Initial revision

hw/xwin/winmultiwindowwm.c

@@ -0,0 +1,907 @@
+/*
+ *Copyright (C) 1994-2000 The XFree86 Project, Inc. All Rights Reserved.
+ *
+ *Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ *"Software"), to deal in the Software without restriction, including
+ *without limitation the rights to use, copy, modify, merge, publish,
+ *distribute, sublicense, and/or sell copies of the Software, and to
+ *permit persons to whom the Software is furnished to do so, subject to
+ *the following conditions:
+ *
+ *The above copyright notice and this permission notice shall be
+ *included in all copies or substantial portions of the Software.
+ *
+ *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *NONINFRINGEMENT. IN NO EVENT SHALL THE XFREE86 PROJECT BE LIABLE FOR
+ *ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+ *CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ *Except as contained in this notice, the name of the XFree86 Project
+ *shall not be used in advertising or otherwise to promote the sale, use
+ *or other dealings in this Software without prior written authorization
+ *from the XFree86 Project.
+ *
+ * Authors:	Kensuke Matsuzaki
+ */
+/* $XFree86: xc/programs/Xserver/hw/xwin/winmultiwindowwm.c,v 1.1 2003/02/12 15:01:38 alanh Exp $ */
+
+/* X headers */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/select.h>
+#include <fcntl.h>
+#include <setjmp.h>
+#include <pthread.h>
+#include <X11/X.h>
+#include <X11/Xatom.h>
+#include <X11/Xlib.h>
+#include <X11/Xlocale.h>
+#include <X11/Xproto.h>
+#include <X11/Xutil.h>
+
+/* Fixups to prevent collisions between Windows and X headers */
+#define ATOM DWORD
+
+/* Windows headers */
+#include <windows.h>
+
+/* Local headers */
+#include "winwindow.h"
+
+
+/*
+ * Constant defines
+ */
+
+#define WIN_CONNECT_RETRIES	5
+#define WIN_CONNECT_DELAY	5
+#define WIN_MSG_QUEUE_FNAME	"/dev/windows"
+#define	WM_WM_X_EVENT           1
+#define WIN_JMP_OKAY		0
+#define WIN_JMP_ERROR_IO	2
+
+
+/*
+ * Local structures
+ */
+
+typedef struct _WMMsgNodeRec {
+  winWMMessageRec	msg;
+  struct _WMMsgNodeRec	*pNext;
+} WMMsgNodeRec, *WMMsgNodePtr;
+
+typedef struct _WMMsgQueueRec {
+  struct _WMMsgNodeRec	*pHead;
+  struct _WMMsgNodeRec	*pTail;
+  pthread_mutex_t	pmMutex;
+  pthread_cond_t	pcNotEmpty;
+} WMMsgQueueRec, *WMMsgQueuePtr;
+
+typedef struct _WMInfo {
+  Display		*pDisplay;
+  WMMsgQueueRec		wmMsgQueue;
+  Atom			atmWmProtos;
+  Atom			atmWmDelete;
+} WMInfoRec, *WMInfoPtr;
+
+typedef struct _WMProcArgRec {
+  DWORD			dwScreen;
+  WMInfoPtr		pWMInfo;
+  pthread_mutex_t	*ppmServerStarted;
+} WMProcArgRec, *WMProcArgPtr;
+
+
+/*
+ * References to external symbols
+ */
+
+extern char *display;
+extern void ErrorF (const char* /*f*/, ...);
+extern Bool g_fCalledSetLocale;
+
+
+/*
+ * Prototypes for local functions
+ */
+
+static void
+PushMessage (WMMsgQueuePtr pQueue, WMMsgNodePtr pNode);
+
+static WMMsgNodePtr
+PopMessage (WMMsgQueuePtr pQueue);
+
+static Bool
+InitQueue (WMMsgQueuePtr pQueue);
+
+static void
+GetWindowName (Display * pDpy, Window iWin, char **ppName);
+
+static int
+SendXMessage (Display *pDisplay, Window iWin, Atom atmType, long nData);
+
+static void*
+winMultiWindowWMProc (void* pArg);
+
+static Bool
+FlushXEvents (WMInfoPtr pWMInfo);
+
+static int
+winMultiWindowWMErrorHandler (Display *pDisp, XErrorEvent *e);
+
+static void
+winInitMultiWindowWM (WMInfoPtr pWMInfo, WMProcArgPtr pProcArg);
+
+static int
+winMutliWindowWMIOErrorHandler (Display *pDisplay);
+
+
+/*
+ * Local globals
+ */
+
+static int			g_nQueueSize;
+static jmp_buf			g_jmpEntry;
+
+
+
+/*
+ * PushMessage - Push a message onto the queue
+ */
+
+static void
+PushMessage (WMMsgQueuePtr pQueue, WMMsgNodePtr pNode)
+{
+
+  /* Lock the queue mutex */
+  pthread_mutex_lock (&pQueue->pmMutex);
+
+  pNode->pNext = NULL;
+  
+  if (pQueue->pTail != NULL)
+    {
+      pQueue->pTail->pNext = pNode;
+    }
+  pQueue->pTail = pNode;
+  
+  if (pQueue->pHead == NULL)
+    {
+      pQueue->pHead = pNode;
+    }
+
+
+#if 0
+  switch (pNode->msg.msg)
+    {
+    case WM_WM_MOVE:
+      ErrorF ("\tWM_WM_MOVE\n");
+      break;
+    case WM_WM_RAISE:
+      ErrorF ("\tWM_WM_RAISE\n");
+      break;
+    case WM_WM_LOWER:
+      ErrorF ("\tWM_WM_RAISE\n");
+      break;
+    case WM_WM_MAP:
+      ErrorF ("\tWM_WM_MAP\n");
+      break;
+    case WM_WM_UNMAP:
+      ErrorF ("\tWM_WM_UNMAP\n");
+      break;
+    case WM_WM_KILL:
+      ErrorF ("\tWM_WM_KILL\n");
+      break;
+    default:
+      ErrorF ("Unknown Message.\n");
+      break;
+    }
+#endif
+
+  /* Increase the count of elements in the queue by one */
+  ++g_nQueueSize;
+
+  /* Release the queue mutex */
+  pthread_mutex_unlock (&pQueue->pmMutex);
+
+  /* Signal that the queue is not empty */
+  pthread_cond_signal (&pQueue->pcNotEmpty);
+}
+
+
+#if 0
+/*
+ * QueueSize - Return the size of the queue
+ */
+
+static int
+QueueSize (WMMsgQueuePtr pQueue)
+{
+  WMMsgNodePtr		pNode;
+  int			nSize = 0;
+  
+  /* Loop through all elements in the queue */
+  for (pNode = pQueue->pHead; pNode != NULL; pNode = pNode->pNext)
+    ++nSize;
+
+  return nSize;
+}
+#endif
+
+
+/*
+ * PopMessage - 
+ */
+
+static WMMsgNodePtr
+PopMessage (WMMsgQueuePtr pQueue)
+{
+  WMMsgNodePtr		pNode;
+
+  /* Lock the queue mutex */
+  pthread_mutex_lock (&pQueue->pmMutex);
+
+  /* Wait for --- */
+  while (pQueue->pHead == NULL)
+    {
+      pthread_cond_wait (&pQueue->pcNotEmpty, &pQueue->pmMutex);
+    }
+  
+  pNode = pQueue->pHead;
+  if (pQueue->pHead != NULL)
+    {
+      pQueue->pHead = pQueue->pHead->pNext;
+    }
+
+  if (pQueue->pTail == pNode)
+    {
+      pQueue->pTail = NULL;
+    }
+
+  /* Drop the number of elements in the queue by one */
+  --g_nQueueSize;
+
+#if CYGMULTIWINDOW_DEBUG
+  ErrorF ("Queue Size %d %d\n", g_nQueueSize, QueueSize(pQueue));
+#endif
+  
+  /* Release the queue mutex */
+  pthread_mutex_unlock (&pQueue->pmMutex);
+
+  return pNode;
+}
+
+
+#if 0
+/*
+ * HaveMessage - 
+ */
+
+static Bool
+HaveMessage (WMMsgQueuePtr pQueue, UINT msg, Window iWindow)
+{
+  WMMsgNodePtr pNode;
+  
+  for (pNode = pQueue->pHead; pNode != NULL; pNode = pNode->pNext)
+    {
+      if (pNode->msg.msg==msg && pNode->msg.iWindow==iWindow)
+	return True;
+    }
+  
+  return False;
+}
+#endif
+
+
+/*
+ * InitQueue - Initialize the Window Manager message queue
+ */
+
+static
+Bool
+InitQueue (WMMsgQueuePtr pQueue)
+{
+  /* Check if the pQueue pointer is NULL */
+  if (pQueue == NULL)
+    {
+      ErrorF ("InitQueue - pQueue is NULL.  Exiting.\n");
+      return FALSE;
+    }
+
+  /* Set the head and tail to NULL */
+  pQueue->pHead = NULL;
+  pQueue->pTail = NULL;
+
+  /* There are no elements initially */
+  g_nQueueSize = 0;
+
+#if CYGMULTIWINDOW_DEBUG
+  ErrorF ("InitQueue - Queue Size %d %d\n", g_nQueueSize, QueueSize(pQueue));
+#endif
+
+  ErrorF ("InitQueue - Calling pthread_mutex_init\n");
+
+  /* Create synchronization objects */
+  pthread_mutex_init (&pQueue->pmMutex, NULL);
+
+  ErrorF ("InitQueue - pthread_mutex_init returned\n");
+  ErrorF ("InitQueue - Calling pthread_cond_init\n");
+
+  pthread_cond_init (&pQueue->pcNotEmpty, NULL);
+
+  ErrorF ("InitQueue - pthread_cond_init returned\n");
+
+  return TRUE;
+}
+
+
+/*
+ * GetWindowName - 
+ */
+
+static void
+GetWindowName (Display *pDisplay, Window iWin, char **ppName)
+{
+  int			nResult, nNum;
+  char			**ppList;
+  XTextProperty		xtpName;
+  
+#if CYGMULTIWINDOW_DEBUG
+  ErrorF ("GetWindowName\n");
+#endif
+
+  /* Intialize ppName to NULL */
+  *ppName = NULL;
+
+  /* Try to get --- */
+  nResult = XGetWMName (pDisplay, iWin, &xtpName);
+  if (!nResult || !xtpName.value || !xtpName.nitems)
+    {
+      ErrorF ("GetWindowName - XGetWMName failed.  No name.\n");
+      return;
+    }
+  
+  /* */
+  if (xtpName.encoding == XA_STRING)
+    {
+      /* */
+      if (xtpName.value)
+	{
+	  *ppName = strdup ((char*)xtpName.value);
+	  XFree (xtpName.value);
+	}
+
+#if CYGMULTIWINDOW_DEBUG
+      ErrorF ("XA_STRING %s\n", *ppName);
+#endif
+    }
+  else
+    {
+      XmbTextPropertyToTextList (pDisplay, &xtpName, &ppList, &nNum);
+
+      /* */
+      if (nNum && *ppList)
+	{
+	  XFree (xtpName.value);
+	  *ppName = strdup (*ppList);
+	  XFreeStringList (ppList);
+	}
+
+#if CYGMULTIWINDOW_DEBUG
+      ErrorF ("%s %s\n", XGetAtomName (pDisplay, xtpName.encoding), *ppName);
+#endif
+    }
+
+
+#if CYGMULTIWINDOW_DEBUG
+  ErrorF ("-GetWindowName\n");
+#endif
+}
+
+
+/*
+ * Send a message to the X server from the WM thread
+ */
+
+static int
+SendXMessage (Display *pDisplay, Window iWin, Atom atmType, long nData)
+{
+  XEvent		e;
+
+  /* Prepare the X event structure */
+  e.type = ClientMessage;
+  e.xclient.window = iWin;
+  e.xclient.message_type = atmType;
+  e.xclient.format = 32;
+  e.xclient.data.l[0] = nData;
+  e.xclient.data.l[1] = CurrentTime;
+
+  /* Send the event to X */
+  return XSendEvent (pDisplay, iWin, False, NoEventMask, &e);
+}
+
+
+/*
+ * winMultiWindowWMProc
+ */
+
+static void *
+winMultiWindowWMProc (void *pArg)
+{
+  WMProcArgPtr		pProcArg = (WMProcArgPtr)pArg;
+  WMInfoPtr		pWMInfo = pProcArg->pWMInfo;
+  
+  /* Initialize the Window Manager */
+  winInitMultiWindowWM (pWMInfo, pProcArg);
+  
+#if CYGMULTIWINDOW_DEBUG
+  ErrorF ("winMultiWindowWMProc ()\n");
+#endif
+
+  /* Loop until we explicity break out */
+  for (;;)
+    {
+      WMMsgNodePtr	pNode;
+
+      /* Pop a message off of our queue */
+      pNode = PopMessage (&pWMInfo->wmMsgQueue);
+      if (pNode == NULL)
+	{
+	  /* Bail if PopMessage returns without a message */
+	  /* NOTE: Remember that PopMessage is a blocking function. */
+	  ErrorF ("winMultiWindowWMProc - Queue is Empty?\n");
+	  pthread_exit (NULL);
+	}
+
+#if CYGMULTIWINDOW_DEBUG
+      ErrorF ("winMultiWindowWMProc - %d ms MSG: %d ID: %d\n",
+	      GetTickCount (), (int)pNode->msg.msg, (int)pNode->msg.dwID);
+#endif
+      
+      /* Branch on the message type */
+      switch (pNode->msg.msg)
+	{
+#if 0
+	case WM_WM_MOVE:
+	  ErrorF ("\tWM_WM_MOVE\n");
+	  break;
+
+	case WM_WM_SIZE:
+	  ErrorF ("\tWM_WM_SIZE\n");
+	  break;
+#endif
+
+	case WM_WM_RAISE:
+#if CYGMULTIWINDOW_DEBUG
+	  ErrorF ("\tWM_WM_RAISE\n");
+#endif
+
+	  /* Raise the window */
+	  XRaiseWindow (pWMInfo->pDisplay, pNode->msg.iWindow);
+	  break;
+
+	case WM_WM_LOWER:
+#if CYGMULTIWINDOW_DEBUG
+	  ErrorF ("\tWM_WM_LOWER\n");
+#endif
+
+	  /* Lower the window */
+	  XLowerWindow (pWMInfo->pDisplay, pNode->msg.iWindow);
+	  break;
+
+	case WM_WM_MAP:
+#if CYGMULTIWINDOW_DEBUG
+	  ErrorF ("\tWM_WM_MAP\n");
+#endif
+	  {
+	    XWindowAttributes		attr;
+	    char			*pszName;
+#if 0
+	    XWMHints			*pHints;
+#endif
+
+	    /* Get the window attributes */
+	    XGetWindowAttributes (pWMInfo->pDisplay,
+				  pNode->msg.iWindow,
+				  &attr);
+	    if (!attr.override_redirect)
+	      {
+		/* Set the Windows window name */
+		GetWindowName(pWMInfo->pDisplay, pNode->msg.iWindow, &pszName);
+		SetWindowText (pNode->msg.hwndWindow, pszName);
+		free (pszName);
+	      }
+	  }
+	  break;
+
+	case WM_WM_UNMAP:
+#if CYGMULTIWINDOW_DEBUG
+	  ErrorF ("\tWM_WM_UNMAP\n");
+#endif
+	  
+	  /* Unmap the window */
+	  XUnmapWindow(pWMInfo->pDisplay, pNode->msg.iWindow);
+	  break;
+
+	case WM_WM_KILL:
+#if CYGMULTIWINDOW_DEBUG
+	  ErrorF ("\tWM_WM_KILL\n");
+#endif
+	  {
+	    int				i, n, found = 0;
+	    Atom			*protocols;
+	    
+	    /* --- */
+	    if (XGetWMProtocols (pWMInfo->pDisplay,
+				 pNode->msg.iWindow,
+				 &protocols,
+				 &n))
+	      {
+		for (i = 0; i < n; ++i)
+		  if (protocols[i] == pWMInfo->atmWmDelete)
+		    ++found;
+		
+		XFree (protocols);
+	      }
+
+	    /* --- */
+	    if (found)
+	      SendXMessage (pWMInfo->pDisplay,
+			    pNode->msg.iWindow,
+			    pWMInfo->atmWmProtos,
+			    pWMInfo->atmWmDelete);
+	    else
+	      XKillClient (pWMInfo->pDisplay,
+			   pNode->msg.iWindow);
+	  }
+	  break;
+
+	case WM_WM_ACTIVATE:
+#if CYGMULTIWINDOW_DEBUG
+	  ErrorF ("\tWM_WM_ACTIVATE\n");
+#endif
+	  
+	  /* Set the input focus */
+	  XSetInputFocus (pWMInfo->pDisplay,
+			  pNode->msg.iWindow,
+			  RevertToPointerRoot,
+			  CurrentTime);
+	  break;
+
+	case WM_WM_X_EVENT:
+	  /* Process all X events in the Window Manager event queue */
+	  FlushXEvents (pWMInfo);
+	  break;
+
+	default:
+	  ErrorF ("winMultiWindowWMProc - Unknown Message.\n");
+	  pthread_exit (NULL);
+	  break;
+	}
+
+      /* Free the retrieved message */
+      free (pNode);
+
+      /* Flush any pending events on our display */
+      XFlush (pWMInfo->pDisplay);
+    }
+
+  /* Free the condition variable */
+  pthread_cond_destroy (&pWMInfo->wmMsgQueue.pcNotEmpty);
+  
+  /* Free the mutex variable */
+  pthread_mutex_destroy (&pWMInfo->wmMsgQueue.pmMutex);
+  
+  /* Free the passed-in argument */
+  free (pProcArg);
+  
+#if CYGMULTIWINDOW_DEBUG
+  ErrorF("-winMultiWindowWMProc ()\n");
+#endif
+}
+
+
+/*
+ * FlushXEvents - Process any pending X events
+ */
+
+static Bool
+FlushXEvents (WMInfoPtr pWMInfo)
+{
+  XEvent		event;
+  
+#if CYGMULTIWINDOW_DEBUG
+  ErrorF ("FlushXEvents ()\n");
+#endif
+
+  /* Process all pending events */
+  while (XPending (pWMInfo->pDisplay))
+    {
+      /* Get the next event - will not block because one is ready */
+      XNextEvent (pWMInfo->pDisplay, &event);
+
+#if 0
+      /* Branch on the event type */
+      switch (event.type)
+	{
+	}
+#endif
+    }
+
+#if CYGMULTIWINDOW_DEBUG
+  ErrorF ("-FlushXEvents ()\n");
+#endif
+
+  return True;
+}
+
+
+/*
+ * winMultiWindowWMErrorHandler - Our application specific error handler
+ */
+
+static int
+winMultiWindowWMErrorHandler (Display *pDisplay, XErrorEvent *pErr)
+{
+  char pszErrorMsg[100];
+
+  if (pErr->request_code == X_ChangeWindowAttributes
+      && pErr->error_code == BadAccess)
+    {
+      ErrorF ("ChangeWindowAttributes BadAccess.\n");
+      pthread_exit (NULL);
+    }
+  
+  XGetErrorText (pDisplay,
+		 pErr->error_code,
+		 pszErrorMsg,
+		 sizeof (pszErrorMsg));
+  ErrorF ("ERROR: %s\n", pszErrorMsg);
+
+  if (pErr->error_code==BadWindow
+      || pErr->error_code==BadMatch
+      || pErr->error_code==BadDrawable)
+    {
+      pthread_exit (NULL);
+    }
+
+  pthread_exit (NULL);
+  return 0;
+}
+
+
+/*
+ * winInitWM - Entry point for the X server to spawn
+ * the Window Manager thread.  Called from
+ * winscrinit.c/winFinishScreenInitFB ().
+ */
+
+Bool
+winInitWM (void **ppWMInfo,
+	   pthread_t *ptWMProc,
+	   pthread_mutex_t *ppmServerStarted,
+	   int dwScreen)
+{
+  WMProcArgPtr		pArg = (WMProcArgPtr)malloc (sizeof(WMProcArgRec));
+  WMInfoPtr		pWMInfo = (WMInfoPtr)malloc (sizeof(WMInfoRec));
+  
+  /* Bail if the input parameters are bad */
+  if (pArg == NULL || pWMInfo == NULL)
+    {
+      ErrorF ("winInitWM - malloc fail.\n");
+      return FALSE;
+    }
+  
+  /* Set a return pointer to the Window Manager info structure */
+  *ppWMInfo = pWMInfo;
+
+  /* Setup the argument structure for the thread function */
+  pArg->dwScreen = dwScreen;
+  pArg->pWMInfo = pWMInfo;
+  pArg->ppmServerStarted = ppmServerStarted;
+  
+  /* Intialize the message queue */
+  if (!InitQueue (&pWMInfo->wmMsgQueue))
+    {
+      ErrorF ("winInitWM - InitQueue () failed.\n");
+      return FALSE;
+    }
+  
+  /* Spawn a thread for the Window Manager */
+  if (pthread_create (ptWMProc, NULL, winMultiWindowWMProc, pArg))
+    {
+      /* Bail if thread creation failed */
+      ErrorF ("winInitWM - pthread_create failed.\n");
+      return FALSE;
+    }
+
+#if CYGDEBUG || YES
+  ErrorF ("winInitWM - Returning.\n");
+#endif
+
+  return TRUE;
+}
+
+
+/*
+ * winInitMultiWindowWM - 
+ */
+
+Bool
+winClipboardDetectUnicodeSupport ();
+
+static void
+winInitMultiWindowWM (WMInfoPtr pWMInfo, WMProcArgPtr pProcArg)
+{
+  int                   iRetries = 0;
+  char			pszDisplay[512];
+  int			iReturn;
+  Bool			fUnicodeSupport;
+
+  ErrorF ("winInitMultiWindowWM - Hello\n");
+
+  /* Check that argument pointer is not invalid */
+  if (pProcArg == NULL)
+    {
+      ErrorF ("winInitMultiWindowWM - pProcArg is NULL, bailing.\n");
+      pthread_exit (NULL);
+    }
+
+  ErrorF ("winInitMultiWindowWM - Calling pthread_mutex_lock ()\n");
+
+  /* Grab our garbage mutex to satisfy pthread_cond_wait */
+  iReturn = pthread_mutex_lock (pProcArg->ppmServerStarted);
+  if (iReturn != 0)
+    {
+      ErrorF ("winInitMultiWindowWM - pthread_mutex_lock () failed: %d\n",
+	      iReturn);
+      pthread_exit (NULL);
+    }
+
+  ErrorF ("winInitMultiWindowWM - pthread_mutex_lock () returned.\n");
+
+  /* Do we have Unicode support? */
+  fUnicodeSupport = winClipboardDetectUnicodeSupport ();
+
+  /* Set the current locale?  What does this do? */
+  if (fUnicodeSupport && !g_fCalledSetLocale)
+    {
+      ErrorF ("winInitMultiWindowWM - Calling setlocale ()\n");
+      if (!setlocale (LC_ALL, ""))
+	{
+	  ErrorF ("winInitMultiWindowWM - setlocale () error\n");
+	  pthread_exit (NULL);
+	}
+      ErrorF ("winInitMultiWindowWM - setlocale () returned\n");
+      
+      /* See if X supports the current locale */
+      if (XSupportsLocale () == False)
+	{
+	  ErrorF ("winInitMultiWindowWM - Locale not supported by X\n");
+	  pthread_exit (NULL);
+	}
+    }
+
+  /* Flag that we have called setlocale */
+  g_fCalledSetLocale = TRUE;
+  
+  /* Release the garbage mutex */
+  pthread_mutex_unlock (pProcArg->ppmServerStarted);
+
+  ErrorF ("winInitMultiWindowWM - pthread_mutex_unlock () returned.\n");
+
+  /* Allow multiple threads to access Xlib */
+  if (XInitThreads () == 0)
+    {
+      ErrorF ("winInitMultiWindowWM - XInitThreads () failed.\n");
+      pthread_exit (NULL);
+    }
+  
+  ErrorF ("winInitMultiWindowWM - XInitThreads () returned.\n");
+
+  /* Set jump point for Error exits */
+  iReturn = setjmp (g_jmpEntry);
+  
+  /* Check if we should continue operations */
+  if (iReturn != WIN_JMP_ERROR_IO
+      && iReturn != WIN_JMP_OKAY)
+    {
+      /* setjmp returned an unknown value, exit */
+      ErrorF ("winInitMultiWindowWM - setjmp returned: %d exiting\n",
+	      iReturn);
+      pthread_exit (NULL);
+    }
+  else if (iReturn == WIN_JMP_ERROR_IO)
+    {
+      ErrorF ("winInitMultiWindowWM - setjmp returned WIN_JMP_ERROR_IO\n");
+    }
+
+  /* Setup the display connection string x */
+  snprintf (pszDisplay, 512, "127.0.0.1:%s.%d", display, pProcArg->dwScreen);
+
+  /* Print the display connection string */
+  ErrorF ("winInitMultiWindowWM - DISPLAY=%s\n", pszDisplay);
+  
+  /* Open the X display */
+  do
+    {
+      /* Try to open the display */
+      pWMInfo->pDisplay = XOpenDisplay (pszDisplay);
+      if (pWMInfo->pDisplay == NULL)
+	{
+	  ErrorF ("winInitMultiWindowWM - Could not open display, try: %d, "
+		  "sleeping: %d\n\f",
+		  iRetries + 1, WIN_CONNECT_DELAY);
+	  ++iRetries;
+	  sleep (WIN_CONNECT_DELAY);
+	  continue;
+	}
+      else
+	break;
+    }
+  while (pWMInfo->pDisplay == NULL && iRetries < WIN_CONNECT_RETRIES);
+  
+  /* Make sure that the display opened */
+  if (pWMInfo->pDisplay == NULL)
+    {
+      ErrorF ("winInitMultiWindowWM - Failed opening the display, "
+	      "giving up.\n\f");
+      pthread_exit (NULL);
+    }
+
+  ErrorF ("winInitMultiWindowWM - XOpenDisplay () returned and "
+	  "successfully opened the display.\n");
+  
+  /* Install our error handler */
+  XSetErrorHandler (winMultiWindowWMErrorHandler);
+  XSetIOErrorHandler (winMutliWindowWMIOErrorHandler);
+
+  /* Create some atoms */
+  pWMInfo->atmWmProtos = XInternAtom (pWMInfo->pDisplay,
+				      "WM_PROTOCOLS",
+				      False);
+  pWMInfo->atmWmDelete = XInternAtom (pWMInfo->pDisplay,
+				      "WM_DELETE_WINDOW",
+				      False);
+}
+
+
+/*
+ * winSendMessageToWM - Send a message from the X thread to the WM thread
+ */
+
+void
+winSendMessageToWM (void *pWMInfo, winWMMessagePtr pMsg)
+{
+  WMMsgNodePtr pNode;
+  
+#if CYGMULTIWINDOW_DEBUG
+  ErrorF ("winSendMessageToWM ()\n");
+#endif
+  
+  pNode = (WMMsgNodePtr)malloc(sizeof(WMMsgNodeRec));
+  if (pNode != NULL)
+    {
+      memcpy (&pNode->msg, pMsg, sizeof(winWMMessageRec));
+      PushMessage (&((WMInfoPtr)pWMInfo)->wmMsgQueue, pNode);
+    }
+}
+
+
+/*
+ * winMutliWindowWMIOErrorHandler - Our application specific IO error handler
+ */
+
+static int
+winMutliWindowWMIOErrorHandler (Display *pDisplay)
+{
+  printf ("\nwinMutliWindowWMIOErrorHandler!\n\n");
+
+  /* Restart at the main entry point */
+  longjmp (g_jmpEntry, WIN_JMP_ERROR_IO);
+  
+  return 0;
+}