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 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)