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Issue #22287: On UNIX, _PyTime_gettimeofday() now uses

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clock_gettime(CLOCK_REALTIME) if available. As a side effect, Python now
depends on the librt library on Solaris and on Linux (only with glibc older
than 2.17).
This commit is contained in:
Victor Stinner 2014-08-29 15:41:08 +02:00
parent 0dc10e0d1c
commit 7efb83393c
5 changed files with 48 additions and 35 deletions
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54
Python/pytime.c
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@ -56,8 +56,39 @@ pygettimeofday(_PyTime_timeval *tp, _Py_clock_info_t *info)
fail, so we fall back on ftime() or time().
Note: clock resolution does not imply clock accuracy! */
#ifdef HAVE_GETTIMEOFDAY
#if (defined(HAVE_CLOCK_GETTIME) || defined(HAVE_GETTIMEOFDAY) \
|| defined(HAVE_FTIME))
int err;
#endif
#ifdef HAVE_CLOCK_GETTIME
struct timespec ts;
#endif
#ifdef HAVE_FTIME
struct timeb t;
#endif
/* test clock_gettime(CLOCK_REALTIME) */
#ifdef HAVE_CLOCK_GETTIME
err = clock_gettime(CLOCK_REALTIME, &ts);
if (err == 0) {
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;
}
tp->tv_sec = ts.tv_sec;
tp->tv_usec = ts.tv_nsec / 1000;
return;
}
#endif
/* test gettimeofday() */
#ifdef HAVE_GETTIMEOFDAY
#ifdef GETTIMEOFDAY_NO_TZ
err = gettimeofday(tp);
#else
@ -74,18 +105,15 @@ pygettimeofday(_PyTime_timeval *tp, _Py_clock_info_t *info)
}
#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;
}
#ifdef HAVE_FTIME
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);