782 lines
18 KiB
C
782 lines
18 KiB
C
#include "Python.h"
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#ifdef MS_WINDOWS
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#include <windows.h>
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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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#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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time_t
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_PyLong_AsTime_t(PyObject *obj)
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{
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#if defined(HAVE_LONG_LONG) && SIZEOF_TIME_T == SIZEOF_LONG_LONG
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PY_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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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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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 defined(HAVE_LONG_LONG) && SIZEOF_TIME_T == SIZEOF_LONG_LONG
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return PyLong_FromLongLong((PY_LONG_LONG)t);
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#else
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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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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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else if (round == _PyTime_ROUND_CEILING)
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d = ceil(d);
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else
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d = floor(d);
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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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double denominator, _PyTime_round_t round)
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{
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double intpart, err;
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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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*sec = (time_t)intpart;
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*numerator = (long)floatpart;
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err = intpart - (double)*sec;
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if (err <= -1.0 || err >= 1.0) {
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error_time_t_overflow();
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return -1;
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}
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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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double denominator, _PyTime_round_t round)
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{
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assert(denominator <= (double)LONG_MAX);
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if (PyFloat_Check(obj)) {
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double d = PyFloat_AsDouble(obj);
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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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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, err;
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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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d = _PyTime_Round(d, round);
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(void)modf(d, &intpart);
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*sec = (time_t)intpart;
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err = intpart - (double)*sec;
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if (err <= -1.0 || err >= 1.0) {
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error_time_t_overflow();
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return -1;
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}
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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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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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int res;
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res = _PyTime_ObjectToDenominator(obj, sec, nsec, 1e9, round);
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assert(0 <= *nsec && *nsec < SEC_TO_NS);
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return res;
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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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int res;
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res = _PyTime_ObjectToDenominator(obj, sec, usec, 1e6, round);
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assert(0 <= *usec && *usec < SEC_TO_US);
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return res;
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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_FromSeconds(int seconds)
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{
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_PyTime_t t;
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t = (_PyTime_t)seconds;
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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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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(PY_LONG_LONG ns)
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{
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_PyTime_t t;
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assert(sizeof(PY_LONG_LONG) <= sizeof(_PyTime_t));
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t = Py_SAFE_DOWNCAST(ns, PY_LONG_LONG, _PyTime_t);
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return t;
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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;
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int res = 0;
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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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res = -1;
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}
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t = t * SEC_TO_NS;
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t += ts->tv_nsec;
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*tp = t;
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return res;
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}
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#elif !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;
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int res = 0;
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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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res = -1;
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}
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t = t * SEC_TO_NS;
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t += (_PyTime_t)tv->tv_usec * US_TO_NS;
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*tp = t;
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return res;
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}
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#endif
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static int
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_PyTime_FromFloatObject(_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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double err;
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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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*t = (_PyTime_t)d;
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err = d - (double)*t;
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if (fabs(err) >= 1.0) {
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_PyTime_overflow();
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return -1;
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}
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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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return _PyTime_FromFloatObject(t, d, round, unit_to_ns);
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}
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else {
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#ifdef HAVE_LONG_LONG
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PY_LONG_LONG sec;
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assert(sizeof(PY_LONG_LONG) <= sizeof(_PyTime_t));
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sec = PyLong_AsLongLong(obj);
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#else
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long sec;
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assert(sizeof(PY_LONG_LONG) <= sizeof(_PyTime_t));
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sec = PyLong_AsLong(obj);
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#endif
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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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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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#ifdef HAVE_LONG_LONG
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assert(sizeof(PY_LONG_LONG) >= sizeof(_PyTime_t));
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return PyLong_FromLongLong((PY_LONG_LONG)t);
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#else
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assert(sizeof(long) >= sizeof(_PyTime_t));
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return PyLong_FromLong((long)t);
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#endif
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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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else
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x--;
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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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else
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return t / k;
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}
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else {
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if (t >= 0)
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return t / k;
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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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_PyTime_t
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_PyTime_AsMilliseconds(_PyTime_t t, _PyTime_round_t round)
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{
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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)
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{
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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)
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{
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_PyTime_t secs, ns;
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int usec;
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int res = 0;
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secs = t / SEC_TO_NS;
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ns = t % SEC_TO_NS;
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usec = (int)_PyTime_Divide(ns, US_TO_NS, round);
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if (usec < 0) {
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usec += SEC_TO_US;
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if (secs != _PyTime_MIN)
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secs -= 1;
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else
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res = -1;
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}
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else if (usec >= SEC_TO_US) {
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usec -= SEC_TO_US;
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if (secs != _PyTime_MAX)
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secs += 1;
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else
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res = -1;
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}
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assert(0 <= usec && usec < SEC_TO_US);
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*p_secs = secs;
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*p_us = usec;
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return res;
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}
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static int
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_PyTime_AsTimevalStruct_impl(_PyTime_t t, struct timeval *tv,
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_PyTime_round_t round, int raise)
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{
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_PyTime_t secs, secs2;
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int us;
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int res;
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res = _PyTime_AsTimeval_impl(t, &secs, &us, round);
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#ifdef MS_WINDOWS
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tv->tv_sec = (long)secs;
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#else
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tv->tv_sec = secs;
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#endif
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tv->tv_usec = us;
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secs2 = (_PyTime_t)tv->tv_sec;
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if (res < 0 || secs2 != secs) {
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if (raise)
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error_time_t_overflow();
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return -1;
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}
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return 0;
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}
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int
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_PyTime_AsTimeval(_PyTime_t t, struct timeval *tv, _PyTime_round_t round)
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{
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return _PyTime_AsTimevalStruct_impl(t, tv, round, 1);
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}
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int
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_PyTime_AsTimeval_noraise(_PyTime_t t, struct timeval *tv, _PyTime_round_t round)
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{
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return _PyTime_AsTimevalStruct_impl(t, tv, round, 0);
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}
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int
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_PyTime_AsTimevalTime_t(_PyTime_t t, time_t *p_secs, int *us,
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_PyTime_round_t round)
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{
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_PyTime_t secs;
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int res;
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res = _PyTime_AsTimeval_impl(t, &secs, us, round);
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*p_secs = secs;
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if (res < 0 || (_PyTime_t)*p_secs != secs) {
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error_time_t_overflow();
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return -1;
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}
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return 0;
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}
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#if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_KQUEUE)
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int
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_PyTime_AsTimespec(_PyTime_t t, struct timespec *ts)
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{
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_PyTime_t secs, nsec;
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secs = t / SEC_TO_NS;
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nsec = t % SEC_TO_NS;
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if (nsec < 0) {
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nsec += SEC_TO_NS;
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secs -= 1;
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}
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ts->tv_sec = (time_t)secs;
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assert(0 <= nsec && nsec < SEC_TO_NS);
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ts->tv_nsec = nsec;
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if ((_PyTime_t)ts->tv_sec != secs) {
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error_time_t_overflow();
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return -1;
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}
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return 0;
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}
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#endif
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static int
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pygettimeofday_new(_PyTime_t *tp, _Py_clock_info_t *info, int raise)
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{
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#ifdef MS_WINDOWS
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FILETIME system_time;
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ULARGE_INTEGER large;
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assert(info == NULL || raise);
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GetSystemTimeAsFileTime(&system_time);
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large.u.LowPart = system_time.dwLowDateTime;
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large.u.HighPart = system_time.dwHighDateTime;
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/* 11,644,473,600,000,000,000: number of nanoseconds between
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|
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;
|
|
#ifdef HAVE_CLOCK_GETTIME
|
|
struct timespec ts;
|
|
#else
|
|
struct timeval tv;
|
|
#endif
|
|
|
|
assert(info == NULL || raise);
|
|
|
|
#ifdef HAVE_CLOCK_GETTIME
|
|
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;
|
|
}
|
|
#else /* HAVE_CLOCK_GETTIME */
|
|
|
|
/* test gettimeofday() */
|
|
#ifdef GETTIMEOFDAY_NO_TZ
|
|
err = gettimeofday(&tv);
|
|
#else
|
|
err = gettimeofday(&tv, (struct timezone *)NULL);
|
|
#endif
|
|
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;
|
|
}
|
|
#endif /* !HAVE_CLOCK_GETTIME */
|
|
#endif /* !MS_WINDOWS */
|
|
return 0;
|
|
}
|
|
|
|
_PyTime_t
|
|
_PyTime_GetSystemClock(void)
|
|
{
|
|
_PyTime_t t;
|
|
if (pygettimeofday_new(&t, NULL, 0) < 0) {
|
|
/* should not happen, _PyTime_Init() checked the clock at startup */
|
|
assert(0);
|
|
|
|
/* use a fixed value instead of a random value from the stack */
|
|
t = 0;
|
|
}
|
|
return t;
|
|
}
|
|
|
|
int
|
|
_PyTime_GetSystemClockWithInfo(_PyTime_t *t, _Py_clock_info_t *info)
|
|
{
|
|
return pygettimeofday_new(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();
|
|
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! */
|
|
assert(0);
|
|
}
|
|
*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;
|
|
uint64_t time;
|
|
|
|
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);
|
|
}
|
|
|
|
time = mach_absolute_time();
|
|
|
|
/* apply timebase factor */
|
|
time *= timebase.numer;
|
|
time /= timebase.denom;
|
|
|
|
*tp = time;
|
|
|
|
if (info) {
|
|
info->implementation = "mach_absolute_time()";
|
|
info->resolution = (double)timebase.numer / timebase.denom * 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 */
|
|
assert(0);
|
|
|
|
/* use a fixed value instead of a random value from the stack */
|
|
t = 0;
|
|
}
|
|
return t;
|
|
}
|
|
|
|
int
|
|
_PyTime_GetMonotonicClockWithInfo(_PyTime_t *tp, _Py_clock_info_t *info)
|
|
{
|
|
return pymonotonic(tp, info, 1);
|
|
}
|
|
|
|
int
|
|
_PyTime_Init(void)
|
|
{
|
|
_PyTime_t t;
|
|
|
|
/* ensure that the system clock works */
|
|
if (_PyTime_GetSystemClockWithInfo(&t, NULL) < 0)
|
|
return -1;
|
|
|
|
/* ensure that the operating system provides a monotonic clock */
|
|
if (_PyTime_GetMonotonicClockWithInfo(&t, NULL) < 0)
|
|
return -1;
|
|
|
|
/* check that _PyTime_FromSeconds() cannot overflow */
|
|
assert(INT_MAX <= _PyTime_MAX / SEC_TO_NS);
|
|
assert(INT_MIN >= _PyTime_MIN / SEC_TO_NS);
|
|
return 0;
|
|
}
|