Add MMCSS related code for raising thread priority on Windows
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libs/backends/portaudio/mmcss.cc
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161
libs/backends/portaudio/mmcss.cc
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/*
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* Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "mmcss.h"
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#include "pbd/compose.h"
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#include "debug.h"
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typedef HANDLE (WINAPI* AvSetMmThreadCharacteristicsA_t)(LPCSTR TaskName,
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LPDWORD TaskIndex);
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typedef WINBOOL (WINAPI* AvRevertMmThreadCharacteristics_t)(HANDLE AvrtHandle);
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typedef WINBOOL (WINAPI* AvSetMmThreadPriority_t)(
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HANDLE AvrtHandle, mmcss::AVRT_PRIORITY Priority);
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static HMODULE avrt_dll = NULL;
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static AvSetMmThreadCharacteristicsA_t AvSetMmThreadCharacteristicsA = NULL;
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static AvRevertMmThreadCharacteristics_t AvRevertMmThreadCharacteristics = NULL;
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static AvSetMmThreadPriority_t AvSetMmThreadPriority = NULL;
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namespace mmcss {
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bool
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initialize ()
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{
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if (avrt_dll != NULL) return true;
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avrt_dll = LoadLibraryA ("avrt.dll");
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if (avrt_dll == NULL) {
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DEBUG_THREADS ("Unable to load avrt.dll\n");
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return false;
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}
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bool unload_dll = false;
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AvSetMmThreadCharacteristicsA =
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(AvSetMmThreadCharacteristicsA_t)GetProcAddress (
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avrt_dll, "AvSetMmThreadCharacteristicsA");
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if (AvSetMmThreadCharacteristicsA == NULL) {
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DEBUG_THREADS ("Unable to resolve AvSetMmThreadCharacteristicsA\n");
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unload_dll = true;
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}
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AvRevertMmThreadCharacteristics =
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(AvRevertMmThreadCharacteristics_t)GetProcAddress (
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avrt_dll, "AvRevertMmThreadCharacteristics");
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if (AvRevertMmThreadCharacteristics == NULL) {
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DEBUG_THREADS ("Unable to resolve AvRevertMmThreadCharacteristics\n");
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unload_dll = true;
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}
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AvSetMmThreadPriority = (AvSetMmThreadPriority_t)GetProcAddress (
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avrt_dll, "AvSetMmThreadPriority");
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if (AvSetMmThreadPriority == NULL) {
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DEBUG_THREADS ("Unable to resolve AvSetMmThreadPriority\n");
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unload_dll = true;
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}
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if (unload_dll) {
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DEBUG_THREADS (
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"MMCSS Unable to resolve necessary symbols, unloading avrt.dll\n");
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deinitialize ();
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}
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return true;
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}
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bool
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deinitialize ()
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{
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if (avrt_dll == NULL) return true;
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if (FreeLibrary (avrt_dll) == 0) {
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DEBUG_THREADS ("Unable to unload avrt.dll\n");
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return false;
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}
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avrt_dll = NULL;
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AvSetMmThreadCharacteristicsA = NULL;
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AvRevertMmThreadCharacteristics = NULL;
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AvSetMmThreadPriority = NULL;
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return true;
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}
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bool
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set_thread_characteristics (const std::string& task_name, HANDLE* task_handle)
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{
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if (AvSetMmThreadCharacteristicsA == NULL) return false;
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DWORD task_index_dummy = 0;
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*task_handle = AvSetMmThreadCharacteristicsA(task_name.c_str(), &task_index_dummy);
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if (*task_handle == 0) {
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DEBUG_THREADS (string_compose ("Failed to set Thread Characteristics to %1\n",
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task_name));
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return false;
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}
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DEBUG_THREADS (
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string_compose ("Set thread characteristics to %1\n", task_name));
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return true;
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}
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bool
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revert_thread_characteristics (HANDLE task_handle)
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{
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if (AvRevertMmThreadCharacteristics == NULL) return false;
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if (AvRevertMmThreadCharacteristics (task_handle) == 0) {
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DEBUG_THREADS ("Failed to set revert thread characteristics\n");
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return false;
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}
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DEBUG_THREADS ("Reverted thread characteristics\n");
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return true;
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}
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bool
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set_thread_priority (HANDLE task_handle, AVRT_PRIORITY priority)
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{
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if (AvSetMmThreadPriority == NULL) return false;
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if (AvSetMmThreadPriority (task_handle, priority) == 0) {
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DEBUG_THREADS (
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string_compose ("Failed to set thread priority %1\n", priority));
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return false;
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}
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DEBUG_THREADS (string_compose ("Set thread priority to %1\n", priority));
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return true;
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}
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} // namespace mmcss
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49
libs/backends/portaudio/mmcss.h
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49
libs/backends/portaudio/mmcss.h
Normal file
@ -0,0 +1,49 @@
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/*
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* Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef MMCSS_H
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#define MMCSS_H
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#include <windows.h>
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#include <string>
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namespace mmcss {
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enum AVRT_PRIORITY {
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AVRT_PRIORITY_VERYLOW = -2,
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AVRT_PRIORITY_LOW,
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AVRT_PRIORITY_NORMAL,
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AVRT_PRIORITY_HIGH,
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AVRT_PRIORITY_CRITICAL
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};
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bool initialize ();
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bool deinitialize ();
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bool set_thread_characteristics (const std::string& task_name, HANDLE *task_handle);
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bool revert_thread_characteristics (HANDLE task_handle);
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bool set_thread_priority (HANDLE, AVRT_PRIORITY);
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} // namespace mmcss
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#endif // MMCSS_H
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@ -26,7 +26,8 @@ def build(bld):
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'winmmemidi_input_device.cc',
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'winmmemidi_output_device.cc',
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'win_utils.cc',
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'midi_util.cc'
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'midi_util.cc',
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'mmcss.cc'
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]
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obj.includes = ['.']
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obj.name = 'portaudio_backend'
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