4949f9a0b3f64a7a37fb6f45aa1cc5ade8542d0a
When I/O port-counts do not change, plugin re-order happens in sync in the process-thread. ::configure_io() is only called to ensure that the current configuration is valid. In case that the ChanCount does not change, the method must be realtime-safe and not block. DiskWriter::reset_write_sources() is not realtime-safe and implicitly causes a session-save: Write-sources are destroyed and re-created. This includes a call to write_source->drop_references(), which triggers ARDOUR::Session::remove_source(), which saves the session. Furthermore adding/removing plugins will likewise call ::configure_io(). Previously any processor change on a track lead to saving the session!
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html
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