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Initial check-in based on 2.1.5 (SGI IRIX) source tree.

/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */

/*-------------------------------------------------------------
 *  This is an example from The Inventor Toolmaker,
 *  chapter 11.
 *
 *  This is the source code for SoXt::mainLoop().
 *------------------------------------------------------------*/

void
SoXt::mainLoop()
{
    XtAppContext context = getAppContext();
    XEvent event;
    
    for (;;) {
        SoXt::nextEvent(context, &event);
        SoXt::dispatchEvent(&event);
    };
}

void
SoXt::nextEvent(XtAppContext appContext, XEvent *event)
{
    XtAppNextEvent(appContext, event);
}

Boolean
SoXt::dispatchEvent(XEvent *event)
{
    Boolean success = True;
     
    if(event->type >= LASTEvent) {
        XtEventHandler proc;
        XtPointer clientData;
        Widget w;
        Boolean dummy;
        
        // Get the event handling function which was
        // registered with Inventor for handling this
        // event type in this widget
        SoXt::getExtensionEventHandler(event, w, proc, clientData);
        
        // Call the event handler!
        if (proc == NULL)
            success = False;
        else
            (*proc) (w, clientData, event, &dummy);
        
    }
    
    // else it is not an extension event - let Xt dispatch it
    else success = XtDispatchEvent(event);
    
    return success;
}