add ydb deps

1 files changed, 1374 insertions, 0 deletions

diff --git a/contrib/tools/python3/src/Python/pytime.c b/contrib/tools/python3/src/Python/pytime.c
new file mode 100644
index 0000000000..f4f112feae
--- /dev/null
+++ b/contrib/tools/python3/src/Python/pytime.c
@@ -0,0 +1,1374 @@
+#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
+#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
+
+#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);
+
+    /* Sanity check: should never occur in practice */
+    if (timebase.numer < 1 || timebase.denom < 1) {
+        if (raise) {
+            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). */
+    static_assert(sizeof(timebase.numer) <= sizeof(_PyTime_t),
+                  "timebase.numer is larger than _PyTime_t");
+    static_assert(sizeof(timebase.denom) <= sizeof(_PyTime_t),
+                  "timebase.denom is larger than _PyTime_t");
+
+    /* Make sure that _PyTime_MulDiv(ticks, timebase_numer, timebase_denom)
+       cannot overflow.
+
+       Known time bases:
+
+       * (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) {
+        if (raise) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "mach_timebase_info is too large");
+        }
+        return -1;
+    }
+
+    *pnumer = (_PyTime_t)timebase.numer;
+    *pdenom = (_PyTime_t)timebase.denom;
+    return 0;
+}
+#endif
+
+
+static int
+py_get_monotonic_clock(_PyTime_t *tp, _Py_clock_info_t *info, int raise_exc)
+{
+    assert(info == NULL || raise_exc);
+
+#if defined(MS_WINDOWS)
+    ULONGLONG ticks = GetTickCount64();
+    static_assert(sizeof(ticks) <= sizeof(_PyTime_t),
+                  "ULONGLONG is larger than _PyTime_t");
+    _PyTime_t t;
+    if (ticks <= (ULONGLONG)_PyTime_MAX) {
+        t = (_PyTime_t)ticks;
+    }
+    else {
+        // GetTickCount64() maximum is larger than _PyTime_t maximum:
+        // ULONGLONG is unsigned, whereas _PyTime_t is signed.
+        t = _PyTime_MAX;
+    }
+
+    int res = pytime_mul(&t, MS_TO_NS);
+    *tp = t;
+
+    if (raise_exc && res < 0) {
+        pytime_overflow();
+        return -1;
+    }
+
+    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 _PyTime_t timebase_numer = 0;
+    static _PyTime_t timebase_denom = 0;
+    if (timebase_denom == 0) {
+        if (py_mach_timebase_info(&timebase_numer, &timebase_denom, raise_exc) < 0) {
+            return -1;
+        }
+    }
+
+    if (info) {
+        info->implementation = "mach_absolute_time()";
+        info->resolution = (double)timebase_numer / (double)timebase_denom * 1e-9;
+        info->monotonic = 1;
+        info->adjustable = 0;
+    }
+
+    uint64_t uticks = mach_absolute_time();
+    // unsigned => signed
+    assert(uticks <= (uint64_t)_PyTime_MAX);
+    _PyTime_t ticks = (_PyTime_t)uticks;
+
+    _PyTime_t ns = _PyTime_MulDiv(ticks, timebase_numer, timebase_denom);
+    *tp = pytime_from_nanoseconds(ns);
+
+#elif defined(__hpux)
+    hrtime_t time;
+
+    time = gethrtime();
+    if (time == -1) {
+        if (raise_exc) {
+            PyErr_SetFromErrno(PyExc_OSError);
+        }
+        return -1;
+    }
+
+    *tp = pytime_from_nanoseconds(time);
+
+    if (info) {
+        info->implementation = "gethrtime()";
+        info->resolution = 1e-9;
+        info->monotonic = 1;
+        info->adjustable = 0;
+    }
+
+#else
+
+#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
+
+    struct timespec ts;
+    if (clock_gettime(clk_id, &ts) != 0) {
+        if (raise_exc) {
+            PyErr_SetFromErrno(PyExc_OSError);
+            return -1;
+        }
+        return -1;
+    }
+
+    if (pytime_fromtimespec(tp, &ts, raise_exc) < 0) {
+        return -1;
+    }
+
+    if (info) {
+        info->monotonic = 1;
+        info->implementation = implementation;
+        info->adjustable = 0;
+        struct timespec res;
+        if (clock_getres(clk_id, &res) != 0) {
+            PyErr_SetFromErrno(PyExc_OSError);
+            return -1;
+        }
+        info->resolution = res.tv_sec + res.tv_nsec * 1e-9;
+    }
+#endif
+    return 0;
+}
+
+
+_PyTime_t
+_PyTime_GetMonotonicClock(void)
+{
+    _PyTime_t t;
+    if (py_get_monotonic_clock(&t, NULL, 0) < 0) {
+        // If mach_timebase_info(), clock_gettime() or gethrtime() fails:
+        // silently ignore the failure and return 0.
+        t = 0;
+    }
+    return t;
+}
+
+
+int
+_PyTime_GetMonotonicClockWithInfo(_PyTime_t *tp, _Py_clock_info_t *info)
+{
+    return py_get_monotonic_clock(tp, info, 1);
+}
+
+
+#ifdef MS_WINDOWS
+static int
+py_win_perf_counter_frequency(LONGLONG *pfrequency, int raise)
+{
+    LONGLONG frequency;
+
+    LARGE_INTEGER freq;
+    // Since Windows XP, the function cannot fail.
+    (void)QueryPerformanceFrequency(&freq);
+    frequency = freq.QuadPart;
+
+    // Since Windows XP, frequency cannot be zero.
+    assert(frequency >= 1);
+
+    /* 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 integer overflow just in case. */
+    if (frequency > _PyTime_MAX / SEC_TO_NS) {
+        if (raise) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "QueryPerformanceFrequency is too large");
+        }
+        return -1;
+    }
+
+    *pfrequency = frequency;
+    return 0;
+}
+
+
+static int
+py_get_win_perf_counter(_PyTime_t *tp, _Py_clock_info_t *info, int raise_exc)
+{
+    assert(info == NULL || raise_exc);
+
+    static LONGLONG frequency = 0;
+    if (frequency == 0) {
+        if (py_win_perf_counter_frequency(&frequency, raise_exc) < 0) {
+            return -1;
+        }
+    }
+
+    if (info) {
+        info->implementation = "QueryPerformanceCounter()";
+        info->resolution = 1.0 / (double)frequency;
+        info->monotonic = 1;
+        info->adjustable = 0;
+    }
+
+    LARGE_INTEGER now;
+    QueryPerformanceCounter(&now);
+    LONGLONG ticksll = now.QuadPart;
+
+    /* Make sure that casting LONGLONG to _PyTime_t cannot overflow,
+       both types are signed */
+    _PyTime_t ticks;
+    static_assert(sizeof(ticksll) <= sizeof(ticks),
+                  "LONGLONG is larger than _PyTime_t");
+    ticks = (_PyTime_t)ticksll;
+
+    _PyTime_t ns = _PyTime_MulDiv(ticks, SEC_TO_NS, (_PyTime_t)frequency);
+    *tp = pytime_from_nanoseconds(ns);
+    return 0;
+}
+#endif  // MS_WINDOWS
+
+
+int
+_PyTime_GetPerfCounterWithInfo(_PyTime_t *t, _Py_clock_info_t *info)
+{
+#ifdef MS_WINDOWS
+    return py_get_win_perf_counter(t, info, 1);
+#else
+    return _PyTime_GetMonotonicClockWithInfo(t, info);
+#endif
+}
+
+
+_PyTime_t
+_PyTime_GetPerfCounter(void)
+{
+    _PyTime_t t;
+    int res;
+#ifdef MS_WINDOWS
+    res = py_get_win_perf_counter(&t, NULL, 0);
+#else
+    res = py_get_monotonic_clock(&t, NULL, 0);
+#endif
+    if (res  < 0) {
+        // If py_win_perf_counter_frequency() or py_get_monotonic_clock()
+        // fails: silently ignore the failure and return 0.
+        t = 0;
+    }
+    return t;
+}
+
+
+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 */
+}
+
+
+_PyTime_t
+_PyDeadline_Init(_PyTime_t timeout)
+{
+    _PyTime_t now = _PyTime_GetMonotonicClock();
+    return _PyTime_Add(now, timeout);
+}
+
+
+_PyTime_t
+_PyDeadline_Get(_PyTime_t deadline)
+{
+    _PyTime_t now = _PyTime_GetMonotonicClock();
+    return deadline - now;
+}