Re: [FFmpeg-devel] [PATCH WIP 0/9] Refactor DNN

["Guo, Yejun" <yejun.guo-at-intel.com@ffmpeg.org>]

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of Zhao
> Zhili
> Sent: Sunday, April 28, 2024 6:55 PM
> To: FFmpeg development discussions and patches <ffmpeg-
> devel@ffmpeg.org>
> Subject: Re: [FFmpeg-devel] [PATCH WIP 0/9] Refactor DNN
> 
> 
> 
> > On Apr 28, 2024, at 18:34, Guo, Yejun <yejun.guo-at-
> intel.com@ffmpeg.org> wrote:
> >
> >> -----Original Message-----
> >> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org
> >> <mailto:ffmpeg-devel-bounces@ffmpeg.org>> On Behalf Of Zhao Zhili
> >> Sent: Sunday, April 28, 2024 12:42 AM
> >> To: ffmpeg-devel@ffmpeg.org <mailto:ffmpeg-devel@ffmpeg.org>
> >> Cc: Zhao Zhili <zhilizhao@tencent.com <mailto:zhilizhao@tencent.com>>
> >> Subject: [FFmpeg-devel] [PATCH WIP 0/9] Refactor DNN
> >>
> >> From: Zhao Zhili <zhilizhao@tencent.com>
> >>
> >> During the refactor progress, I have found some serious issues, which
> >> is not resolved by the patchset:
> >>
> >> 1. Tensorflow backend is broken.
> >>
> >> I think it doesn't work since 2021 at least. For example, it destroy
> >> a thread and create a new thread for each frame, and it destroy an
> >> invalid thread at the first
> >> frame:
> >
> > It works from the day that code is merged, till today. It is by design
> > to keep the code simplicity by using the feature that pthread_join
> > accepts a parameter that is not a joinable thread.
> >
> > Please share more info if you experienced a real case that it does not work.
> 
> It will abort if ASSERT_LEVEL > 1.
> 
> #define ASSERT_PTHREAD_ABORT(func, ret) do {                            \
>     char errbuf[AV_ERROR_MAX_STRING_SIZE] = "";                         \
>     av_log(NULL, AV_LOG_FATAL, AV_STRINGIFY(func)                       \
>            " failed with error: %s\n",                                  \
>            av_make_error_string(errbuf, AV_ERROR_MAX_STRING_SIZE,       \
>                                 AVERROR(ret)));                         \
>     abort();                                                            \
> } while (0)
> 
> I think the check is there just to prevent call pthread_join(0, &ptr) by accident,
> so we shouldn’t do that on purpose.
> 
Nice catch with configure assert level > 1, will fix, and patch also welcome, thanks.
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