[Vm-dev] Camera sig fault on 64 bits machines.

[Eliot Miranda]

Hi Andreas, Hi Tty,


On Fri, Apr 11, 2014 at 7:54 AM, Andreas Wacknitz <a.wacknitz at gmx.de> wrote:

>
>
> Am 10.04.2014 um 22:49 schrieb Colin Putney <colin at wiresong.com>:
>
>
>
>
> On Thu, Apr 10, 2014 at 3:35 PM, gettimothy <gettimothy at zoho.com> wrote:
>
>
>> I have considered Open Solaris and FreeBSD for my former dos partition--I
>> don't know if CMake will work on them, but I will investigate. Do you have
>> a link for open solaris? When I checked a few days ago Oracle had branded
>> everything and I prefer to not deal with Ellison if I can.
>>
>
> I did some work a while back to build Cog on SmartOS and OpenIndiana. I
> got it to compile and run, but the image couldn't do IO or respond to UI
> events. I've found VirtualBox handy for this sort of thing--you can get
> ready-made images for many operating systems, which saves installing and
> configuring a bare-metal installation.
>
> So you got as far as I did. After some thoughts I guess the heart beat
> Eliot introduced for Cog might be a possible cause of the problem.
> When I did my first Solaris compilations of the Squeak VM a couple of
> years ago I had to adjust the signal handler installation. Solaris needs
> re-registration after a signal has been caught. I will take a look asap.
>

Noe that the itemer/signal based heartbeat should be viewed as the
heartbeat of last resort :-).  It has bad effects when integrating with
external code, interrupting system calls etc.  Unless this external code is
written to cope with interrupted calls that can't be restarted such as poll
or select, the heartbeat needs to be disabled around calls to the external
code.

Instead, the pthread/nanosleep based heartbeat (in
platforms/unix/vm/sqUnixHeartbeat.c) is benign but does require multiple
thread priorities in pthreads so that the heartbeat thread can run at a
higher priority than the VM thread and hence reliably interrupt it.

-- 
best,
Eliot
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