hw/xwin/winmsgwindow.c

   1 /*
   2  * Copyright (C) Jon TURNEY 2011
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #ifdef HAVE_XWIN_CONFIG_H
  26 #include <xwin-config.h>
  27 #endif
  28
  29 #include "win.h"
  30
  31 /*
  32  * This is the messaging window, a hidden top-level window. We never do anything
  33  * with it, but other programs may send messages to it.
  34  */
  35
  36 /*
  37  * winMsgWindowProc - Window procedure for msg window
  38  */
  39
  40 static
  41 LRESULT CALLBACK
  42 winMsgWindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
  43 {
  44 #if ENABLE_DEBUG
  45     winDebugWin32Message("winMsgWindowProc", hwnd, message, wParam, lParam);
  46 #endif
  47
  48     switch (message) {
  49     case WM_ENDSESSION:
  50         if (!wParam)
  51             return 0;           /* shutdown is being cancelled */
  52
  53         /*
  54            Send a WM_GIVEUP message to the X server thread so it wakes up if
  55            blocked in select(), performs GiveUp(), and then notices that GiveUp()
  56            has set the DE_TERMINATE flag so exits the msg dispatch loop.
  57          */
  58         {
  59             ScreenPtr pScreen = screenInfo.screens[0];
  60
  61             winScreenPriv(pScreen);
  62             PostMessage(pScreenPriv->hwndScreen, WM_GIVEUP, 0, 0);
  63         }
  64
  65         /*
  66            This process will be terminated by the system almost immediately
  67            after the last thread with a message queue returns from processing
  68            WM_ENDSESSION, so we cannot rely on any code executing after this
  69            message is processed and need to wait here until ddxGiveUp() is called
  70            and releases the termination mutex to guarantee that the lock file and
  71            unix domain sockets have been removed
  72
  73            ofc, Microsoft doesn't document this under WM_ENDSESSION, you are supposed
  74            to read the source of CRSS to find out how it works :-)
  75
  76            http://blogs.msdn.com/b/michen/archive/2008/04/04/application-termination-when-user-logs-off.aspx
  77          */
  78         {
  79             int iReturn = pthread_mutex_lock(&g_pmTerminating);
  80
  81             if (iReturn != 0) {
  82                 ErrorF("winMsgWindowProc - pthread_mutex_lock () failed: %d\n",
  83                        iReturn);
  84             }
  85             winDebug
  86                 ("winMsgWindowProc - WM_ENDSESSION termination lock acquired\n");
  87         }
  88
  89         return 0;
  90     }
  91
  92     return DefWindowProc(hwnd, message, wParam, lParam);
  93 }
  94
  95 static HWND
  96 winCreateMsgWindow(void)
  97 {
  98     HWND hwndMsg;
  99
 100     // register window class
 101     {
 102         WNDCLASSEX wcx;
 103
 104         wcx.cbSize = sizeof(WNDCLASSEX);
 105         wcx.style = CS_HREDRAW | CS_VREDRAW;
 106         wcx.lpfnWndProc = winMsgWindowProc;
 107         wcx.cbClsExtra = 0;
 108         wcx.cbWndExtra = 0;
 109         wcx.hInstance = g_hInstance;
 110         wcx.hIcon = NULL;
 111         wcx.hCursor = 0;
 112         wcx.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
 113         wcx.lpszMenuName = NULL;
 114         wcx.lpszClassName = WINDOW_CLASS_X_MSG;
 115         wcx.hIconSm = NULL;
 116         RegisterClassEx(&wcx);
 117     }
 118
 119     // Create the msg window.
 120     hwndMsg = CreateWindowEx(0, // no extended styles
 121                              WINDOW_CLASS_X_MSG,        // class name
 122                              "XWin Msg Window", // window name
 123                              WS_OVERLAPPEDWINDOW,       // overlapped window
 124                              CW_USEDEFAULT,     // default horizontal position
 125                              CW_USEDEFAULT,     // default vertical position
 126                              CW_USEDEFAULT,     // default width
 127                              CW_USEDEFAULT,     // default height
 128                              (HWND) NULL,       // no parent or owner window
 129                              (HMENU) NULL,      // class menu used
 130                              GetModuleHandle(NULL),     // instance handle
 131                              NULL);     // no window creation data
 132
 133     if (!hwndMsg) {
 134         ErrorF("winCreateMsgWindow - Create msg window failed\n");
 135         return NULL;
 136     }
 137
 138     winDebug("winCreateMsgWindow - Created msg window hwnd 0x%p\n", hwndMsg);
 139
 140     return hwndMsg;
 141 }
 142
 143 static void *
 144 winMsgWindowThreadProc(void *arg)
 145 {
 146     HWND hwndMsg;
 147
 148     winDebug("winMsgWindowThreadProc - Hello\n");
 149
 150     hwndMsg = winCreateMsgWindow();
 151     if (hwndMsg) {
 152         MSG msg;
 153
 154         /* Pump the msg window message queue */
 155         while (GetMessage(&msg, hwndMsg, 0, 0) > 0) {
 156 #if ENABLE_DEBUG
 157             winDebugWin32Message("winMsgWindowThread", msg.hwnd, msg.message,
 158                                  msg.wParam, msg.lParam);
 159 #endif
 160             DispatchMessage(&msg);
 161         }
 162     }
 163
 164     winDebug("winMsgWindowThreadProc - Exit\n");
 165
 166     return NULL;
 167 }
 168
 169 Bool
 170 winCreateMsgWindowThread(void)
 171 {
 172     pthread_t ptMsgWindowThreadProc;
 173
 174     /* Spawn a thread for the msg window  */
 175     if (pthread_create(&ptMsgWindowThreadProc,
 176                        NULL, winMsgWindowThreadProc, NULL)) {
 177         /* Bail if thread creation failed */
 178         ErrorF("winCreateMsgWindow - pthread_create failed.\n");
 179         return FALSE;
 180     }
 181
 182     return TRUE;
 183 }