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

Andreas Wacknitz a.wacknitz at gmx.de
Tue Apr 22 15:09:06 UTC 2014

Hi Eliot,

Thanks again for your help.

Am 21.04.2014 um 22:56 schrieb Eliot Miranda <eliot.miranda at gmail.com>:

> Hi Andreas,
> On Sat, Apr 19, 2014 at 2:52 PM, Andreas Wacknitz <a.wacknitz at gmx.de> wrote:
> Hi Eliot,
> Today I was able to work on this problem again. Alas heartbeat_handler() in sqUnixTimerHeartbeat.c is not called automatically as it should be.
> Only if I trigger an external ALRM signal (by means of signal -ALRM <pid>) it’s being called. I wasn’t able to find out how the trigger for it is being
> set.
> Hmmm.  In sqUnixTimerHeartbeat.c::ioInitHeartbeat() there's a sigaction call that establishes heartbeat_handle as the handler for SIGALRM.  Perhaps on FreeBSD or OpenSolaris you need to rearm the signal handler on each delivery?  But perhaps there's a flag you can set in the sigaction that avoids having to do this.
No, when I trigger SIGALRM from the outside the image works (albeit very slow). First I emitted SIGALRM by means of kill -SIGALRM <pid> from the shell; later I wrote a simple C program to do that for me :)

> The only place I found a nanosleep() call was in block() in sqUnixMain.c.
> See the nanosleep in sqUnixHeartbeat.c::beatStateMachine.
Yeah, I don’t know how I could miss this. I will debug a little bit in order to find out why this doesn’t work as expected on OpenSolaris.
After the initial step through heartbeat, there won’t be any heartbeat_handler calls triggered from within the vm…

> BTW what does with ticker and without ticker mean in respect to the heartbeat?
> The Qwaq/Teleplace/Terf VM needs support for sound processing.  The ticker is the thread or call that provides cycles for sound processing.
> But look, if FreeBSD provides pthreads you should try and use sqUnixHeartbeat.c instead of sqUnixTimerHeartbeat.c.
I already did that yesterday. Alas it’s only working with superuser rights, otherwise I’ll get "pthread_setschedparam failed; consider using ITIMER_HEARTBEAT: Not owner“.
I will also investigate further here so maybe I will get this working.

> HTH,
> Eliot

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