While POSIX defines a single contiguous range of numbers that
determine a thread's priority. Win32 defines priority classes
and priority levels relative to these classes.
pthread maps those to -15 .. +15 with the top six ones
corresponding to REALTIME_PRIORITY_CLASS and max being
THREAD_PRIORITY_TIME_CRITICAL
Note that the PA backend can USE_MMCSS_THREAD_PRIORITIES
and PBD::MMCSS::set_thread_characteristics() directly for
the I/O threads.
RegionFactory::CheckNewRegion signal is emitted directly
after region-creation from RegionFactory::create().
At this point in time the region is not on any playlist.
This if fine for EditorSources, but the new RegionList design
only shows regions that are on the timeline.
CheckNewRegion() -> EditorRegions::add_region()
-> EditorRegions::regions_changed() ignores regions w/o playlist.
Later Playlist::add_region_internal() sets the playlist but
calls Region::clear_changes() to not send all individual changes.
So Region::RegionsPropertyChanged is not emitted either.
We need to notify the EditorRegions *after* setting the playlist.
The downside of this is that more signals than necessary are
emitted.
If the wrong device profile is selected (ex Xtouch One) but another device
is connected (Xtouch), it is possible to have a master fader on the
device, but not in the code. This would then cause a crash when the
master fader was touched.
This just protects from a wrong configuration.
If _size_menu was non-null, we just return it. Ergo, it was already null when we reached
this line, which makes calling delete on it completely pointless
This test was added because of confusion about when/where dynamically constructed menus
were constructed and deleted. This should be consistent now, and this additional check
(on top of _size_menu itself being null) should be unnecessary
