384 lines
9.7 KiB
C
384 lines
9.7 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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static int
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pygettimeofday(_PyTime_timeval *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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ULONGLONG microseconds;
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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: number of microseconds between
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the 1st january 1601 and the 1st january 1970 (369 years + 89 leap
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days). */
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microseconds = large.QuadPart / 10 - 11644473600000000;
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tp->tv_sec = microseconds / 1000000;
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tp->tv_usec = microseconds % 1000000;
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if (info) {
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DWORD timeAdjustment, timeIncrement;
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BOOL isTimeAdjustmentDisabled, ok;
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info->implementation = "GetSystemTimeAsFileTime()";
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info->monotonic = 0;
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ok = GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement,
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&isTimeAdjustmentDisabled);
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if (!ok) {
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PyErr_SetFromWindowsErr(0);
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return -1;
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}
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info->resolution = timeIncrement * 1e-7;
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info->adjustable = 1;
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}
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#else /* MS_WINDOWS */
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int err;
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#ifdef HAVE_CLOCK_GETTIME
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struct timespec ts;
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#endif
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assert(info == NULL || raise);
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#ifdef HAVE_CLOCK_GETTIME
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err = clock_gettime(CLOCK_REALTIME, &ts);
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if (err) {
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if (raise)
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PyErr_SetFromErrno(PyExc_OSError);
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return -1;
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}
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tp->tv_sec = ts.tv_sec;
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tp->tv_usec = ts.tv_nsec / 1000;
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if (info) {
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struct timespec res;
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info->implementation = "clock_gettime(CLOCK_REALTIME)";
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info->monotonic = 0;
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info->adjustable = 1;
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if (clock_getres(CLOCK_REALTIME, &res) == 0)
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info->resolution = res.tv_sec + res.tv_nsec * 1e-9;
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else
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info->resolution = 1e-9;
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}
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#else /* HAVE_CLOCK_GETTIME */
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/* test gettimeofday() */
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#ifdef GETTIMEOFDAY_NO_TZ
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err = gettimeofday(tp);
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#else
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err = gettimeofday(tp, (struct timezone *)NULL);
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#endif
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if (err) {
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if (raise)
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PyErr_SetFromErrno(PyExc_OSError);
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return -1;
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}
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if (info) {
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info->implementation = "gettimeofday()";
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info->resolution = 1e-6;
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info->monotonic = 0;
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info->adjustable = 1;
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}
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#endif /* !HAVE_CLOCK_GETTIME */
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#endif /* !MS_WINDOWS */
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assert(0 <= tp->tv_usec && tp->tv_usec < 1000 * 1000);
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return 0;
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}
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void
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_PyTime_gettimeofday(_PyTime_timeval *tp)
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{
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if (pygettimeofday(tp, NULL, 0) < 0) {
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/* cannot happen, _PyTime_Init() checks that pygettimeofday() works */
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assert(0);
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tp->tv_sec = 0;
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tp->tv_usec = 0;
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}
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}
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int
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_PyTime_gettimeofday_info(_PyTime_timeval *tp, _Py_clock_info_t *info)
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{
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return pygettimeofday(tp, info, 1);
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}
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static int
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pymonotonic(_PyTime_timeval *tp, _Py_clock_info_t *info, int raise)
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{
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#ifdef Py_DEBUG
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static _PyTime_timeval last = {0, -1};
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#endif
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#if defined(MS_WINDOWS)
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ULONGLONG result;
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assert(info == NULL || raise);
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result = GetTickCount64();
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tp->tv_sec = result / 1000;
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tp->tv_usec = (result % 1000) * 1000;
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if (info) {
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DWORD timeAdjustment, timeIncrement;
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BOOL isTimeAdjustmentDisabled, ok;
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info->implementation = "GetTickCount64()";
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info->monotonic = 1;
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ok = GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement,
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&isTimeAdjustmentDisabled);
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if (!ok) {
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PyErr_SetFromWindowsErr(0);
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return -1;
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}
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info->resolution = timeIncrement * 1e-7;
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info->adjustable = 0;
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}
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#elif defined(__APPLE__)
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static mach_timebase_info_data_t timebase;
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uint64_t time;
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if (timebase.denom == 0) {
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/* According to the Technical Q&A QA1398, mach_timebase_info() cannot
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fail: https://developer.apple.com/library/mac/#qa/qa1398/ */
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(void)mach_timebase_info(&timebase);
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}
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time = mach_absolute_time();
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/* nanoseconds => microseconds */
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time /= 1000;
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/* apply timebase factor */
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time *= timebase.numer;
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time /= timebase.denom;
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tp->tv_sec = time / (1000 * 1000);
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tp->tv_usec = time % (1000 * 1000);
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if (info) {
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info->implementation = "mach_absolute_time()";
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info->resolution = (double)timebase.numer / timebase.denom * 1e-9;
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info->monotonic = 1;
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info->adjustable = 0;
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}
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#else
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struct timespec ts;
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#ifdef CLOCK_HIGHRES
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const clockid_t clk_id = CLOCK_HIGHRES;
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const char *implementation = "clock_gettime(CLOCK_HIGHRES)";
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#else
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const clockid_t clk_id = CLOCK_MONOTONIC;
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const char *implementation = "clock_gettime(CLOCK_MONOTONIC)";
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#endif
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assert(info == NULL || raise);
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if (clock_gettime(clk_id, &ts) != 0) {
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if (raise) {
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PyErr_SetFromErrno(PyExc_OSError);
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return -1;
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}
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tp->tv_sec = 0;
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tp->tv_usec = 0;
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return -1;
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}
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if (info) {
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struct timespec res;
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info->monotonic = 1;
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info->implementation = implementation;
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info->adjustable = 0;
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if (clock_getres(clk_id, &res) != 0) {
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PyErr_SetFromErrno(PyExc_OSError);
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return -1;
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}
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info->resolution = res.tv_sec + res.tv_nsec * 1e-9;
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}
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tp->tv_sec = ts.tv_sec;
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tp->tv_usec = ts.tv_nsec / 1000;
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#endif
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assert(0 <= tp->tv_usec && tp->tv_usec < 1000 * 1000);
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#ifdef Py_DEBUG
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/* monotonic clock cannot go backward */
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assert(last.tv_usec == -1
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|| tp->tv_sec > last.tv_sec
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|| (tp->tv_sec == last.tv_sec && tp->tv_usec >= last.tv_usec));
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last = *tp;
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#endif
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return 0;
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}
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void
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_PyTime_monotonic(_PyTime_timeval *tp)
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{
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if (pymonotonic(tp, NULL, 0) < 0) {
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/* cannot happen, _PyTime_Init() checks that pymonotonic() works */
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assert(0);
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tp->tv_sec = 0;
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tp->tv_usec = 0;
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}
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}
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int
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_PyTime_monotonic_info(_PyTime_timeval *tp, _Py_clock_info_t *info)
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{
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return pymonotonic(tp, info, 1);
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}
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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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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 <= LONG_MAX);
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if (PyFloat_Check(obj)) {
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double d, intpart, err;
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/* volatile avoids unsafe optimization on float enabled by gcc -O3 */
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volatile double floatpart;
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d = PyFloat_AsDouble(obj);
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floatpart = modf(d, &intpart);
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if (floatpart < 0) {
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floatpart = 1.0 + floatpart;
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intpart -= 1.0;
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}
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floatpart *= denominator;
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if (round == _PyTime_ROUND_UP) {
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if (intpart >= 0) {
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floatpart = ceil(floatpart);
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if (floatpart >= denominator) {
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floatpart = 0.0;
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intpart += 1.0;
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}
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}
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else {
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floatpart = floor(floatpart);
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}
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}
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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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*numerator = (long)floatpart;
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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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*numerator = 0;
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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 d, intpart, err;
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d = PyFloat_AsDouble(obj);
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if (round == _PyTime_ROUND_UP) {
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if (d >= 0)
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d = ceil(d);
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else
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d = floor(d);
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}
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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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return _PyTime_ObjectToDenominator(obj, sec, nsec, 1e9, round);
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}
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int
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_PyTime_ObjectToTimeval(PyObject *obj, time_t *sec, long *usec,
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_PyTime_round_t round)
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{
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return _PyTime_ObjectToDenominator(obj, sec, usec, 1e6, round);
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}
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int
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_PyTime_Init(void)
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{
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_PyTime_timeval tv;
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/* ensure that the system clock works */
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if (_PyTime_gettimeofday_info(&tv, NULL) < 0)
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return -1;
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/* ensure that the operating system provides a monotonic clock */
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if (_PyTime_monotonic_info(&tv, NULL) < 0)
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return -1;
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return 0;
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}
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