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time.time() now uses clock_gettime(CLOCK_REALTIME) if available

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clock_gettime(CLOCK_REALTIME) has a better resolution than gettimeofday().
time.time() falls back on gettimeofday() (and then on other functions) on
error.
This commit is contained in:
Victor Stinner 2012-03-28 02:54:15 +02:00
parent 74eb6c0e8b
commit ad95c2d25c
1 changed files with 11 additions and 0 deletions
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11
Modules/timemodule.c
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@ -1088,6 +1088,17 @@ static PyObject*
floattime(void)
{
_PyTime_timeval t;
#ifdef HAVE_CLOCK_GETTIME
struct timespec tp;
int ret;
/* _PyTime_gettimeofday() does not use clock_gettime()
because it would require to link Python to the rt (real-time)
library, at least on Linux */
ret = clock_gettime(CLOCK_REALTIME, &tp);
if (ret == 0)
return PyFloat_FromDouble(tp.tv_sec + tp.tv_nsec * 1e-9);
#endif
_PyTime_gettimeofday(&t);
return PyFloat_FromDouble((double)t.tv_sec + t.tv_usec * 1e-6);
}