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Re: [FFADO-devel] Iterating the FFADO iso handlers on Juju
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From: <ad...@dr...> - 2008-12-12 00:21:48
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On Thu, Dec 11, 2008 at 02:21:07PM +0100, Stefan Richter wrote:
> > adi@chopin:~$ grep "^open" juju-strace | grep 24
> > open("/dev", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 24
> > open("/dev", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 24
> This is either scan_devices()'s and fw_set_port()'s dir or
> fw_new_handle's inotify_fd.
First: I was wrong, the lines above do not correspond to what's going
on.
It's more like this:
[jackd start]
adi@libraw1394: epoll_fd is 8
adi@libraw1394: inotify_fd is 11
adi@libraw1394: epoll_fd is 8
adi@libraw1394: inotify_fd is 11
adi@libraw1394: epoll_fd is 8
adi@libraw1394: inotify_fd is 11
adi@libraw1394: opened /dev/fw1 as fd 13
adi@libraw1394: opened /dev/fw0 as fd 14
adi@libraw1394: local_fd is 14
adi: m_handle is at fd 8
The last line is from libffado (Ieee1394Service::initialize). Next:
adi@libraw1394: epoll_fd is 12
adi@libraw1394: inotify_fd is 17
adi@libraw1394: opened /dev/fw1 as fd 19
adi@libraw1394: opened /dev/fw0 as fd 20
adi@libraw1394: local_fd is 20
adi@libraw1394: epoll_fd is 18
adi@libraw1394: inotify_fd is 23
adi@libraw1394: opened /dev/fw1 as fd 25
adi@libraw1394: opened /dev/fw0 as fd 26
adi@libraw1394: local_fd is 26
adi@libraw1394: epoll_fd is 24
adi@libraw1394: inotify_fd is 29
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi: calling loop-iterate for fd 12
adi@libraw1394: waiting for epoll_fd 12
adi@libraw1394: waiting for epoll_fd 8
Nothing special, except the "waiting for epoll_fd 8". It's inside
fw_loop_iterate, just before epoll_wait. ffado then calls
raw1394_loop_iterate for fd 12, which results in fw_loop_iterate
epoll_waiting for fd 12. (this is Ieee1394Service::rHThread() in ffado's
libieee1394service.cpp)
Then, approx. 60 times "waiting for epoll_fd 8" from libraw1394. I've
neglected them.
adi@libraw1394: epoll_fd is 24
adi@libraw1394: inotify_fd is 29
adi@libraw1394: opened /dev/fw1 as fd 31
adi@libraw1394: opened /dev/fw0 as fd 32
adi@libraw1394: local_fd is 32
adi: our main iso fd is 24
got write request, offset=0xffffe0000000, length=4
adi: calling loop-iterate for fd 12
adi@libraw1394: waiting for epoll_fd 12
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: epoll_fd is 30
adi@libraw1394: inotify_fd is 35
adi@libraw1394: opened /dev/fw1 as fd 37
adi@libraw1394: opened /dev/fw0 as fd 38
adi@libraw1394: local_fd is 38
adi: our main iso fd is 30
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: epoll_fd is 36
adi@libraw1394: inotify_fd is 41
adi@libraw1394: opened /dev/fw1 as fd 43
adi@libraw1394: opened /dev/fw0 as fd 44
adi@libraw1394: local_fd is 44
adi: our main iso fd is 36
adi@libraw1394: waiting for epoll_fd 8
The "our main iso fd" is from IsoHandler::init(), right after m_handle.
It's simply raw1394_new_handle_on_port and raw1394_get_fd afterwards.
Note that we've seen fd 24, 30 and 36 as the main iso fds.
[some lines waiting for epoll_fd 8]
adi: assigned ISO channel 0
adi@libraw1394: waiting for epoll_fd 8 (multiple times)
adi: assigned ISO channel 1
adi@libraw1394: waiting for epoll_fd 8 (multiple times)
adi: assigned ISO channel 2
adi@libraw1394: waiting for epoll_fd 8 (multiple times)
(we just saw iso channel allocation, nothing special here)
adi@libraw1394: opened /dev/fw0 as iso fd 45
adi@libraw1394: added fd 45 to epoll_fd 36
adi: added fd 36 to shadowMap
adi@libraw1394: opened /dev/fw0 as iso fd 46
adi@libraw1394: added fd 46 to epoll_fd 24
adi: added fd 24 to shadowMap
adi@libraw1394: opened /dev/fw0 as iso fd 47
adi@libraw1394: added fd 47 to epoll_fd 30
adi: added fd 24 to shadowMap
adi: added fd 30 to shadowMap
Looks good to me: adding the ISO fds to the epoll_fd and then adding the
epoll_fds to ffado's shadowMap for poll().
adi@libraw1394: waiting for epoll_fd 8 (many more)
firewire ERR: Could not start streaming threads: -1
DRIVER NT: could not start driver
cannot start driver
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
firewire ERR: Could not stop streaming threads
DRIVER NT: error stopping driver
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi@libraw1394: waiting for epoll_fd 8
adi: added fd 36 to shadowMap
adi: added fd 30 to shadowMap
adi: added fd 36 to shadowMap
no message buffer overruns
[END]
During the last hours, I've never seen an event in ffado. poll returns,
but the revents are always 0, so no iteration starts.
Cheerio
--
mail: ad...@th... http://adi.thur.de PGP/GPG: key via keyserver
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