Set Automationwatch thread priority (needs to be higher than GUI)

This fixes an issue with sparse automation touch/write when the CPU is
busy (stationary playhead, waveform rendering, or just high DSP load)

diff --git a/libs/ardour/automation_watch.cc b/libs/ardour/automation_watch.cc
index a7a7a36eedd4f6e61e8e5d69e355ad906a79711d..c949509d091e88348cdf8bdb8801fec4e33214f3 100644 (file)
--- a/libs/ardour/automation_watch.cc
+++ b/libs/ardour/automation_watch.cc
@@ -22,6 +22,7 @@
 #include <glibmm/timer.h>
 
 #include "pbd/compose.h"
+#include "pbd/pthread_utils.h"
 
 #include "ardour/automation_control.h"
 #include "ardour/automation_watch.h"
@@ -185,6 +186,7 @@ AutomationWatch::timer ()
 void
 AutomationWatch::thread ()
 {
+       pbd_set_thread_priority (pthread_self(), SCHED_FIFO, -25);
        while (_run_thread) {
                Glib::usleep ((gulong) floor (Config->get_automation_interval_msecs() * 1000));
                timer ();