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#include "Python.h"
#ifdef MS_WINDOWS
#include
#endif
#if defined(__APPLE__)
#include /* mach_absolute_time(), mach_timebase_info() */
#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)
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) tv_sec) {
if (raise)
_PyTime_overflow();
res = -1;
}
t += ts->tv_nsec;
*tp = t;
return res;
}
#elif !defined(MS_WINDOWS)
static int
_PyTime_FromTimeval(_PyTime_t *tp, struct timeval *tv, int raise)
{
_PyTime_t t;
int res = 0;
t = (_PyTime_t)tv->tv_sec * SEC_TO_NS;
if (t / SEC_TO_NS != tv->tv_sec) {
if (raise)
_PyTime_overflow();
res = -1;
}
t += (_PyTime_t)tv->tv_usec * US_TO_NS;
*tp = t;
return res;
}
#endif
static int
_PyTime_FromObject(_PyTime_t *t, PyObject *obj, _PyTime_round_t round,
long to_nanoseconds)
{
if (PyFloat_Check(obj)) {
/* volatile avoids unsafe optimization on float enabled by gcc -O3 */
volatile double d, err;
/* convert to a number of nanoseconds */
d = PyFloat_AsDouble(obj);
d *= to_nanoseconds;
if (round == _PyTime_ROUND_CEILING)
d = ceil(d);
else
d = floor(d);
*t = (_PyTime_t)d;
err = d - (double)*t;
if (fabs(err) >= 1.0) {
_PyTime_overflow();
return -1;
}
return 0;
}
else {
#ifdef HAVE_LONG_LONG
PY_LONG_LONG sec;
sec = PyLong_AsLongLong(obj);
assert(sizeof(PY_LONG_LONG) = sizeof(_PyTime_t));
return PyLong_FromLong((long)t);
#endif
}
static _PyTime_t
_PyTime_Divide(_PyTime_t t, _PyTime_t k, _PyTime_round_t round)
{
assert(k > 1);
if (round == _PyTime_ROUND_CEILING) {
if (t >= 0)
return (t + k - 1) / k;
else
return (t - (k - 1)) / k;
}
else
return t / k;
}
_PyTime_t
_PyTime_AsMilliseconds(_PyTime_t t, _PyTime_round_t round)
{
return _PyTime_Divide(t, NS_TO_MS, round);
}
_PyTime_t
_PyTime_AsMicroseconds(_PyTime_t t, _PyTime_round_t round)
{
return _PyTime_Divide(t, NS_TO_US, round);
}
static int
_PyTime_AsTimeval_impl(_PyTime_t t, struct timeval *tv, _PyTime_round_t round,
int raise)
{
_PyTime_t secs, ns;
int res = 0;
secs = t / SEC_TO_NS;
ns = t % SEC_TO_NS;
if (ns < 0) {
ns += SEC_TO_NS;
secs -= 1;
}
#ifdef MS_WINDOWS
/* On Windows, timeval.tv_sec is a long (32 bit),
whereas time_t can be 64-bit. */
assert(sizeof(tv->tv_sec) == sizeof(long));
#if SIZEOF_TIME_T > SIZEOF_LONG
if (secs > LONG_MAX) {
secs = LONG_MAX;
res = -1;
}
else if (secs < LONG_MIN) {
secs = LONG_MIN;
res = -1;
}
#endif
tv->tv_sec = (long)secs;
#else
/* On OpenBSD 5.4, timeval.tv_sec is a long.
Example: long is 64-bit, whereas time_t is 32-bit. */
tv->tv_sec = secs;
if ((_PyTime_t)tv->tv_sec != secs)
res = -1;
#endif
if (round == _PyTime_ROUND_CEILING)
tv->tv_usec = (int)((ns + US_TO_NS - 1) / US_TO_NS);
else
tv->tv_usec = (int)(ns / US_TO_NS);
if (tv->tv_usec >= SEC_TO_US) {
tv->tv_usec -= SEC_TO_US;
tv->tv_sec += 1;
}
if (res && raise)
_PyTime_overflow();
assert(0 tv_usec && tv->tv_usec tv_sec = (time_t)secs;
if ((_PyTime_t)ts->tv_sec != secs) {
_PyTime_overflow();
return -1;
}
ts->tv_nsec = nsec;
assert(0 tv_nsec && ts->tv_nsec 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_new(_PyTime_t *tp, _Py_clock_info_t *info, int raise)
{
#if defined(MS_WINDOWS)
ULONGLONG result;
assert(info == NULL || raise);
result = GetTickCount64();
*tp = result * MS_TO_NS;
if (*tp / MS_TO_NS != result) {
if (raise) {
_PyTime_overflow();
return -1;
}
/* Hello, time traveler! */
assert(0);
}
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_new(&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_new(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_MIN / SEC_TO_NS);
return 0;
}