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Use MMCSS to elevate the thread priorities for audio and MIDI threads

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use AVRT_PRIORITY_NORMAL for audio threads and AVRT_PRIORITY_HIGH for MIDI
threads
This commit is contained in:
Tim Mayberry 2015-07-30 12:09:43 +10:00
parent e9d00f5cfb
commit acd17a9b53
4 changed files with 78 additions and 1 deletions
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38
libs/backends/portaudio/portaudio_backend.cc
View file

@ -37,6 +37,8 @@
#include "i18n.h"
#include "win_utils.h"
#include "mmcss.h"
#include "debug.h"
using namespace ARDOUR;
@ -79,6 +81,8 @@ PortAudioBackend::PortAudioBackend (AudioEngine& e, AudioBackendInfo& info)
_instance_name = s_instance_name;
pthread_mutex_init (&_port_callback_mutex, 0);
mmcss::initialize ();
_pcmio = new PortAudioIO ();
_midiio = new WinMMEMidiIO ();
}
@ -87,6 +91,9 @@ PortAudioBackend::~PortAudioBackend ()
{
delete _pcmio; _pcmio = 0;
delete _midiio; _midiio = 0;
mmcss::deinitialize ();
pthread_mutex_destroy (&_port_callback_mutex);
}
@ -636,7 +643,23 @@ PortAudioBackend::portaudio_process_thread (void *arg)
ThreadData* td = reinterpret_cast<ThreadData*> (arg);
boost::function<void ()> f = td->f;
delete td;
#ifdef USE_MMCSS_THREAD_PRIORITIES
HANDLE task_handle;
mmcss::set_thread_characteristics ("Pro Audio", &task_handle);
mmcss::set_thread_priority (task_handle, mmcss::AVRT_PRIORITY_NORMAL);
#endif
DWORD tid = GetThreadId (GetCurrentThread ());
DEBUG_THREADS (string_compose ("Process Thread Child ID: %1\n", tid));
f ();
#ifdef USE_MMCSS_THREAD_PRIORITIES
mmcss::revert_thread_characteristics (task_handle);
#endif
return 0;
}
@ -1308,6 +1331,16 @@ PortAudioBackend::main_process_thread ()
engine.halted_callback("PortAudio I/O error.");
}
#ifdef USE_MMCSS_THREAD_PRIORITIES
HANDLE task_handle;
mmcss::set_thread_characteristics ("Pro Audio", &task_handle);
mmcss::set_thread_priority (task_handle, mmcss::AVRT_PRIORITY_NORMAL);
#endif
DWORD tid = GetThreadId (GetCurrentThread ());
DEBUG_THREADS (string_compose ("Process Thread Master ID: %1\n", tid));
while (_run) {
if (_freewheeling != _freewheel) {
@ -1511,6 +1544,11 @@ PortAudioBackend::main_process_thread ()
if (_run) {
engine.halted_callback("PortAudio I/O error.");
}
#ifdef USE_MMCSS_THREAD_PRIORITIES
mmcss::revert_thread_characteristics (task_handle);
#endif
return 0;
}