Tk_FreeXId

Tk_FreeXId(3)                Tk Library Procedures               Tk_FreeXId(3)



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NAME
       Tk_FreeXId - make X resource identifier available for reuse

SYNOPSIS
       #include <tk.h>

       Tk_FreeXId(display, id)

ARGUMENTS
       Display   *display   (in)      Display for which id was allocated.

       XID       id         (in)      Identifier  of X resource (window, font,
                                      pixmap,  cursor,  graphics  context,  or
                                      colormap) that is no longer in use.
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DESCRIPTION
       The default allocator for resource identifiers provided by Xlib is very
       simple-minded and does not allow resource identifiers  to  be  re-used.
       If a long-running application reaches the end of the resource id space,
       it will generate an X  protocol  error  and  crash.   Tk  replaces  the
       default  id  allocator with its own allocator, which allows identifiers
       to be reused.  In order for this to work, Tk_FreeXId must be called  to
       tell  the allocator about resources that have been freed.  Tk automati-
       cally calls Tk_FreeXId whenever it frees a resource, so if you use pro-
       cedures  like  Tk_GetFont, Tk_GetGC, and Tk_GetPixmap then you need not
       call Tk_FreeXId.  However, if  you  allocate  resources  directly  from
       Xlib,  for  example  by  calling  XCreatePixmap,  then  you should call
       Tk_FreeXId when you call the corresponding Xlib free procedure, such as
       XFreePixmap.  If you don't call Tk_FreeXId then the resource identifier
       will be lost, which could cause problems if the application  runs  long
       enough to lose all of the available identifiers.


KEYWORDS
       resource identifier



Tk                                    4.0                        Tk_FreeXId(3)