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CentOS 7.0 - man page for tk_freexid (centos section 3)

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.
_________________________________________________________________

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 corre-
       sponding Xlib free procedure, 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)


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