Tk_FreeXId - make X resource identifier available for reuse
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_GetFontStruct,
Tk_GetGC, and Tk_GetPixmap then you need not call
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
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.
- 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.
Copyright © 1990 The Regents of the University of California.
Copyright © 1994-1996 Sun Microsystems, Inc.
Copyright © 1995-1997 Roger E. Critchlow Jr.