CMake.git - CMake is a cross-platform, open-source build system generator.

path: root/Help/guide/tutorial/MultiPackage/MathFunctions/MathFunctions.cxx

diff options

author	Kitware Robot <kwrobot@kitware.com>	2019-06-02 04:01:04 (GMT)
committer	Kitware Robot <kwrobot@kitware.com>	2019-06-02 04:01:04 (GMT)
commit	51e7488c03f29ae6247d5012fed7dc3fa7924ce0 (patch)
tree	5eb6b537432dd7135e3ee71108355ff3c12290cb /Help/guide/tutorial/MultiPackage/MathFunctions/MathFunctions.cxx
parent	7f4a1d83790cad143dc8400cc78186dbef88e23d (diff)
download	CMake-51e7488c03f29ae6247d5012fed7dc3fa7924ce0.zip CMake-51e7488c03f29ae6247d5012fed7dc3fa7924ce0.tar.gz CMake-51e7488c03f29ae6247d5012fed7dc3fa7924ce0.tar.bz2

CMake Nightly Date Stamp

Diffstat (limited to 'Help/guide/tutorial/MultiPackage/MathFunctions/MathFunctions.cxx')

0 files changed, 0 insertions, 0 deletions

ef='#n149'>149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252

#include "Python.h"
#ifdef MS_WINDOWS
#include <windows.h>
#endif

#if defined(__APPLE__) && defined(HAVE_GETTIMEOFDAY) && defined(HAVE_FTIME)
  /*
   * _PyTime_gettimeofday falls back to ftime when getttimeofday fails because the latter
   * might fail on some platforms. This fallback is unwanted on MacOSX because
   * that makes it impossible to use a binary build on OSX 10.4 on earlier
   * releases of the OS. Therefore claim we don't support ftime.
   */
# undef HAVE_FTIME
#endif

#if defined(HAVE_FTIME) && !defined(MS_WINDOWS)
#include <sys/timeb.h>
extern int ftime(struct timeb *);
#endif

static void
pygettimeofday(_PyTime_timeval *tp, _Py_clock_info_t *info)
{
#ifdef MS_WINDOWS
    FILETIME system_time;
    ULARGE_INTEGER large;
    ULONGLONG microseconds;

    GetSystemTimeAsFileTime(&system_time);
    large.u.LowPart = system_time.dwLowDateTime;
    large.u.HighPart = system_time.dwHighDateTime;
    /* 11,644,473,600,000,000: number of microseconds between
       the 1st january 1601 and the 1st january 1970 (369 years + 89 leap
       days). */
    microseconds = large.QuadPart / 10 - 11644473600000000;
    tp->tv_sec = microseconds / 1000000;
    tp->tv_usec = microseconds % 1000000;
    if (info) {
        DWORD timeAdjustment, timeIncrement;
        BOOL isTimeAdjustmentDisabled;

        info->implementation = "GetSystemTimeAsFileTime()";
        info->monotonic = 0;
        (void) GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement,
                                       &isTimeAdjustmentDisabled);
        info->resolution = timeIncrement * 1e-7;
        info->adjustable = 1;
    }
#else
    /* There are three ways to get the time:
      (1) gettimeofday() -- resolution in microseconds
      (2) ftime() -- resolution in milliseconds
      (3) time() -- resolution in seconds
      In all cases the return value in a timeval struct.
      Since on some systems (e.g. SCO ODT 3.0) gettimeofday() may
      fail, so we fall back on ftime() or time().
      Note: clock resolution does not imply clock accuracy! */

#ifdef HAVE_GETTIMEOFDAY
    int err;
#ifdef GETTIMEOFDAY_NO_TZ
    err = gettimeofday(tp);
#else
    err = gettimeofday(tp, (struct timezone *)NULL);
#endif
    if (err == 0) {
        if (info) {
            info->implementation = "gettimeofday()";
            info->resolution = 1e-6;
            info->monotonic = 0;
            info->adjustable = 1;
        }
        return;
    }
#endif   /* HAVE_GETTIMEOFDAY */

#if defined(HAVE_FTIME)
    {
        struct timeb t;
        ftime(&t);
        tp->tv_sec = t.time;
        tp->tv_usec = t.millitm * 1000;
        if (info) {
            info->implementation = "ftime()";
            info->resolution = 1e-3;
            info->monotonic = 0;
            info->adjustable = 1;
        }
    }
#else /* !HAVE_FTIME */
    tp->tv_sec = time(NULL);
    tp->tv_usec = 0;
    if (info) {
        info->implementation = "time()";
        info->resolution = 1.0;
        info->monotonic = 0;
        info->adjustable = 1;
    }
#endif /* !HAVE_FTIME */

#endif /* MS_WINDOWS */
}

void
_PyTime_gettimeofday(_PyTime_timeval *tp)
{
    pygettimeofday(tp, NULL);
}

void
_PyTime_gettimeofday_info(_PyTime_timeval *tp, _Py_clock_info_t *info)
{
    pygettimeofday(tp, info);
}

static void
error_time_t_overflow(void)
{
    PyErr_SetString(PyExc_OverflowError,
                    "timestamp out of range for platform time_t");
}

time_t
_PyLong_AsTime_t(PyObject *obj)
{
#if defined(HAVE_LONG_LONG) && SIZEOF_TIME_T == SIZEOF_LONG_LONG
    PY_LONG_LONG val;
    val = PyLong_AsLongLong(obj);
#else
    long val;
    assert(sizeof(time_t) <= sizeof(long));
    val = PyLong_AsLong(obj);
#endif
    if (val == -1 && PyErr_Occurred()) {
        if (PyErr_ExceptionMatches(PyExc_OverflowError))
            error_time_t_overflow();
        return -1;
    }
    return (time_t)val;
}

PyObject *
_PyLong_FromTime_t(time_t t)
{
#if defined(HAVE_LONG_LONG) && SIZEOF_TIME_T == SIZEOF_LONG_LONG
    return PyLong_FromLongLong((PY_LONG_LONG)t);
#else
    assert(sizeof(time_t) <= sizeof(long));
    return PyLong_FromLong((long)t);
#endif
}

static int
_PyTime_ObjectToDenominator(PyObject *obj, time_t *sec, long *numerator,
                            double denominator, _PyTime_round_t round)
{
    assert(denominator <= LONG_MAX);
    if (PyFloat_Check(obj)) {
        double d, intpart, err;
        /* volatile avoids unsafe optimization on float enabled by gcc -O3 */
        volatile double floatpart;

        d = PyFloat_AsDouble(obj);
        floatpart = modf(d, &intpart);
        if (floatpart < 0) {
            floatpart = 1.0 + floatpart;
            intpart -= 1.0;
        }

        floatpart *= denominator;
        if (round == _PyTime_ROUND_UP) {
            if (intpart >= 0) {
                floatpart = ceil(floatpart);
                if (floatpart >= denominator) {
                    floatpart = 0.0;
                    intpart += 1.0;
                }
            }
            else {
                floatpart = floor(floatpart);
            }
        }

        *sec = (time_t)intpart;
        err = intpart - (double)*sec;
        if (err <= -1.0 || err >= 1.0) {
            error_time_t_overflow();
            return -1;
        }

        *numerator = (long)floatpart;
        return 0;
    }
    else {
        *sec = _PyLong_AsTime_t(obj);
        if (*sec == (time_t)-1 && PyErr_Occurred())
            return -1;
        *numerator = 0;
        return 0;
    }
}

int
_PyTime_ObjectToTime_t(PyObject *obj, time_t *sec, _PyTime_round_t round)
{
    if (PyFloat_Check(obj)) {
        double d, intpart, err;

        d = PyFloat_AsDouble(obj);
        if (round == _PyTime_ROUND_UP) {
            if (d >= 0)
                d = ceil(d);
            else
                d = floor(d);
        }
        (void)modf(d, &intpart);

        *sec = (time_t)intpart;
        err = intpart - (double)*sec;
        if (err <= -1.0 || err >= 1.0) {
            error_time_t_overflow();
            return -1;
        }
        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_ObjectToDenominator(obj, sec, nsec, 1e9, round);
}

int
_PyTime_ObjectToTimeval(PyObject *obj, time_t *sec, long *usec,
                        _PyTime_round_t round)
{
    return _PyTime_ObjectToDenominator(obj, sec, usec, 1e6, round);
}

void
_PyTime_Init()
{
    /* Do nothing.  Needed to force linking. */
}


context:
space:
mode: