[Mono-dev] Timers using Linux monotonic clock not system time

Craig McQueen craig.mcqueen at innerrange.com
Wed Aug 17 06:53:03 UTC 2016

I've made a patch which applies for (which is the version I'm using with the meta-mono layer for Yocto).

I assume that for best results, I should apply it to the latest of some branch in the git repository. What branch(es) have active development, and are patches accepted for? I could apply it to the latest mono-4.4.0-branch, or some other?

From: Rodrigo Kumpera [mailto:kumpera at gmail.com] 
Sent: Wednesday, 17 August 2016 2:31 AM
To: Craig McQueen <craig.mcqueen at innerrange.com>
Cc: mono-devel-list at lists.dot.net
Subject: Re: [Mono-dev] Timers using Linux monotonic clock not system time

Yes, we'd consider such patches.

On Tue, Aug 16, 2016 at 12:06 AM, Craig McQueen <craig.mcqueen at innerrange.com> wrote:
I wrote:
> On an embedded Linux project, we found that Mono timers are disrupted by
> a system time change. If system time is set forwards, then timers fire too
> early. If system time is set backwards, then timers don't fire when they
> should. We found this is known bug #3025.
> https://bugzilla.xamarin.com/show_bug.cgi?id=3025
> So we're using the patch from that bug. But, can this patch please go into the
> main code? This bug seems to be a serious one as far as potential failure
> modes (yet hard to catch in testing because it is a corner-case), so an
> important one to fix.

I need to upgrade to Mono 4.4.0 to fix another issue I reported (SMTP with SSL/TLS and intermediate certificates). I see that Mono 4.4.0 is susceptible to timers failing when system time changes. But the patch I was using for Mono 4.2.1 doesn't apply for Mono 4.4.0. So I'll have to rework the patch.

I can provide an updated patch when I've figured it out. Would a patch be likely to be accepted for the mainline Mono code?

Craig McQueen

Mono-devel-list mailing list
Mono-devel-list at lists.dot.net

-------------- next part --------------
A non-text attachment was scrubbed...
Name: monotonic_timers.
Type: application/octet-stream
Size: 3166 bytes
Desc: monotonic_timers.
URL: <http://lists.dot.net/pipermail/mono-devel-list/attachments/20160817/2c494ae0/attachment.obj>

More information about the Mono-devel-list mailing list