dma_fence_check_and_signal(9)

📦 version 7.3.1, in nixpkgs unstable

✨ dma_fence_check_and_signal ✨

okay so bestie, we're in the Kernel API Manual today and the function on the slab is dma_fence_check_and_signal(9). it's giving "one job, done flawlessly" energy and honestly? obsessed 💅

🌸 NAME 🌸

dma_fence_check_and_signal — signal the fence if it's not yet signaled

like, that's literally it. that's the whole gig. 🎀

🦋 SYNOPSIS 🦋

bool dma_fence_check_and_signal (struct dma_fence *fence );

💜 ARGUMENTS 💜

  • fence — the fence to check and signal. that's the one, bestie. hand her over 🫶

🔥 DESCRIPTION 🔥

So here's the vibe: this function checks whether a fence was signaled, and if it was not yet signaled, it signals it. that's the whole arc. check → signal if needed → done ✨

and the way that all of this is done in a race-free manner? that's the iconic part. no cap, no weird little timing gremlins sneaking in between the check and the signal — the whole thing is one smooth, atomic-feeling little moment 🔥👑

fr fr though — "race-free" is the load-bearing phrase here. that's the entire reason this function exists as a single call instead of you writing the check-then-signal dance yourself. respect it 🙈

⭐ RETURN ⭐

  • true — if fence has been signaled already (someone beat you to it, but like, in a good way 💖)
  • false — otherwise 🍓

🌈 SEE ALSO 🌈

Kernel file ./drivers/dma-buf/dma-fence.c — the source material, the mothership 🧚

the whole friend group:

like, the entire roster showed up. main character energy from every single one 💀👑

that's the page, bestie!! stay race-free out there 💖 🌸

this has been dma_fence_check_and_signal(9) from ./drivers/dma-buf, Kernel API Manual, dated October 2026 — mwah, go signal a fence responsibly 🫶✨

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