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-rw-r--r--libs/backends/coreaudio/coreaudio_backend.cc48
-rw-r--r--libs/backends/coreaudio/coreaudio_backend.h1
2 files changed, 44 insertions, 5 deletions
diff --git a/libs/backends/coreaudio/coreaudio_backend.cc b/libs/backends/coreaudio/coreaudio_backend.cc
index 7137b1d65a..b488091632 100644
--- a/libs/backends/coreaudio/coreaudio_backend.cc
+++ b/libs/backends/coreaudio/coreaudio_backend.cc
@@ -21,6 +21,9 @@
#include <sys/mman.h>
#include <sys/time.h>
+#include <mach/thread_policy.h>
+#include <mach/thread_act.h>
+
#include <glibmm.h>
#include "coreaudio_backend.h"
@@ -327,6 +330,12 @@ CoreAudioBackend::set_buffer_size (uint32_t bs)
}
_samples_per_period = bs;
_pcmio->set_samples_per_period(bs);
+ if (_run) {
+ coreaudio_set_realtime_policy (_main_thread);
+ }
+ for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i) {
+ coreaudio_set_realtime_policy (*i);
+ }
engine.buffer_size_change (bs);
return 0;
}
@@ -603,11 +612,6 @@ CoreAudioBackend::_start (bool for_latency_measurement)
PBD::info << _("CoreAudioBackend: adjusted input channel count to match device.") << endmsg;
}
- if (_pcmio->samples_per_period() != _samples_per_period) {
- _samples_per_period = _pcmio->samples_per_period();
- PBD::warning << _("CoreAudioBackend: samples per period does not match.") << endmsg;
- }
-
if (_pcmio->sample_rate() != _samplerate) {
_samplerate = _pcmio->sample_rate();
engine.sample_rate_change (_samplerate);
@@ -816,6 +820,34 @@ CoreAudioBackend::coreaudio_process_thread (void *arg)
return 0;
}
+bool
+CoreAudioBackend::coreaudio_set_realtime_policy (pthread_t thread_id) const
+{
+ thread_time_constraint_policy_data_t policy;
+#ifndef NDEBUG
+ mach_msg_type_number_t msgt = 4;
+ boolean_t dflt = false;
+ kern_return_t rv = thread_policy_get (pthread_mach_thread_np (_main_thread),
+ THREAD_TIME_CONSTRAINT_POLICY, (thread_policy_t) &policy,
+ &msgt, &dflt);
+ printf ("Coreaudio Main Thread(%p) %d %d %d %d DFLT %d OK: %d\n", _main_thread, policy.period, policy.computation, policy.constraint, policy.preemptible, dflt, rv == KERN_SUCCESS);
+#endif
+
+ double period_ns = 1e9 * _samples_per_period / _samplerate;
+ policy.period = AudioConvertNanosToHostTime (period_ns);
+ policy.computation = AudioConvertNanosToHostTime (period_ns * .9);
+ policy.constraint = AudioConvertNanosToHostTime (period_ns * .95);
+ policy.preemptible = true;
+ kern_return_t res = thread_policy_set (pthread_mach_thread_np (thread_id),
+ THREAD_TIME_CONSTRAINT_POLICY, (thread_policy_t) &policy,
+ THREAD_TIME_CONSTRAINT_POLICY_COUNT);
+
+#ifndef NDEBUG
+ printf ("Coreaudio Proc Thread(%p) %d %d %d %d OK: %d\n", thread_id, policy.period, policy.computation, policy.constraint, policy.preemptible, res == KERN_SUCCESS);
+#endif
+ return res != KERN_SUCCESS;
+}
+
int
CoreAudioBackend::create_process_thread (boost::function<void()> func)
{
@@ -838,6 +870,10 @@ CoreAudioBackend::create_process_thread (boost::function<void()> func)
pthread_attr_destroy (&attr);
}
+ if (coreaudio_set_realtime_policy (thread_id)) {
+ PBD::warning << _("AudioEngine: process thread failed to set mach realtime policy.") << endmsg;
+ }
+
_threads.push_back (thread_id);
return 0;
}
@@ -1673,6 +1709,7 @@ CoreAudioBackend::freewheel_thread ()
AudioEngine::thread_init_callback (this);
_midiio->set_enabled(false);
reset_midi_parsers ();
+ coreaudio_set_realtime_policy (_main_thread);
}
// process port updates first in every cycle.
@@ -1738,6 +1775,7 @@ CoreAudioBackend::process_callback (const uint32_t n_samples, const uint64_t hos
_reinit_thread_callback = false;
_main_thread = pthread_self();
AudioEngine::thread_init_callback (this);
+ coreaudio_set_realtime_policy (_main_thread);
}
if (pthread_mutex_trylock (&_process_callback_mutex)) {
diff --git a/libs/backends/coreaudio/coreaudio_backend.h b/libs/backends/coreaudio/coreaudio_backend.h
index 5211839a9c..03edf4f6ed 100644
--- a/libs/backends/coreaudio/coreaudio_backend.h
+++ b/libs/backends/coreaudio/coreaudio_backend.h
@@ -447,6 +447,7 @@ class CoreAudioBackend : public AudioBackend {
/* process threads */
static void* coreaudio_process_thread (void *);
+ bool coreaudio_set_realtime_policy (pthread_t) const;
std::vector<pthread_t> _threads;
struct ThreadData {