g+
g+ Communities
Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  <20082009  2010  2011  2012  2013  2014  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  <20082009  2010  2011  2012  2013  2014 
<== Date ==> <== Thread ==>

Subject: Re: edm troubles
From: John Sinclair <sinclairjw@ornl.gov>
To: mattei pierre <pierre.mattei@cea.fr>, Tech-talk <tech-talk@aps.anl.gov>
Date: Mon, 07 Jan 2008 12:30:14 -0500
Pierre,

There is a problem with the Xt lib version distributed with RHEL5. Someone suggested that the latest
version may be fixed but I'm not entirely sure about this. At the least, make sure you do have the latest
version of X and Xt lib. Motif is not a problem.


I have enclosed a test program that may demonstrate the problem. To build, place 1.c and makefile
in a directory, cd into that directory, and type "make". This will build the executable file named 1.
To run type "./1". The program launches a window with a menu bar to open additional windows.
These additional windows contain a menu bar with an "exit" entry to close the window. In my
experience, opening several of these windows (sometimes a few, sometimes 20-30) and then closing
them eventually causes the same crash (at least the crash dump looks the same).


This crash has an interesting history. As you may know, the XFree86 development was taken over
by X.org because of a license issue in a particular version of XFree86. This same bug existed in a
past version of the XFree86 distribution. Fortunately, it was fixed promptly. When I look at the crash dump,
I strongly suspect the X.org development is following along the same path and has duplicated this bug.


I am sending a copy of this reply to tech-talk in case anyone has solved this problem.

John Sinclair

mattei pierre wrote:
Hello John,
I am switching from MEDM to EDM for a new application and I have some troubles during execution. EDM have sometimes crashes with one of these messages :
-segmentation error (most frequently)
-xtErrorHandler - Object "(null)" does not have windowed ancestor
-xtErrorHandler - Cannot find callback list in XtCallCallbacks
Too many Xt errors
-xtErrorHandler - XtRemoveGrab asked to remove a widget not on the list
-xtErrorHandler - Cannot find callback list in XtCallCallbacks
Too many Xt error


I think I follow all instructions during the installation.
I uses RHEL5, EPICS base-3.14.9, openmotif, X11 etc...

Have you any ideas of something I have done wrong ?

Best regards,


/* ---------------------------------------------
 *
 * This application creates a main window and raises it
 * approximately every 3 seconds. The only menu option
 * is "exit".
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <math.h>
#include <sys/types.h>
#include <sys/time.h>
#include <time.h>
#include <wait.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>

#include <X11/Xlib.h>
#include <X11/Intrinsic.h>
#include <Xm/Xm.h>
#include <Xm/AtomMgr.h>
#include <Xm/Protocols.h>
#include <Xm/MainW.h>
#include <Xm/PushB.h>
#include <Xm/CascadeB.h>
#include <Xm/RowColumn.h>

static int g_exit = 0;
XtAppContext app;
Display *display;
Widget widgetToKill = NULL;

void exit_cb (
  Widget w,
  XtPointer client,
  XtPointer call )
{

int *flag = (int *) client;

  printf( "exit_cb callback function was invoked\n" );

  *flag = 1;

}

void exitOne_cb (
  Widget w,
  XtPointer client,
  XtPointer call )
{

  printf( "exitOne_cb callback function was invoked\n" );

  do {
    widgetToKill = w;
    w = XtParent( w );
  } while ( w );

}

void newWin_cb (
  Widget w,
  XtPointer client,
  XtPointer call )
{

Widget appTop1, mainWin1, menuBar1, filePullDown1, fileCascade1, exitB1;
XmString menuStr, str;
Atom wm_delete_window;

  appTop1 = XtVaAppCreateShell( NULL, "test", applicationShellWidgetClass,
   display,
   XmNiconic, False,
   XmNmappedWhenManaged, True,
   NULL );

  mainWin1 = XtVaCreateManagedWidget( "main", xmMainWindowWidgetClass,
   appTop1,
   XmNscrollBarDisplayPolicy, XmAS_NEEDED,
   XmNscrollingPolicy, XmAUTOMATIC,
   NULL );

  menuBar1 = XmCreateMenuBar( mainWin1, "menubar", NULL, 0 );

  filePullDown1 = XmCreatePulldownMenu( menuBar1, "file", NULL, 0 );

  menuStr = XmStringCreateLocalized( "file" );
  fileCascade1 = XtVaCreateManagedWidget( "filemenu", xmCascadeButtonWidgetClass,
   menuBar1,
   XmNlabelString, menuStr,
   XmNmnemonic, 'f',
   XmNsubMenuId, filePullDown1,
   NULL );
  XmStringFree( menuStr );

  str = XmStringCreateLocalized( "exit" );
  exitB1 = XtVaCreateManagedWidget( "pb", xmPushButtonWidgetClass,
   filePullDown1,
   XmNlabelString, str,
   NULL );
  XmStringFree( str );
  XtAddCallback( exitB1, XmNactivateCallback, exitOne_cb,
   (XtPointer) &g_exit );

  XtManageChild( menuBar1 );

  XtRealizeWidget( appTop1 );

  wm_delete_window = XmInternAtom( display, "WM_DELETE_WINDOW", False );
  XmAddWMProtocolCallback( appTop1, wm_delete_window,
   exitOne_cb, (XtPointer) &g_exit );
  XtVaSetValues( appTop1, XmNdeleteResponse, XmDO_NOTHING, NULL );

}

int main (
  int argc,
  char **argv
) {

Widget appTop, mainWin, menuBar, filePullDown, fileCascade, exitB;
XmString menuStr, str;
XEvent Xev;
int result, isXEvent, n, count;
struct timespec req, rem;
Atom wm_delete_window;

  XtToolkitInitialize();
  app = XtCreateApplicationContext();

  display = XtOpenDisplay( app, NULL, NULL, "test", NULL, 0, &argc,
   argv );

  appTop = XtVaAppCreateShell( NULL, "test", applicationShellWidgetClass,
   display,
   XmNiconic, False,
   XmNmappedWhenManaged, True,
   NULL );

  mainWin = XtVaCreateManagedWidget( "main", xmMainWindowWidgetClass,
   appTop,
   XmNscrollBarDisplayPolicy, XmAS_NEEDED,
   XmNscrollingPolicy, XmAUTOMATIC,
   NULL );

  menuBar = XmCreateMenuBar( mainWin, "menubar", NULL, 0 );

  filePullDown = XmCreatePulldownMenu( menuBar, "file", NULL, 0 );

  menuStr = XmStringCreateLocalized( "file" );
  fileCascade = XtVaCreateManagedWidget( "filemenu", xmCascadeButtonWidgetClass,
   menuBar,
   XmNlabelString, menuStr,
   XmNmnemonic, 'f',
   XmNsubMenuId, filePullDown,
   NULL );
  XmStringFree( menuStr );

  str = XmStringCreateLocalized( "new" );
  exitB = XtVaCreateManagedWidget( "pb", xmPushButtonWidgetClass,
   filePullDown,
   XmNlabelString, str,
   NULL );
  XmStringFree( str );
  XtAddCallback( exitB, XmNactivateCallback, newWin_cb,
   (XtPointer) &g_exit );

  XtManageChild( menuBar );

  XtRealizeWidget( appTop );

  wm_delete_window = XmInternAtom( display, "WM_DELETE_WINDOW", False );
  XmAddWMProtocolCallback( appTop, wm_delete_window,
   exit_cb, (XtPointer) &g_exit );
  XtVaSetValues( appTop, XmNdeleteResponse, XmDO_NOTHING, NULL );

  //-------------------------------------------

  n = 0;

  while ( !g_exit ) {

    count = 1000;

    do {
      result = XtAppPending( app );
      if ( result ) {
        isXEvent = XtAppPeekEvent( app, &Xev );
        if ( isXEvent ) {
          if ( Xev.type != Expose ) {
            XtAppProcessEvent( app, result );
          }
          else {
            XtAppProcessEvent( app, result );
          }
        }
        else { // process all timer or alternate events
          XtAppProcessEvent( app, result );
        }
      }
      count--;
    } while ( result && count );

    req.tv_sec = 0;
    req.tv_nsec = 100000000;
    nanosleep( &req, &rem );

    // raise window approx every 3 seconds
    n++;
    if ( n == 30 ) {
      n = 0;
      printf( "call XRaiseWindow\n" );
      XRaiseWindow( display, XtWindow(appTop) );
    }

    if ( widgetToKill ) {
      XtDestroyWidget( widgetToKill );
      widgetToKill = NULL;
    }

  }

  return 0;

}
CFLAGS = -Wall -O0 -g
LDFLAGS = -g

all : 1

1 : 1.o
	g++ $(LDFLAGS) -o 1 \
	-L/usr/X11R6/lib \
	-lXm -lXt -lX11 \
	1.o

1.o : 1.c
	cc $(CFLAGS) -o 1.o -c 1.c

Navigate by Date:
Prev: RE:problem in running application of PSM6003 zhangdemin99
Next: RE: Help with udev Mark Rivers
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  <20082009  2010  2011  2012  2013  2014 
Navigate by Thread:
Prev: RE:problem in running application of PSM6003 zhangdemin99
Next: Alarm Handler on 64-bit Peter Medvescek
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  <20082009  2010  2011  2012  2013  2014 
ANJ, 02 Sep 2010 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· EPICSv4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·