diff options
Diffstat (limited to 'libs/pbd/base_ui.cc')
| -rw-r--r-- | libs/pbd/base_ui.cc | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/libs/pbd/base_ui.cc b/libs/pbd/base_ui.cc index f22d83264e..b04b755ec8 100644 --- a/libs/pbd/base_ui.cc +++ b/libs/pbd/base_ui.cc @@ -28,6 +28,9 @@ #include <cerrno> #include <cstring> +#include <pthread.h> +#include <sched.h> + #include "pbd/base_ui.h" #include "pbd/debug.h" #include "pbd/pthread_utils.h" @@ -76,6 +79,35 @@ BaseUI::new_request_type () return rt; } +int +BaseUI::set_thread_priority (const int policy, int priority) const +{ + struct sched_param param; + memset (¶m, 0, sizeof (param)); + + /* POSIX requires a spread of at least 32 steps between min..max */ + const int p_min = sched_get_priority_min (policy); // Linux: 1 + const int p_max = sched_get_priority_max (policy); // Linux: 99 + + if (priority == 0) { + /* use default. XXX this should be relative to audio (JACK) thread, + * internal backends use -20 (Audio), -21 (MIDI), -22 (compuation) + */ + priority = 7; + } + + if (priority > 0) { + priority += p_min; + } else { + priority += p_max; + } + if (priority > p_max) priority = p_max; + if (priority < p_min) priority = p_min; + param.sched_priority = priority; + + return pthread_setschedparam (pthread_self(), SCHED_FIFO, ¶m); +} + void BaseUI::main_thread () { |