Robin Gareus f8b5424d9f Fix deadlock during export
When using the export-tool, the very first callback may already be
freewheeling. In this case the first call to the butler also happens
directly from the freewheel process-callback and initial session events
are handled there. Setting PostTransportAdjustPlaybackBuffering
took the process-lock, which caused a deadlock:


Glib::Threads::Mutex::Lock::Lock(Glib::Threads::Mutex&) at /usr/include/glibmm-2.4/glibmm/threads.h:687
ARDOUR::Session::butler_transport_work() at ../libs/ardour/session_transport.cc:1157
ARDOUR::Session::process_export_fw(unsigned int) at ../libs/ardour/session_export.cc:303
ARDOUR::AudioEngine::process_callback(unsigned int) at ../libs/ardour/audioengine.cc:486
ARDOUR::DummyAudioBackend::main_process_thread() at ../libs/backends/dummy/dummy_audiobackend.cc:951
2020-12-08 01:09:57 +01:00
2020-12-08 01:09:57 +01:00
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2020-10-18 17:45:32 +02:00
2020-07-06 21:36:12 +02:00
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2020-01-25 04:07:41 +01:00
2020-12-02 01:04:25 +01:00

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