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Add API to set thread-priority (for ctrl-surfaces)

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This commit is contained in:
Robin Gareus 2017-08-05 00:54:34 +02:00
parent c125cd2647
commit 8374e23014
2 changed files with 34 additions and 0 deletions
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32
libs/pbd/base_ui.cc
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@ -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 (&param, 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, &param);
}
void
BaseUI::main_thread ()
{