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This lock causes a deadlock when freeing the JACK client while a process callback is pending: deactivate_jack -> locks mutex JACK thread -> calls jack_process_callback jack_process_callback -> blocks on mutex jack_client_close -> joins JACK thread (deadlock as the process callback never returns) Instead, just don't lock the mutex. This is only mutexing on creation/destruction of the JACK client. This is not necessary: the process callback will only run after jack_activate (which is right before the mutex is released in jack_init()), and will stop running by the time jack_client_close returns. We don't actually need to unregister any ports, so just call jack_client_close first thing in deactivate_jack, which will guarantee the process callback has completed before returning. In fact, jack_process_callback isn't allowed to lock any mutexes or allocate any memory at all, so this plug-in is still broken in this way as obs_source_output_audio does that. This can cause audio xruns, as realtime guarantees are violated. This is something that should be fixed in the future, but at least it's not a deadlock.
OBS Studio <https://obsproject.com> =================================== .. image:: https://dev.azure.com/obsjim/obsjim/_apis/build/status/obsproject.obs-studio?branchName=master :alt: OBS Studio Build Status - Azure Pipelines :target: https://dev.azure.com/obsjim/obsjim/_build/latest?definitionId=1&branchName=master .. image:: https://d322cqt584bo4o.cloudfront.net/obs-studio/localized.svg :alt: OBS Studio Translation Project Progress :target: https://crowdin.com/project/obs-studio .. image:: https://discordapp.com/api/guilds/348973006581923840/widget.png?style=shield :alt: OBS Studio Discord Server :target: https://obsproject.com/discord What is OBS Studio? ------------------- OBS Studio is software designed for capturing, compositing, encoding, recording, and streaming video content, efficiently. It's distributed under the GNU General Public License v2 (or any later version) - see the accompanying COPYING file for more details. Quick Links ----------- - Website: https://obsproject.com - Help/Documentation/Guides: https://github.com/obsproject/obs-studio/wiki - Forums: https://obsproject.com/forum/ - Build Instructions: https://github.com/obsproject/obs-studio/wiki/Install-Instructions - Developer/API Documentation: https://obsproject.com/docs - Donating/backing/sponsoring: https://obsproject.com/contribute - Bug Tracker: https://github.com/obsproject/obs-studio/issues Contributing ------------ - If you would like to help fund or sponsor the project, you can do so via `Patreon <https://www.patreon.com/obsproject>`_, `OpenCollective <https://opencollective.com/obsproject>`_, or `PayPal <https://www.paypal.me/obsproject>`_. See our `contribute page <https://obsproject.com/contribute>`_ for more information. - If you wish to contribute code to the project, please make sure to read the coding and commit guidelines: https://github.com/obsproject/obs-studio/blob/master/CONTRIBUTING.rst - Developer/API documentation can be found here: https://obsproject.com/docs - If you wish to contribute translations, do not submit pull requests. Instead, please use Crowdin. For more information read this thread: https://obsproject.com/forum/threads/how-to-contribute-translations-for-obs.16327/ - Other ways to contribute are by helping people out with support on our forums or in our community chat. Please limit support to topics you fully understand -- bad advice is worse than no advice. When it comes to something that you don't fully know or understand, please defer to the official help or official channels.