SEC_TO_NS == 0) {

/* Divide using integers to avoid rounding issues on the integer part.

1e-9 cannot be stored exactly in IEEE 64-bit. */

_PyTime_t secs = ns / SEC_TO_NS;

d = (double)secs;

}

else {

d = (double)ns;

d /= 1e9;

}

return d;

}

PyObject *

_PyTime_AsNanosecondsObject(_PyTime_t t)

{

_PyTime_t ns = pytime_as_nanoseconds(t);

static_assert(sizeof(long long) >= sizeof(_PyTime_t),

"_PyTime_t is larger than long long");

return PyLong_FromLongLong((long long)ns);

}

static _PyTime_t

pytime_divide_round_up(const _PyTime_t t, const _PyTime_t k)

{

assert(k > 1);

if (t >= 0) {

// Don't use (t + k - 1) / k to avoid integer overflow

// if t is equal to _PyTime_MAX

_PyTime_t q = t / k;

if (t % k) {

q += 1;

}

return q;

}

else {

// Don't use (t - (k - 1)) / k to avoid integer overflow

// if t is equals to _PyTime_MIN.

_PyTime_t q = t / k;

if (t % k) {

q -= 1;

}

return q;

}

static _PyTime_t

pytime_divide(const _PyTime_t t, const _PyTime_t k,

const _PyTime_round_t round)

{

assert(k > 1);

if (round == _PyTime_ROUND_HALF_EVEN) {

_PyTime_t x = t / k;

_PyTime_t r = t % k;

_PyTime_t abs_r = Py_ABS(r);

if (abs_r > k / 2 || (abs_r == k / 2 && (Py_ABS(x) & 1))) {

if (t >= 0) {

x++;

}

else {

x--;

}

return x;

}

else if (round == _PyTime_ROUND_CEILING) {

if (t >= 0) {

return pytime_divide_round_up(t, k);

}

else {

return t / k;

}

else if (round == _PyTime_ROUND_FLOOR){

if (t >= 0) {

return t / k;

}

else {

return pytime_divide_round_up(t, k);

}

else {

assert(round == _PyTime_ROUND_UP);

return pytime_divide_round_up(t, k);

}

// Compute (t / k, t % k) in (pq, pr).

// Make sure that 0 <= pr < k.

// Return 0 on success.

// Return -1 on underflow and store (_PyTime_MIN, 0) in (pq, pr).

static int

pytime_divmod(const _PyTime_t t, const _PyTime_t k,

_PyTime_t *pq, _PyTime_t *pr)

{

assert(k > 1);

_PyTime_t q = t / k;

_PyTime_t r = t % k;

if (r < 0) {

if (q == _PyTime_MIN) {

*pq = _PyTime_MIN;

*pr = 0;

return -1;

}

r += k;

q -= 1;

}

assert(0 <= r && r < k);

*pq = q;

*pr = r;

return 0;

}

_PyTime_t

_PyTime_AsNanoseconds(_PyTime_t t)

{

return pytime_as_nanoseconds(t);

}

#ifdef MS_WINDOWS

_PyTime_t

_PyTime_As100Nanoseconds(_PyTime_t t, _PyTime_round_t round)

{

_PyTime_t ns = pytime_as_nanoseconds(t);

return pytime_divide(ns, NS_TO_100NS, round);

}

#endif

_PyTime_t

_PyTime_AsMicroseconds(_PyTime_t t, _PyTime_round_t round)

{

_PyTime_t ns = pytime_as_nanoseconds(t);

return pytime_divide(ns, NS_TO_US, round);

}

_PyTime_t

_PyTime_AsMilliseconds(_PyTime_t t, _PyTime_round_t round)

{

_PyTime_t ns = pytime_as_nanoseconds(t);

return pytime_divide(ns, NS_TO_MS, round);

}

static int

pytime_as_timeval(_PyTime_t t, _PyTime_t *ptv_sec, int *ptv_usec,

_PyTime_round_t round)

{

_PyTime_t ns = pytime_as_nanoseconds(t);

_PyTime_t us = pytime_divide(ns, US_TO_NS, round);

_PyTime_t tv_sec, tv_usec;

int res = pytime_divmod(us, SEC_TO_US, &tv_sec, &tv_usec);

*ptv_sec = tv_sec;

*ptv_usec = (int)tv_usec;

return res;

}

static int

pytime_as_timeval_struct(_PyTime_t t, struct timeval *tv,

_PyTime_round_t round, int raise_exc)

{

_PyTime_t tv_sec;

int tv_usec;

int res = pytime_as_timeval(t, &tv_sec, &tv_usec, round);

int res2;

#ifdef MS_WINDOWS

// On Windows, timeval.tv_sec type is long

res2 = _PyTime_AsLong(tv_sec, &tv->tv_sec);

#else

res2 = _PyTime_AsTime_t(tv_sec, &tv->tv_sec);

#endif

if (res2 < 0) {

tv_usec = 0;

}

tv->tv_usec = tv_usec;

if (raise_exc && (res < 0 || res2 < 0)) {

pytime_time_t_overflow();

return -1;

}

return 0;

}

int

_PyTime_AsTimeval(_PyTime_t t, struct timeval *tv, _PyTime_round_t round)

{

return pytime_as_timeval_struct(t, tv, round, 1);

}

void

_PyTime_AsTimeval_clamp(_PyTime_t t, struct timeval *tv, _PyTime_round_t round)

{

(void)pytime_as_timeval_struct(t, tv, round, 0);

}

int

_PyTime_AsTimevalTime_t(_PyTime_t t, time_t *p_secs, int *us,

_PyTime_round_t round)

{

_PyTime_t secs;

if (pytime_as_timeval(t, &secs, us, round) < 0) {

pytime_time_t_overflow();

return -1;

}

if (_PyTime_AsTime_t(secs, p_secs) < 0) {

pytime_time_t_overflow();

return -1;

}

return 0;

}

#if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_KQUEUE)

static int

pytime_as_timespec(_PyTime_t t, struct timespec *ts, int raise_exc)

{

_PyTime_t ns = pytime_as_nanoseconds(t);

_PyTime_t tv_sec, tv_nsec;

int res = pytime_divmod(ns, SEC_TO_NS, &tv_sec, &tv_nsec);

int res2 = _PyTime_AsTime_t(tv_sec, &ts->tv_sec);

if (res2 < 0) {

tv_nsec = 0;

}

ts->tv_nsec = tv_nsec;

if (raise_exc && (res < 0 || res2 < 0)) {

pytime_time_t_overflow();

return -1;

}

return 0;

}

void

_PyTime_AsTimespec_clamp(_PyTime_t t, struct timespec *ts)

{

(void)pytime_as_timespec(t, ts, 0);

}

int

_PyTime_AsTimespec(_PyTime_t t, struct timespec *ts)

{

return pytime_as_timespec(t, ts, 1);

}

#endif

static int

py_get_system_clock(_PyTime_t *tp, _Py_clock_info_t *info, int raise_exc)

{

assert(info == NULL || raise_exc);

#ifdef MS_WINDOWS

FILETIME system_time;

ULARGE_INTEGER large;

GetSystemTimeAsFileTime(&system_time);

large.u.LowPart = system_time.dwLowDateTime;

large.u.HighPart = system_time.dwHighDateTime;

/* 11,644,473,600,000,000,000: number of nanoseconds between

the 1st january 1601 and the 1st january 1970 (369 years + 89 leap

days). */

_PyTime_t ns = large.QuadPart * 100 - 11644473600000000000;

*tp = pytime_from_nanoseconds(ns);

if (info) {

DWORD timeAdjustment, timeIncrement;

BOOL isTimeAdjustmentDisabled, ok;

info->implementation = "GetSystemTimeAsFileTime()";

info->monotonic = 0;

ok = GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement,

&isTimeAdjustmentDisabled);

if (!ok) {

PyErr_SetFromWindowsErr(0);

return -1;

}

info->resolution = timeIncrement * 1e-7;

info->adjustable = 1;

}

#else /* MS_WINDOWS */

int err;

#if defined(HAVE_CLOCK_GETTIME)

struct timespec ts;

#endif

#if !defined(HAVE_CLOCK_GETTIME) || defined(__APPLE__)

struct timeval tv;

#endif

#ifdef HAVE_CLOCK_GETTIME

#ifdef HAVE_CLOCK_GETTIME_RUNTIME

if (HAVE_CLOCK_GETTIME_RUNTIME) {

#endif

err = clock_gettime(CLOCK_REALTIME, &ts);

if (err) {

if (raise_exc) {

PyErr_SetFromErrno(PyExc_OSError);

}

return -1;

}

if (pytime_fromtimespec(tp, &ts, raise_exc) < 0) {

return -1;

}

if (info) {

struct timespec res;

info->implementation = "clock_gettime(CLOCK_REALTIME)";

info->monotonic = 0;

info->adjustable = 1;

if (clock_getres(CLOCK_REALTIME, &res) == 0) {

info->resolution = (double)res.tv_sec + (double)res.tv_nsec * 1e-9;

}

else {

info->resolution = 1e-9;

}

#ifdef HAVE_CLOCK_GETTIME_RUNTIME

}

else {

#endif

#if !defined(HAVE_CLOCK_GETTIME) || defined(HAVE_CLOCK_GETTIME_RUNTIME)

/* test gettimeofday() */

err = gettimeofday(&tv, (struct timezone *)NULL);

if (err) {

if (raise_exc) {

PyErr_SetFromErrno(PyExc_OSError);

}

return -1;

}

if (pytime_fromtimeval(tp, &tv, raise_exc) < 0) {

return -1;

}

if (info) {

info->implementation = "gettimeofday()";

info->resolution = 1e-6;

info->monotonic = 0;

info->adjustable = 1;

}

#if defined(HAVE_CLOCK_GETTIME_RUNTIME) && defined(HAVE_CLOCK_GETTIME)

} /* end of availibity block */

#endif

#endif /* !HAVE_CLOCK_GETTIME */

#endif /* !MS_WINDOWS */

return 0;

}

_PyTime_t

_PyTime_GetSystemClock(void)

{

_PyTime_t t;

if (py_get_system_clock(&t, NULL, 0) < 0) {

// If clock_gettime(CLOCK_REALTIME) or gettimeofday() fails:

// silently ignore the failure and return 0.

t = 0;

}

return t;

}

int

_PyTime_GetSystemClockWithInfo(_PyTime_t *t, _Py_clock_info_t *info)

{

return py_get_system_clock(t, info, 1);

}

#ifdef __APPLE__

static int

py_mach_timebase_info(_PyTime_t *pnumer, _PyTime_t *pdenom, int raise)

{

static mach_timebase_info_data_t timebase;

/* According to the Technical Q&A QA1398, mach_timebase_info() cannot

fail: https://developer.apple.com/library/mac/#qa/qa1398/ */

(void)mach_timebase_info(&timebase);

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cpython/Python/pytime.c at 3.11 · python/cpython · GitHub

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