fpga_mgr_lock(9)

📦 version 7.3.1, in nixpkgs unstable

💅 fpga_mgr_lock(9) — the Kernel API Manual moment

okay so bestie, welcome to fpga_mgr_lock(9), live from the Kernel API Manual. this is the little function that goes "excuse me, this FPGA is mine" before anybody touches the hardware, and honestly? iconic gatekeeping behavior. 🎀

✨ NAME ✨

fpga_mgr_lock — locks the FPGA manager so it's for your exclusive use, no sharing, no line-cutting 🫶

🌸 SYNOPSIS 🌸

int fpga_mgr_lock (struct fpga_manager *mgr );

that's it. one arg, one int coming back. we love a low-effort queen. ✨

🦋 ARGUMENTS 🦋

  • mgr — the FPGA manager. that's the whole vibe. it's a pointer to your manager bestie and you're about to ask it very politely for the mutex. 👑

💖 DESCRIPTION 💖

so here's the tea ☕ — you hand this function a pointer to an FPGA Manager (the kind you'd get from fpga_mgr_get or of_fpga_mgr_put), and it attempts to get the mutex for you. attempt is the key word. it's giving "trying my best" energy, ngl.

The user should call fpga_mgr_lock and verify that it returns 0 before attempting to program the FPGA. like, fr fr, do the vibe check first. do not skip the vibe check. 😭

Likewise — and this is the part everyone forgets — the user should call fpga_mgr_unlock when done programming the FPGA. lock it, do your little programming thing, unlock it. balance. harmony. the circle of life. 🌈

no cap, if you skip checking the return value you are programming an FPGA you don't actually hold the lock on and that is not the main character energy you want. 💀

⭐ RETURN ⭐

  • 0 for success 🎉 (the good ending)
  • -EBUSY when it's a no 🚫 (someone else has it, try again later bestie)

👑 SEE ALSO 👑

Kernel file ./drivers/fpga/fpga-mgr.c — go read it, it's right there, it's free real estate 📖

and then the whole friend group:

like, the whole roster. the entire cast. 🧚💜

and that's the page bestie!! ily, go lock your mutex responsibly 💅✨

— signed, sealed, delivered from ./drivers/fpga, October 2026 🍓🎀🦋

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