As was noted in 88ee3af3ea it is unsafe/undefined behavior if two threads
sleep on the JACK request file descriptor, since there is no way to control
which one will wake and process the request. Since each thread may have
sent a different request, this can lead to a thread misinterpreting the
response because it is reading the wrong response.
This may (or may not) solve some subtle problems with JACK, but was
revealed by having a control surface (LaunchPad Pro) that registers
three ports from the butler thread at about the same as the GUI
thread is registering the auditioner. One thread read the wrong
response, and because of some slightly weird code/design, it attempts
to rename the port from within the response handler, which in JACK1
leads to deadlock (and later, zombification).
Without this, two threads can both sleep on the same communication channel, and the wake order
is non-determinate, so the wrong thread may process the response to the other thread's request.
See also 976e03c15c which does this for `route_list_to_control_list`.
Fix crashes with empty route-lists e.g. momentary solo which was
introduced in 03105aa760.
I do not understand why this works, but all of this code related to MIDNAM
model names is just a total mess in terms of rational design (caused, in turn,
by MIDNAM's design, which might possibly reflect the real world).
this defines how the grid interacts with other snap targets (ph, etc)
* Grid: we ignore other snap targets when the grid is enabled
* Both: we snap to both grid and other snap-targets when grid is enabled
* Other: we only snap to other snap-targets and ignore the grid, even
though the grid is enabled
This currently prints warnings for statically linked libs
here: zita-resampler global Resampler_table::_mutex
Both libardour and ALSA backend statically link against zita-resampler.
The suspend/resume routes code requires that there be a call to
Editor::redisplay_track_views() if anything is to happen on resume. This was
missing from the events triggered by a UI scale change.
