programs/taskmgr/priority.c

   1 /*
   2  *  ReactOS Task Manager
   3  *
   4  *  priority.c
   5  *
   6  *  Copyright (C) 1999 - 2001  Brian Palmer  <brianp@reactos.org>
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #define WIN32_LEAN_AND_MEAN    /* Exclude rarely-used stuff from Windows headers */
  24 #include <windows.h>
  25 #include <commctrl.h>
  26 #include <stdlib.h>
  27 #include <malloc.h>
  28 #include <memory.h>
  29 #include <tchar.h>
  30 #include <stdio.h>
  31 #include <winnt.h>
  32
  33 #include "taskmgr.h"
  34 #include "perfdata.h"
  35
  36 static void DoSetPriority(DWORD priority)
  37 {
  38     LVITEM            lvitem;
  39     ULONG            Index;
  40     DWORD            dwProcessId;
  41     HANDLE            hProcess;
  42     TCHAR            strErrorText[260];
  43
  44     for (Index=0; Index<(ULONG)ListView_GetItemCount(hProcessPageListCtrl); Index++)
  45     {
  46         memset(&lvitem, 0, sizeof(LVITEM));
  47
  48         lvitem.mask = LVIF_STATE;
  49         lvitem.stateMask = LVIS_SELECTED;
  50         lvitem.iItem = Index;
  51
  52         SendMessage(hProcessPageListCtrl, LVM_GETITEM, 0, (LPARAM)&lvitem);
  53
  54         if (lvitem.state & LVIS_SELECTED)
  55             break;
  56     }
  57
  58     dwProcessId = PerfDataGetProcessId(Index);
  59
  60     if ((ListView_GetSelectedCount(hProcessPageListCtrl) != 1) || (dwProcessId == 0))
  61         return;
  62
  63     if (MessageBox(hMainWnd, _T("WARNING: Changing the priority class of this process may\ncause undesired results including system instability. Are you\nsure you want to change the priority class?"), _T("Task Manager Warning"), MB_YESNO|MB_ICONWARNING) != IDYES)
  64         return;
  65
  66     hProcess = OpenProcess(PROCESS_SET_INFORMATION, FALSE, dwProcessId);
  67
  68     if (!hProcess)
  69     {
  70         GetLastErrorText(strErrorText, 260);
  71         MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
  72         return;
  73     }
  74
  75     if (!SetPriorityClass(hProcess, priority))
  76     {
  77         GetLastErrorText(strErrorText, 260);
  78         MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
  79     }
  80
  81     CloseHandle(hProcess);
  82 }
  83
  84 void ProcessPage_OnSetPriorityRealTime(void)
  85 {
  86     DoSetPriority(REALTIME_PRIORITY_CLASS);
  87 }
  88
  89 void ProcessPage_OnSetPriorityHigh(void)
  90 {
  91     DoSetPriority(HIGH_PRIORITY_CLASS);
  92 }
  93
  94 void ProcessPage_OnSetPriorityAboveNormal(void)
  95 {
  96     DoSetPriority(ABOVE_NORMAL_PRIORITY_CLASS);
  97 }
  98
  99 void ProcessPage_OnSetPriorityNormal(void)
 100 {
 101     DoSetPriority(NORMAL_PRIORITY_CLASS);
 102 }
 103
 104 void ProcessPage_OnSetPriorityBelowNormal(void)
 105 {
 106     DoSetPriority(BELOW_NORMAL_PRIORITY_CLASS);
 107 }
 108
 109 void ProcessPage_OnSetPriorityLow(void)
 110 {
 111     DoSetPriority(IDLE_PRIORITY_CLASS);
 112 }