Tk_FreeXId(3tk)

📦 version 8.6.18, in debian bookworm, debian trixie, ubuntu jammy, ubuntu noble, ubuntu questing, ubuntu resolute, ubuntu stonking

✨ Tk_FreeXId ✨

okay bestie, welcome to the Tk_FreeXId(3tk) page 💖 this one lives in the Tk Library Procedures crew, and it's honestly such a small little function with such a big "you're welcome" energy. let's get into it 🫶

🌸 NAME 🌸

Tk_FreeXId — make X resource identifier available for reuse 💅

✨ SYNOPSIS ✨

#include <tk.h>

Tk_FreeXId(display, id)

🎀 ARGUMENTS 🎀

  • Display *display (in) — the Display for which id was allocated. it's giving "which screen are we talking about, bestie" 🖥️
  • XID id (in) — the identifier of the X resource that is no longer in use. and like, that's window, font, pixmap, cursor, graphics context, or colormap — the whole little family 🌈

💖 DESCRIPTION 💖

so here's the tea 🍓 the default allocator for resource identifiers that Xlib hands you is very simple-minded, and it does not let resource identifiers be re-used. like, not even a little. and if a long-running application reaches the end of the resource id space? it generates an X protocol error and crashes. 😭 not cute. not the vibe.

Tk said "no, actually" and replaces that default id allocator with its own allocator, which does allow identifiers to be reused. icon behaviour, honestly 👑

but for that to work, Tk_FreeXId has to be called to tell the allocator about resources that have been freed. that's the whole job.

here's the part where Tk is already doing the most for you: 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 yourself. she already handled it 💅

however — and this is the important bit, no cap — 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. you have to do that one yourself, bestie.

⚠️ and 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. that's the crash pipeline. we are not doing that. 🙈

🌟 KEYWORDS 🌟

  • resource identifier

and that's the whole page, you ate that 🎀

signing off with the classic footer energy: this is the Tk_FreeXId(3tk) manual page from Tk 4.0 — yeah, she's an old icon but she's still serving 💜 mwah, go free your X ids responsibly ✨

📦 where this page comes from