hal/windows/WindowsProcessPriority.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "Hal.h"
   6 #include "HalLog.h"
   7
   8 #include <windows.h>
   9
  10 using namespace mozilla::hal;
  11
  12 namespace mozilla {
  13 namespace hal_impl {
  14
  15 void SetProcessPriority(int aPid, ProcessPriority aPriority) {
  16   HAL_LOG("WindowsProcessPriority - SetProcessPriority(%d, %s)\n", aPid,
  17           ProcessPriorityToString(aPriority));
  18
  19   nsAutoHandle processHandle(
  20       ::OpenProcess(PROCESS_SET_INFORMATION, FALSE, aPid));
  21   if (processHandle) {
  22     DWORD priority = NORMAL_PRIORITY_CLASS;
  23     if (aPriority == PROCESS_PRIORITY_BACKGROUND) {
  24       priority = IDLE_PRIORITY_CLASS;
  25     } else if (aPriority == PROCESS_PRIORITY_BACKGROUND_PERCEIVABLE) {
  26       priority = BELOW_NORMAL_PRIORITY_CLASS;
  27     }
  28
  29     if (::SetPriorityClass(processHandle, priority)) {
  30       HAL_LOG("WindowsProcessPriority - priority set to %d for pid %d\n",
  31               aPriority, aPid);
  32     }
  33   }
  34 }
  35
  36 }  // namespace hal_impl
  37 }  // namespace mozilla