redhat man page for 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 automatically calls Tk_FreeXId whenever it frees a resource, so if
       you use procedures 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 proce-
       dure, such as XFreePixmap.  If you do not 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)