[Python-checkins] cpython: time.time() now uses clock_gettime(CLOCK_REALTIME) if available

Wed Mar 28 02:54:58 CEST 2012

http://hg.python.org/cpython/rev/e505ce0514ff
changeset: 75970:e505ce0514ff
user: Victor Stinner <victor.stinner at gmail.com>
date: Wed Mar 28 02:54:15 2012 +0200
summary:
 time.time() now uses clock_gettime(CLOCK_REALTIME) if available
clock_gettime(CLOCK_REALTIME) has a better resolution than gettimeofday().
time.time() falls back on gettimeofday() (and then on other functions) on
error.
files:
 Modules/timemodule.c | 11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/Modules/timemodule.c b/Modules/timemodule.c
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -1088,6 +1088,17 @@
 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);
 }
-- 
Repository URL: http://hg.python.org/cpython
