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/*
* Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "pbd/windows_mmcss.h"
#include "pbd/compose.h"
#include "pbd/debug.h"
#define DEBUG_THREADS(msg) DEBUG_TRACE (PBD::DEBUG::Threads, msg);
typedef HANDLE (WINAPI* AvSetMmThreadCharacteristicsA_t)(LPCSTR TaskName,
LPDWORD TaskIndex);
typedef BOOL (WINAPI* AvRevertMmThreadCharacteristics_t)(HANDLE AvrtHandle);
typedef BOOL (WINAPI* AvSetMmThreadPriority_t)(
HANDLE AvrtHandle, PBD::MMCSS::AVRT_PRIORITY Priority);
static HMODULE avrt_dll = NULL;
static AvSetMmThreadCharacteristicsA_t AvSetMmThreadCharacteristicsA = NULL;
static AvRevertMmThreadCharacteristics_t AvRevertMmThreadCharacteristics = NULL;
static AvSetMmThreadPriority_t AvSetMmThreadPriority = NULL;
namespace PBD {
namespace MMCSS {
bool
initialize ()
{
if (avrt_dll != NULL) return true;
avrt_dll = LoadLibraryA ("avrt.dll");
if (avrt_dll == NULL) {
DEBUG_THREADS ("Unable to load avrt.dll\n");
return false;
}
bool unload_dll = false;
AvSetMmThreadCharacteristicsA =
(AvSetMmThreadCharacteristicsA_t)GetProcAddress (
avrt_dll, "AvSetMmThreadCharacteristicsA");
if (AvSetMmThreadCharacteristicsA == NULL) {
DEBUG_THREADS ("Unable to resolve AvSetMmThreadCharacteristicsA\n");
unload_dll = true;
}
AvRevertMmThreadCharacteristics =
(AvRevertMmThreadCharacteristics_t)GetProcAddress (
avrt_dll, "AvRevertMmThreadCharacteristics");
if (AvRevertMmThreadCharacteristics == NULL) {
DEBUG_THREADS ("Unable to resolve AvRevertMmThreadCharacteristics\n");
unload_dll = true;
}
AvSetMmThreadPriority = (AvSetMmThreadPriority_t)GetProcAddress (
avrt_dll, "AvSetMmThreadPriority");
if (AvSetMmThreadPriority == NULL) {
DEBUG_THREADS ("Unable to resolve AvSetMmThreadPriority\n");
unload_dll = true;
}
if (unload_dll) {
DEBUG_THREADS (
"MMCSS Unable to resolve necessary symbols, unloading avrt.dll\n");
deinitialize ();
}
return true;
}
bool
deinitialize ()
{
if (avrt_dll == NULL) return true;
if (FreeLibrary (avrt_dll) == 0) {
DEBUG_THREADS ("Unable to unload avrt.dll\n");
return false;
}
avrt_dll = NULL;
AvSetMmThreadCharacteristicsA = NULL;
AvRevertMmThreadCharacteristics = NULL;
AvSetMmThreadPriority = NULL;
return true;
}
bool
set_thread_characteristics (const std::string& task_name, HANDLE* task_handle)
{
if (AvSetMmThreadCharacteristicsA == NULL) return false;
DWORD task_index_dummy = 0;
*task_handle = AvSetMmThreadCharacteristicsA(task_name.c_str(), &task_index_dummy);
if (*task_handle == 0) {
DEBUG_THREADS (string_compose ("Failed to set Thread Characteristics to %1\n",
task_name));
DWORD error = GetLastError();
switch (error) {
case ERROR_INVALID_TASK_INDEX:
DEBUG_THREADS("MMCSS: Invalid Task Index\n");
break;
case ERROR_INVALID_TASK_NAME:
DEBUG_THREADS("MMCSS: Invalid Task Name\n");
break;
case ERROR_PRIVILEGE_NOT_HELD:
DEBUG_THREADS("MMCSS: Privilege not held\n");
break;
default:
DEBUG_THREADS("MMCSS: Unknown error setting thread characteristics\n");
break;
}
return false;
}
DEBUG_THREADS (
string_compose ("Set thread characteristics to %1\n", task_name));
return true;
}
bool
revert_thread_characteristics (HANDLE task_handle)
{
if (AvRevertMmThreadCharacteristics == NULL) return false;
if (AvRevertMmThreadCharacteristics (task_handle) == 0) {
DEBUG_THREADS ("Failed to set revert thread characteristics\n");
return false;
}
DEBUG_THREADS ("Reverted thread characteristics\n");
return true;
}
bool
set_thread_priority (HANDLE task_handle, AVRT_PRIORITY priority)
{
if (AvSetMmThreadPriority == NULL) return false;
if (AvSetMmThreadPriority (task_handle, priority) == 0) {
DEBUG_THREADS (
string_compose ("Failed to set thread priority %1\n", priority));
return false;
}
DEBUG_THREADS (string_compose ("Set thread priority to %1\n", priority));
return true;
}
} // namespace MMCSS
} // namespace PBD
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