[ovs-git] Open vSwitch: timeval: Use monotonic time in OVS Python timeval library. (master)

dev at openvswitch.org dev at openvswitch.org
Fri May 30 23:04:02 UTC 2014


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- Log -----------------------------------------------------------------
commit 8396f8070bb35006fcd14486296fb203646a8dfa
Diffs: http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=commitdiff;h=8396f8070bb35006fcd14486296fb203646a8dfa
Author: Ryan Wilson <wryan at nicira.com>
		
timeval: Use monotonic time in OVS Python timeval library.
		
Python's time.time() function uses the system wall clock. However,
if NTP resets the wall clock to be a time in the past, then this
causes any applications that poll block based on time, such as
ovs-xapi-sync, to poll block indefinitely since the time is
unexpectedly negative.

This patch fixes the issue by using time.monotonic() if Python's
version >= 3.3. Otherwise, the timeval module calls out to the
librt C shared library and uses the clock_gettime function with
CLOCK_MONOTONIC.

Note this is only enabled on Linux-based platforms. This has been
tested on Ubuntu 12.04 and Redhat 6.4.

Bug #1189434
Signed-off-by: Ryan Wilson <wryan at nicira.com>
Acked-by: Ethan Jackson <ethan at nicira.com>


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Summary of changes:
 python/ovs/timeval.py |   34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)


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