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1136 lines
27 KiB
1136 lines
27 KiB
#include "Python.h"
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#ifdef MS_WINDOWS
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#include <winsock2.h> /* struct timeval */
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#endif
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#if defined(__APPLE__)
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#include <mach/mach_time.h> /* mach_absolute_time(), mach_timebase_info() */
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#if defined(__APPLE__) && defined(__has_builtin)
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# if __has_builtin(__builtin_available)
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# define HAVE_CLOCK_GETTIME_RUNTIME __builtin_available(macOS 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *)
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# endif
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#endif
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#endif
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#define _PyTime_check_mul_overflow(a, b) \
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(assert(b > 0), \
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(_PyTime_t)(a) < _PyTime_MIN / (_PyTime_t)(b) \
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|| _PyTime_MAX / (_PyTime_t)(b) < (_PyTime_t)(a))
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/* To millisecond (10^-3) */
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#define SEC_TO_MS 1000
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/* To microseconds (10^-6) */
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#define MS_TO_US 1000
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#define SEC_TO_US (SEC_TO_MS * MS_TO_US)
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/* To nanoseconds (10^-9) */
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#define US_TO_NS 1000
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#define MS_TO_NS (MS_TO_US * US_TO_NS)
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#define SEC_TO_NS (SEC_TO_MS * MS_TO_NS)
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/* Conversion from nanoseconds */
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#define NS_TO_MS (1000 * 1000)
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#define NS_TO_US (1000)
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static void
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error_time_t_overflow(void)
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{
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PyErr_SetString(PyExc_OverflowError,
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"timestamp out of range for platform time_t");
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}
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static void
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_PyTime_overflow(void)
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{
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PyErr_SetString(PyExc_OverflowError,
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"timestamp too large to convert to C _PyTime_t");
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}
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_PyTime_t
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_PyTime_MulDiv(_PyTime_t ticks, _PyTime_t mul, _PyTime_t div)
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{
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_PyTime_t intpart, remaining;
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/* Compute (ticks * mul / div) in two parts to prevent integer overflow:
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compute integer part, and then the remaining part.
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(ticks * mul) / div == (ticks / div) * mul + (ticks % div) * mul / div
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The caller must ensure that "(div - 1) * mul" cannot overflow. */
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intpart = ticks / div;
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ticks %= div;
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remaining = ticks * mul;
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remaining /= div;
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return intpart * mul + remaining;
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}
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time_t
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_PyLong_AsTime_t(PyObject *obj)
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{
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#if SIZEOF_TIME_T == SIZEOF_LONG_LONG
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long long val;
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val = PyLong_AsLongLong(obj);
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#else
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long val;
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Py_BUILD_ASSERT(sizeof(time_t) <= sizeof(long));
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val = PyLong_AsLong(obj);
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#endif
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if (val == -1 && PyErr_Occurred()) {
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if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
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error_time_t_overflow();
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}
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return -1;
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}
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return (time_t)val;
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}
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PyObject *
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_PyLong_FromTime_t(time_t t)
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{
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#if SIZEOF_TIME_T == SIZEOF_LONG_LONG
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return PyLong_FromLongLong((long long)t);
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#else
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Py_BUILD_ASSERT(sizeof(time_t) <= sizeof(long));
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return PyLong_FromLong((long)t);
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#endif
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}
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/* Round to nearest with ties going to nearest even integer
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(_PyTime_ROUND_HALF_EVEN) */
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static double
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_PyTime_RoundHalfEven(double x)
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{
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double rounded = round(x);
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if (fabs(x-rounded) == 0.5) {
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/* halfway case: round to even */
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rounded = 2.0*round(x/2.0);
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}
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return rounded;
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}
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static double
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_PyTime_Round(double x, _PyTime_round_t round)
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{
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/* volatile avoids optimization changing how numbers are rounded */
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volatile double d;
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d = x;
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if (round == _PyTime_ROUND_HALF_EVEN) {
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d = _PyTime_RoundHalfEven(d);
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}
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else if (round == _PyTime_ROUND_CEILING) {
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d = ceil(d);
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}
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else if (round == _PyTime_ROUND_FLOOR) {
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d = floor(d);
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}
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else {
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assert(round == _PyTime_ROUND_UP);
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d = (d >= 0.0) ? ceil(d) : floor(d);
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}
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return d;
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}
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static int
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_PyTime_DoubleToDenominator(double d, time_t *sec, long *numerator,
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long idenominator, _PyTime_round_t round)
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{
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double denominator = (double)idenominator;
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double intpart;
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/* volatile avoids optimization changing how numbers are rounded */
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volatile double floatpart;
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floatpart = modf(d, &intpart);
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floatpart *= denominator;
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floatpart = _PyTime_Round(floatpart, round);
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if (floatpart >= denominator) {
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floatpart -= denominator;
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intpart += 1.0;
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}
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else if (floatpart < 0) {
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floatpart += denominator;
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intpart -= 1.0;
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}
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assert(0.0 <= floatpart && floatpart < denominator);
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if (!_Py_InIntegralTypeRange(time_t, intpart)) {
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error_time_t_overflow();
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return -1;
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}
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*sec = (time_t)intpart;
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*numerator = (long)floatpart;
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assert(0 <= *numerator && *numerator < idenominator);
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return 0;
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}
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static int
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_PyTime_ObjectToDenominator(PyObject *obj, time_t *sec, long *numerator,
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long denominator, _PyTime_round_t round)
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{
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assert(denominator >= 1);
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if (PyFloat_Check(obj)) {
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double d = PyFloat_AsDouble(obj);
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if (Py_IS_NAN(d)) {
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*numerator = 0;
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PyErr_SetString(PyExc_ValueError, "Invalid value NaN (not a number)");
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return -1;
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}
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return _PyTime_DoubleToDenominator(d, sec, numerator,
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denominator, round);
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}
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else {
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*sec = _PyLong_AsTime_t(obj);
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*numerator = 0;
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if (*sec == (time_t)-1 && PyErr_Occurred()) {
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return -1;
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}
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return 0;
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}
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}
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int
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_PyTime_ObjectToTime_t(PyObject *obj, time_t *sec, _PyTime_round_t round)
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{
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if (PyFloat_Check(obj)) {
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double intpart;
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/* volatile avoids optimization changing how numbers are rounded */
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volatile double d;
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d = PyFloat_AsDouble(obj);
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if (Py_IS_NAN(d)) {
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PyErr_SetString(PyExc_ValueError, "Invalid value NaN (not a number)");
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return -1;
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}
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d = _PyTime_Round(d, round);
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(void)modf(d, &intpart);
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if (!_Py_InIntegralTypeRange(time_t, intpart)) {
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error_time_t_overflow();
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return -1;
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}
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*sec = (time_t)intpart;
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return 0;
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}
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else {
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*sec = _PyLong_AsTime_t(obj);
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if (*sec == (time_t)-1 && PyErr_Occurred()) {
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return -1;
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}
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return 0;
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}
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}
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int
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_PyTime_ObjectToTimespec(PyObject *obj, time_t *sec, long *nsec,
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_PyTime_round_t round)
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{
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return _PyTime_ObjectToDenominator(obj, sec, nsec, SEC_TO_NS, round);
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}
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int
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_PyTime_ObjectToTimeval(PyObject *obj, time_t *sec, long *usec,
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_PyTime_round_t round)
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{
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return _PyTime_ObjectToDenominator(obj, sec, usec, SEC_TO_US, round);
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}
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_PyTime_t
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_PyTime_FromSeconds(int seconds)
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{
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_PyTime_t t;
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/* ensure that integer overflow cannot happen, int type should have 32
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bits, whereas _PyTime_t type has at least 64 bits (SEC_TO_MS takes 30
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bits). */
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Py_BUILD_ASSERT(INT_MAX <= _PyTime_MAX / SEC_TO_NS);
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Py_BUILD_ASSERT(INT_MIN >= _PyTime_MIN / SEC_TO_NS);
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t = (_PyTime_t)seconds;
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assert((t >= 0 && t <= _PyTime_MAX / SEC_TO_NS)
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|| (t < 0 && t >= _PyTime_MIN / SEC_TO_NS));
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t *= SEC_TO_NS;
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return t;
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}
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_PyTime_t
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_PyTime_FromNanoseconds(_PyTime_t ns)
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{
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/* _PyTime_t already uses nanosecond resolution, no conversion needed */
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return ns;
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}
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int
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_PyTime_FromNanosecondsObject(_PyTime_t *tp, PyObject *obj)
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{
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long long nsec;
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_PyTime_t t;
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if (!PyLong_Check(obj)) {
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PyErr_Format(PyExc_TypeError, "expect int, got %s",
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Py_TYPE(obj)->tp_name);
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return -1;
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}
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Py_BUILD_ASSERT(sizeof(long long) == sizeof(_PyTime_t));
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nsec = PyLong_AsLongLong(obj);
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if (nsec == -1 && PyErr_Occurred()) {
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if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
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_PyTime_overflow();
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}
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return -1;
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}
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/* _PyTime_t already uses nanosecond resolution, no conversion needed */
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t = (_PyTime_t)nsec;
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*tp = t;
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return 0;
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}
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#ifdef HAVE_CLOCK_GETTIME
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static int
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pytime_fromtimespec(_PyTime_t *tp, struct timespec *ts, int raise)
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{
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_PyTime_t t, nsec;
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int res = 0;
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Py_BUILD_ASSERT(sizeof(ts->tv_sec) <= sizeof(_PyTime_t));
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t = (_PyTime_t)ts->tv_sec;
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if (_PyTime_check_mul_overflow(t, SEC_TO_NS)) {
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if (raise) {
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_PyTime_overflow();
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}
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res = -1;
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t = (t > 0) ? _PyTime_MAX : _PyTime_MIN;
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}
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else {
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t = t * SEC_TO_NS;
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}
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nsec = ts->tv_nsec;
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/* The following test is written for positive only nsec */
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assert(nsec >= 0);
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if (t > _PyTime_MAX - nsec) {
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if (raise) {
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_PyTime_overflow();
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}
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res = -1;
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t = _PyTime_MAX;
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}
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else {
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t += nsec;
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}
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*tp = t;
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return res;
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}
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int
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_PyTime_FromTimespec(_PyTime_t *tp, struct timespec *ts)
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{
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return pytime_fromtimespec(tp, ts, 1);
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}
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#endif
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#if !defined(MS_WINDOWS)
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static int
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pytime_fromtimeval(_PyTime_t *tp, struct timeval *tv, int raise)
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{
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_PyTime_t t, usec;
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int res = 0;
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Py_BUILD_ASSERT(sizeof(tv->tv_sec) <= sizeof(_PyTime_t));
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t = (_PyTime_t)tv->tv_sec;
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if (_PyTime_check_mul_overflow(t, SEC_TO_NS)) {
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if (raise) {
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_PyTime_overflow();
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}
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res = -1;
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t = (t > 0) ? _PyTime_MAX : _PyTime_MIN;
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}
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else {
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t = t * SEC_TO_NS;
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}
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usec = (_PyTime_t)tv->tv_usec * US_TO_NS;
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/* The following test is written for positive only usec */
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assert(usec >= 0);
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if (t > _PyTime_MAX - usec) {
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if (raise) {
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_PyTime_overflow();
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}
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res = -1;
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t = _PyTime_MAX;
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}
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else {
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t += usec;
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}
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*tp = t;
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return res;
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}
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int
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_PyTime_FromTimeval(_PyTime_t *tp, struct timeval *tv)
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{
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return pytime_fromtimeval(tp, tv, 1);
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}
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#endif
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static int
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_PyTime_FromDouble(_PyTime_t *t, double value, _PyTime_round_t round,
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long unit_to_ns)
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{
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/* volatile avoids optimization changing how numbers are rounded */
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volatile double d;
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/* convert to a number of nanoseconds */
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d = value;
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d *= (double)unit_to_ns;
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d = _PyTime_Round(d, round);
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if (!_Py_InIntegralTypeRange(_PyTime_t, d)) {
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_PyTime_overflow();
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return -1;
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}
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*t = (_PyTime_t)d;
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return 0;
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}
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static int
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_PyTime_FromObject(_PyTime_t *t, PyObject *obj, _PyTime_round_t round,
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long unit_to_ns)
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{
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if (PyFloat_Check(obj)) {
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double d;
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d = PyFloat_AsDouble(obj);
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if (Py_IS_NAN(d)) {
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PyErr_SetString(PyExc_ValueError, "Invalid value NaN (not a number)");
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return -1;
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}
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return _PyTime_FromDouble(t, d, round, unit_to_ns);
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}
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else {
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long long sec;
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Py_BUILD_ASSERT(sizeof(long long) <= sizeof(_PyTime_t));
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sec = PyLong_AsLongLong(obj);
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if (sec == -1 && PyErr_Occurred()) {
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if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
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_PyTime_overflow();
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}
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return -1;
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}
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if (_PyTime_check_mul_overflow(sec, unit_to_ns)) {
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_PyTime_overflow();
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return -1;
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}
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*t = sec * unit_to_ns;
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return 0;
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}
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}
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int
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_PyTime_FromSecondsObject(_PyTime_t *t, PyObject *obj, _PyTime_round_t round)
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{
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return _PyTime_FromObject(t, obj, round, SEC_TO_NS);
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}
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int
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_PyTime_FromMillisecondsObject(_PyTime_t *t, PyObject *obj, _PyTime_round_t round)
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{
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return _PyTime_FromObject(t, obj, round, MS_TO_NS);
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}
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double
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_PyTime_AsSecondsDouble(_PyTime_t t)
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{
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/* volatile avoids optimization changing how numbers are rounded */
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volatile double d;
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if (t % SEC_TO_NS == 0) {
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_PyTime_t secs;
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/* Divide using integers to avoid rounding issues on the integer part.
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1e-9 cannot be stored exactly in IEEE 64-bit. */
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secs = t / SEC_TO_NS;
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d = (double)secs;
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}
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else {
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d = (double)t;
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d /= 1e9;
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}
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return d;
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}
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|
|
PyObject *
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_PyTime_AsNanosecondsObject(_PyTime_t t)
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{
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Py_BUILD_ASSERT(sizeof(long long) >= sizeof(_PyTime_t));
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return PyLong_FromLongLong((long long)t);
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}
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|
|
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static _PyTime_t
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_PyTime_Divide(const _PyTime_t t, const _PyTime_t k,
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const _PyTime_round_t round)
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|
{
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assert(k > 1);
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if (round == _PyTime_ROUND_HALF_EVEN) {
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_PyTime_t x, r, abs_r;
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x = t / k;
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r = t % k;
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abs_r = Py_ABS(r);
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if (abs_r > k / 2 || (abs_r == k / 2 && (Py_ABS(x) & 1))) {
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if (t >= 0) {
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x++;
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}
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else {
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x--;
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}
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}
|
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return x;
|
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}
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else if (round == _PyTime_ROUND_CEILING) {
|
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if (t >= 0) {
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return (t + k - 1) / k;
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}
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else {
|
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return t / k;
|
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}
|
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}
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else if (round == _PyTime_ROUND_FLOOR){
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if (t >= 0) {
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return t / k;
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}
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else {
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return (t - (k - 1)) / k;
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}
|
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}
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else {
|
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assert(round == _PyTime_ROUND_UP);
|
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if (t >= 0) {
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return (t + k - 1) / k;
|
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}
|
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else {
|
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return (t - (k - 1)) / k;
|
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}
|
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}
|
|
}
|
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|
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_PyTime_t
|
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_PyTime_AsMilliseconds(_PyTime_t t, _PyTime_round_t round)
|
|
{
|
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return _PyTime_Divide(t, NS_TO_MS, round);
|
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}
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|
|
_PyTime_t
|
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_PyTime_AsMicroseconds(_PyTime_t t, _PyTime_round_t round)
|
|
{
|
|
return _PyTime_Divide(t, NS_TO_US, round);
|
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}
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|
|
static int
|
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_PyTime_AsTimeval_impl(_PyTime_t t, _PyTime_t *p_secs, int *p_us,
|
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_PyTime_round_t round)
|
|
{
|
|
_PyTime_t secs, ns;
|
|
int usec;
|
|
int res = 0;
|
|
|
|
secs = t / SEC_TO_NS;
|
|
ns = t % SEC_TO_NS;
|
|
|
|
usec = (int)_PyTime_Divide(ns, US_TO_NS, round);
|
|
if (usec < 0) {
|
|
usec += SEC_TO_US;
|
|
if (secs != _PyTime_MIN) {
|
|
secs -= 1;
|
|
}
|
|
else {
|
|
res = -1;
|
|
}
|
|
}
|
|
else if (usec >= SEC_TO_US) {
|
|
usec -= SEC_TO_US;
|
|
if (secs != _PyTime_MAX) {
|
|
secs += 1;
|
|
}
|
|
else {
|
|
res = -1;
|
|
}
|
|
}
|
|
assert(0 <= usec && usec < SEC_TO_US);
|
|
|
|
*p_secs = secs;
|
|
*p_us = usec;
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
_PyTime_AsTimevalStruct_impl(_PyTime_t t, struct timeval *tv,
|
|
_PyTime_round_t round, int raise)
|
|
{
|
|
_PyTime_t secs, secs2;
|
|
int us;
|
|
int res;
|
|
|
|
res = _PyTime_AsTimeval_impl(t, &secs, &us, round);
|
|
|
|
#ifdef MS_WINDOWS
|
|
tv->tv_sec = (long)secs;
|
|
#else
|
|
tv->tv_sec = secs;
|
|
#endif
|
|
tv->tv_usec = us;
|
|
|
|
secs2 = (_PyTime_t)tv->tv_sec;
|
|
if (res < 0 || secs2 != secs) {
|
|
if (raise) {
|
|
error_time_t_overflow();
|
|
}
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
_PyTime_AsTimeval(_PyTime_t t, struct timeval *tv, _PyTime_round_t round)
|
|
{
|
|
return _PyTime_AsTimevalStruct_impl(t, tv, round, 1);
|
|
}
|
|
|
|
int
|
|
_PyTime_AsTimeval_noraise(_PyTime_t t, struct timeval *tv, _PyTime_round_t round)
|
|
{
|
|
return _PyTime_AsTimevalStruct_impl(t, tv, round, 0);
|
|
}
|
|
|
|
int
|
|
_PyTime_AsTimevalTime_t(_PyTime_t t, time_t *p_secs, int *us,
|
|
_PyTime_round_t round)
|
|
{
|
|
_PyTime_t secs;
|
|
int res;
|
|
|
|
res = _PyTime_AsTimeval_impl(t, &secs, us, round);
|
|
|
|
*p_secs = secs;
|
|
|
|
if (res < 0 || (_PyTime_t)*p_secs != secs) {
|
|
error_time_t_overflow();
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
#if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_KQUEUE)
|
|
int
|
|
_PyTime_AsTimespec(_PyTime_t t, struct timespec *ts)
|
|
{
|
|
_PyTime_t secs, nsec;
|
|
|
|
secs = t / SEC_TO_NS;
|
|
nsec = t % SEC_TO_NS;
|
|
if (nsec < 0) {
|
|
nsec += SEC_TO_NS;
|
|
secs -= 1;
|
|
}
|
|
ts->tv_sec = (time_t)secs;
|
|
assert(0 <= nsec && nsec < SEC_TO_NS);
|
|
ts->tv_nsec = nsec;
|
|
|
|
if ((_PyTime_t)ts->tv_sec != secs) {
|
|
error_time_t_overflow();
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
pygettimeofday(_PyTime_t *tp, _Py_clock_info_t *info, int raise)
|
|
{
|
|
#ifdef MS_WINDOWS
|
|
FILETIME system_time;
|
|
ULARGE_INTEGER large;
|
|
|
|
assert(info == NULL || raise);
|
|
|
|
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). */
|
|
*tp = large.QuadPart * 100 - 11644473600000000000;
|
|
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
|
|
|
|
assert(info == NULL || raise);
|
|
|
|
#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) {
|
|
PyErr_SetFromErrno(PyExc_OSError);
|
|
}
|
|
return -1;
|
|
}
|
|
if (pytime_fromtimespec(tp, &ts, raise) < 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 = res.tv_sec + res.tv_nsec * 1e-9;
|
|
}
|
|
else {
|
|
info->resolution = 1e-9;
|
|
}
|
|
}
|
|
|
|
#ifdef HAVE_CLOCK_GETTIME_RUNTIME
|
|
} else {
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#if !defined(HAVE_CLOCK_GETTIME) || defined(HAVE_CLOCK_GETTIME_RUNTIME)
|
|
|
|
/* test gettimeofday() */
|
|
err = gettimeofday(&tv, (struct timezone *)NULL);
|
|
if (err) {
|
|
if (raise) {
|
|
PyErr_SetFromErrno(PyExc_OSError);
|
|
}
|
|
return -1;
|
|
}
|
|
if (pytime_fromtimeval(tp, &tv, raise) < 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 (pygettimeofday(&t, NULL, 0) < 0) {
|
|
/* should not happen, _PyTime_Init() checked the clock at startup */
|
|
Py_FatalError("pygettimeofday() failed");
|
|
}
|
|
return t;
|
|
}
|
|
|
|
int
|
|
_PyTime_GetSystemClockWithInfo(_PyTime_t *t, _Py_clock_info_t *info)
|
|
{
|
|
return pygettimeofday(t, info, 1);
|
|
}
|
|
|
|
static int
|
|
pymonotonic(_PyTime_t *tp, _Py_clock_info_t *info, int raise)
|
|
{
|
|
#if defined(MS_WINDOWS)
|
|
ULONGLONG ticks;
|
|
_PyTime_t t;
|
|
|
|
assert(info == NULL || raise);
|
|
|
|
ticks = GetTickCount64();
|
|
Py_BUILD_ASSERT(sizeof(ticks) <= sizeof(_PyTime_t));
|
|
t = (_PyTime_t)ticks;
|
|
|
|
if (_PyTime_check_mul_overflow(t, MS_TO_NS)) {
|
|
if (raise) {
|
|
_PyTime_overflow();
|
|
return -1;
|
|
}
|
|
/* Hello, time traveler! */
|
|
Py_FatalError("pymonotonic: integer overflow");
|
|
}
|
|
*tp = t * MS_TO_NS;
|
|
|
|
if (info) {
|
|
DWORD timeAdjustment, timeIncrement;
|
|
BOOL isTimeAdjustmentDisabled, ok;
|
|
info->implementation = "GetTickCount64()";
|
|
info->monotonic = 1;
|
|
ok = GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement,
|
|
&isTimeAdjustmentDisabled);
|
|
if (!ok) {
|
|
PyErr_SetFromWindowsErr(0);
|
|
return -1;
|
|
}
|
|
info->resolution = timeIncrement * 1e-7;
|
|
info->adjustable = 0;
|
|
}
|
|
|
|
#elif defined(__APPLE__)
|
|
static mach_timebase_info_data_t timebase;
|
|
static uint64_t t0 = 0;
|
|
uint64_t ticks;
|
|
|
|
if (timebase.denom == 0) {
|
|
/* 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);
|
|
|
|
/* Sanity check: should never occur in practice */
|
|
if (timebase.numer < 1 || timebase.denom < 1) {
|
|
PyErr_SetString(PyExc_RuntimeError,
|
|
"invalid mach_timebase_info");
|
|
return -1;
|
|
}
|
|
|
|
/* Check that timebase.numer and timebase.denom can be casted to
|
|
_PyTime_t. In practice, timebase uses uint32_t, so casting cannot
|
|
overflow. At the end, only make sure that the type is uint32_t
|
|
(_PyTime_t is 64-bit long). */
|
|
assert(sizeof(timebase.numer) < sizeof(_PyTime_t));
|
|
assert(sizeof(timebase.denom) < sizeof(_PyTime_t));
|
|
|
|
/* Make sure that (ticks * timebase.numer) cannot overflow in
|
|
_PyTime_MulDiv(), with ticks < timebase.denom.
|
|
|
|
Known time bases:
|
|
|
|
* always (1, 1) on Intel
|
|
* (1000000000, 33333335) or (1000000000, 25000000) on PowerPC
|
|
|
|
None of these time bases can overflow with 64-bit _PyTime_t, but
|
|
check for overflow, just in case. */
|
|
if ((_PyTime_t)timebase.numer > _PyTime_MAX / (_PyTime_t)timebase.denom) {
|
|
PyErr_SetString(PyExc_OverflowError,
|
|
"mach_timebase_info is too large");
|
|
return -1;
|
|
}
|
|
|
|
t0 = mach_absolute_time();
|
|
}
|
|
|
|
if (info) {
|
|
info->implementation = "mach_absolute_time()";
|
|
info->resolution = (double)timebase.numer / (double)timebase.denom * 1e-9;
|
|
info->monotonic = 1;
|
|
info->adjustable = 0;
|
|
}
|
|
|
|
ticks = mach_absolute_time();
|
|
/* Use a "time zero" to reduce precision loss when converting time
|
|
to floatting point number, as in time.monotonic(). */
|
|
ticks -= t0;
|
|
*tp = _PyTime_MulDiv(ticks,
|
|
(_PyTime_t)timebase.numer,
|
|
(_PyTime_t)timebase.denom);
|
|
|
|
#elif defined(__hpux)
|
|
hrtime_t time;
|
|
|
|
time = gethrtime();
|
|
if (time == -1) {
|
|
if (raise) {
|
|
PyErr_SetFromErrno(PyExc_OSError);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
*tp = time;
|
|
|
|
if (info) {
|
|
info->implementation = "gethrtime()";
|
|
info->resolution = 1e-9;
|
|
info->monotonic = 1;
|
|
info->adjustable = 0;
|
|
}
|
|
|
|
#else
|
|
struct timespec ts;
|
|
#ifdef CLOCK_HIGHRES
|
|
const clockid_t clk_id = CLOCK_HIGHRES;
|
|
const char *implementation = "clock_gettime(CLOCK_HIGHRES)";
|
|
#else
|
|
const clockid_t clk_id = CLOCK_MONOTONIC;
|
|
const char *implementation = "clock_gettime(CLOCK_MONOTONIC)";
|
|
#endif
|
|
|
|
assert(info == NULL || raise);
|
|
|
|
if (clock_gettime(clk_id, &ts) != 0) {
|
|
if (raise) {
|
|
PyErr_SetFromErrno(PyExc_OSError);
|
|
return -1;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
if (info) {
|
|
struct timespec res;
|
|
info->monotonic = 1;
|
|
info->implementation = implementation;
|
|
info->adjustable = 0;
|
|
if (clock_getres(clk_id, &res) != 0) {
|
|
PyErr_SetFromErrno(PyExc_OSError);
|
|
return -1;
|
|
}
|
|
info->resolution = res.tv_sec + res.tv_nsec * 1e-9;
|
|
}
|
|
if (pytime_fromtimespec(tp, &ts, raise) < 0) {
|
|
return -1;
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
_PyTime_t
|
|
_PyTime_GetMonotonicClock(void)
|
|
{
|
|
_PyTime_t t;
|
|
if (pymonotonic(&t, NULL, 0) < 0) {
|
|
/* should not happen, _PyTime_Init() checked that monotonic clock at
|
|
startup */
|
|
Py_FatalError("pymonotonic() failed");
|
|
}
|
|
return t;
|
|
}
|
|
|
|
int
|
|
_PyTime_GetMonotonicClockWithInfo(_PyTime_t *tp, _Py_clock_info_t *info)
|
|
{
|
|
return pymonotonic(tp, info, 1);
|
|
}
|
|
|
|
|
|
#ifdef MS_WINDOWS
|
|
static int
|
|
win_perf_counter(_PyTime_t *tp, _Py_clock_info_t *info)
|
|
{
|
|
static LONGLONG frequency = 0;
|
|
static LONGLONG t0 = 0;
|
|
LARGE_INTEGER now;
|
|
LONGLONG ticksll;
|
|
_PyTime_t ticks;
|
|
|
|
if (frequency == 0) {
|
|
LARGE_INTEGER freq;
|
|
if (!QueryPerformanceFrequency(&freq)) {
|
|
PyErr_SetFromWindowsErr(0);
|
|
return -1;
|
|
}
|
|
frequency = freq.QuadPart;
|
|
|
|
/* Sanity check: should never occur in practice */
|
|
if (frequency < 1) {
|
|
PyErr_SetString(PyExc_RuntimeError,
|
|
"invalid QueryPerformanceFrequency");
|
|
return -1;
|
|
}
|
|
|
|
/* Check that frequency can be casted to _PyTime_t.
|
|
|
|
Make also sure that (ticks * SEC_TO_NS) cannot overflow in
|
|
_PyTime_MulDiv(), with ticks < frequency.
|
|
|
|
Known QueryPerformanceFrequency() values:
|
|
|
|
* 10,000,000 (10 MHz): 100 ns resolution
|
|
* 3,579,545 Hz (3.6 MHz): 279 ns resolution
|
|
|
|
None of these frequencies can overflow with 64-bit _PyTime_t, but
|
|
check for overflow, just in case. */
|
|
if (frequency > _PyTime_MAX
|
|
|| frequency > (LONGLONG)_PyTime_MAX / (LONGLONG)SEC_TO_NS) {
|
|
PyErr_SetString(PyExc_OverflowError,
|
|
"QueryPerformanceFrequency is too large");
|
|
return -1;
|
|
}
|
|
|
|
QueryPerformanceCounter(&now);
|
|
t0 = now.QuadPart;
|
|
}
|
|
|
|
if (info) {
|
|
info->implementation = "QueryPerformanceCounter()";
|
|
info->resolution = 1.0 / (double)frequency;
|
|
info->monotonic = 1;
|
|
info->adjustable = 0;
|
|
}
|
|
|
|
QueryPerformanceCounter(&now);
|
|
ticksll = now.QuadPart;
|
|
|
|
/* Use a "time zero" to reduce precision loss when converting time
|
|
to floatting point number, as in time.perf_counter(). */
|
|
ticksll -= t0;
|
|
|
|
/* Make sure that casting LONGLONG to _PyTime_t cannot overflow,
|
|
both types are signed */
|
|
Py_BUILD_ASSERT(sizeof(ticksll) <= sizeof(ticks));
|
|
ticks = (_PyTime_t)ticksll;
|
|
|
|
*tp = _PyTime_MulDiv(ticks, SEC_TO_NS, (_PyTime_t)frequency);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
|
|
int
|
|
_PyTime_GetPerfCounterWithInfo(_PyTime_t *t, _Py_clock_info_t *info)
|
|
{
|
|
#ifdef MS_WINDOWS
|
|
return win_perf_counter(t, info);
|
|
#else
|
|
return _PyTime_GetMonotonicClockWithInfo(t, info);
|
|
#endif
|
|
}
|
|
|
|
|
|
_PyTime_t
|
|
_PyTime_GetPerfCounter(void)
|
|
{
|
|
_PyTime_t t;
|
|
if (_PyTime_GetPerfCounterWithInfo(&t, NULL)) {
|
|
Py_FatalError("_PyTime_GetPerfCounterWithInfo() failed");
|
|
}
|
|
return t;
|
|
}
|
|
|
|
|
|
int
|
|
_PyTime_Init(void)
|
|
{
|
|
/* 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;
|
|
if (_PyTime_GetSystemClockWithInfo(&t, NULL) < 0) {
|
|
return -1;
|
|
}
|
|
if (_PyTime_GetMonotonicClockWithInfo(&t, NULL) < 0) {
|
|
return -1;
|
|
}
|
|
if (_PyTime_GetPerfCounterWithInfo(&t, NULL) < 0) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
_PyTime_localtime(time_t t, struct tm *tm)
|
|
{
|
|
#ifdef MS_WINDOWS
|
|
int error;
|
|
|
|
error = localtime_s(tm, &t);
|
|
if (error != 0) {
|
|
errno = error;
|
|
PyErr_SetFromErrno(PyExc_OSError);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
#else /* !MS_WINDOWS */
|
|
|
|
#if defined(_AIX) && (SIZEOF_TIME_T < 8)
|
|
/* bpo-34373: AIX does not return NULL if t is too small or too large */
|
|
if (t < -2145916800 /* 1902-01-01 */
|
|
|| t > 2145916800 /* 2038-01-01 */) {
|
|
errno = EINVAL;
|
|
PyErr_SetString(PyExc_OverflowError,
|
|
"localtime argument out of range");
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
errno = 0;
|
|
if (localtime_r(&t, tm) == NULL) {
|
|
if (errno == 0) {
|
|
errno = EINVAL;
|
|
}
|
|
PyErr_SetFromErrno(PyExc_OSError);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
#endif /* MS_WINDOWS */
|
|
}
|
|
|
|
int
|
|
_PyTime_gmtime(time_t t, struct tm *tm)
|
|
{
|
|
#ifdef MS_WINDOWS
|
|
int error;
|
|
|
|
error = gmtime_s(tm, &t);
|
|
if (error != 0) {
|
|
errno = error;
|
|
PyErr_SetFromErrno(PyExc_OSError);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
#else /* !MS_WINDOWS */
|
|
if (gmtime_r(&t, tm) == NULL) {
|
|
#ifdef EINVAL
|
|
if (errno == 0) {
|
|
errno = EINVAL;
|
|
}
|
|
#endif
|
|
PyErr_SetFromErrno(PyExc_OSError);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
#endif /* MS_WINDOWS */
|
|
}
|