1Tk_FreeXId(3) Tk Library Procedures Tk_FreeXId(3)
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8 Tk_FreeXId - make X resource identifier available for reuse
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11 #include <tk.h>
12 Tk_FreeXId(display, id)
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16 Display *display (in) Display for which id was allocated.
17 XID id (in) Identifier of X resource (window, font,
19 pixmap, cursor, graphics context, or
20 colormap) that is no longer in use.
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24 The default allocator for resource identifiers provided by Xlib is very
25 simple-minded and does not allow resource identifiers to be re-used.
26 If a long-running application reaches the end of the resource id space,
27 it will generate an X protocol error and crash. Tk replaces the
28 default id allocator with its own allocator, which allows identifiers
29 to be reused. In order for this to work, Tk_FreeXId must be called to
30 tell the allocator about resources that have been freed. Tk automati‐
31 cally calls Tk_FreeXId whenever it frees a resource, so if you use pro‐
32 cedures like Tk_GetFont, Tk_GetGC, and Tk_GetPixmap then you need not
33 call Tk_FreeXId. However, if you allocate resources directly from
34 Xlib, for example by calling XCreatePixmap, then you should call
35 Tk_FreeXId when you call the corresponding Xlib free procedure, such as
36 XFreePixmap. If you do not call Tk_FreeXId then the resource identi‐
37 fier will be lost, which could cause problems if the application runs
38 long enough to lose all of the available identifiers.
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41 resource identifier
42Tk 4.0 Tk_FreeXId(3)