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Xwindows in unix

 
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Old 10-25-2010
Xwindows in unix
the question i have is why Xwindows(GUI) is not part of kernel level but part of user level in unix while in windows the GUI (Windows manager) it is part of kernel level.


For one thing is when GUI hangs it does not crash the whole system as in Windows

But windows avoids context switching.....

can i have some other points....

Thanking in advance
 
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LEARN ABOUT CENTOS

glutcreatesubwindow

UNTITLED
							       LOCAL								  UNTITLED

NAME

     glutCreateSubWindow -- Create a subwindow

LIBRARY

     OpenGLUT - window

SYNOPSIS

     #include <openglut.h>

     int
     glutCreateSubWindow(int parentID, int x, int y, int w, int h);

PARAMETERS

      parentID	  Parent window identifier

      x 	  Horizontal position of subwindow

      y 	  Vertical position of subwindow

      w 	  Width of subwindow

      h 	  Height of subwindow

DESCRIPTION

     In almost every regard that is important to you, a subwindow is like a top-level window.  It has a window id; it has its own set of event
     callbacks; you can render to it; you are notified of its creation; ...

     A subwindow lives inside of some other window (possibly a top-level window, possibly another subwindow).  Because of this, it generally only
     interacts with other windows of your own creation, hence it is not subjected to a window manager.	This is the primary source for its differ-
     ences from a top-level window:

      - There are no borders or decorations.
      - There is no title bar, hence no title.
      - Requests tend to be acted on a little more directly, without interference from a window manager.
      - The subwindow inherits the display mode of its parent.

     Like a top-level window, you  must   register a display callback function if you wish to use glutMainloop().

     A notable case where this function can fail is for offscreen windows.  A coherent concept of a subwindow of an offscreen window would intro-
     duce more complication than is presently believed to be worthwhile.  Attempting such a window presently just fails.  Failure is denoted by a
     0	window id   being returned.

     Subwindows can be very useful for partitioning a window into GUI elements: They have their own input callbacks, so you don't have to figure
     out which window an event is for.	Graphics are clipped to the boundaries of your subwindows, so you do not need to worry much about where
     your drawing goes.  Because windows and subwindows work almost identically from the perspective of a GLUT program, it is relatively easy to
     move a cluster of related controls into a separate top-level window---or, conversely, embed what was a top-level window inside of another
     window.  OpenGLUT can also report some basic statistics about your (sub)window, relieving you of the duty of tracking all of that information
     for yourself.

SEE ALSO

     glutCreateWindow(3) glutDestroyWindow(3) glutCreateMenuWindow(3)

								       Epoch