-MidiModel::write_section_to (boost::shared_ptr<MidiSource> source, Evoral::MusicalTime begin_time, Evoral::MusicalTime end_time)
+MidiModel::write_section_to (boost::shared_ptr<MidiSource> source,
+ const Glib::Threads::Mutex::Lock& source_lock,
+ Evoral::MusicalTime begin_time,
+ Evoral::MusicalTime end_time)