[PATCH] disable monotonic clock if condattr_setclock(CLOCK_MONOTONIC) does not work

[Gleb Natapov]

If pthread_condattr_setclock(CLOCK_MONOTONIC) fails monotonic clock
cannot be used since otherwise timeout for pthread_cond_timedwait()
is calculated incorrectly which causes it to exit immediately. Fix that
by disabling monotonic clock in case attribute setting fails.

diff -r a3dc98dc4d21 src/os/linux/vm/os_linux.cpp
--- a/src/os/linux/vm/os_linux.cpp	Wed Dec 04 23:11:03 2013 -0800
+++ b/src/os/linux/vm/os_linux.cpp	Thu Jan 16 15:19:58 2014 +0200
@@ -4762,6 +4762,7 @@
       if (status == EINVAL) {
         warning("Unable to use monotonic clock with relative timed-waits" \
                 " - changes to the time-of-day clock may have adverse affects");
+        Linux::_clock_gettime = NULL;
       } else {
         fatal(err_msg("pthread_condattr_setclock: %s", strerror(status)));
       }
--
			Gleb.