CK_PR_BTS(3)

💖 CK_PR_BTS 💖

okay bestie, welcome to the ck_pr_bts(3) page — that's the manual name, and yes it's from Concurrency Kit, the libck girlies' fave. it's giving atomic bit test-and-set, and it ATE. no cap. ✨

🌸 NAME 🌸

ck_pr_bts_ptr, ck_pr_bts_uint, ck_pr_bts_int, ck_pr_bts_64, ck_pr_bts_32, ck_pr_bts_16 — atomic bit test-and-set operations 💅

📚 LIBRARY 📚

Concurrency Kit (libck, -lck) — literally the whole squad lives here 🫶

✨ SYNOPSIS ✨

#include <ck_pr.h>

bool
ck_pr_bts_ptr(void *target, unsigned int bit_index);

bool
ck_pr_bts_uint(uint *target, unsigned int bit_index);

bool
ck_pr_bts_int(int *target, unsigned int bit_index);

bool
ck_pr_bts_64(uint64_t *target, unsigned int bit_index);

bool
ck_pr_bts_32(uint32_t *target, unsigned int bit_index);

bool
ck_pr_bts_16(uint16_t *target, unsigned int bit_index);

like… pick your fighter. one for every width, and they all do the same slay move 💖

🦋 DESCRIPTION 🦋

so the ck_pr_bts(3) family of functions atomically fetches the value of the bit in target at index bit_index, and then sets that bit to 1. 🔥

that's it. that's the whole vibe. read the bit, flip it to 1, and do it atomically so nobody else can sneak in mid-move. main character energy, fr fr.

🎀 RETURN VALUES 🎀

this family of functions returns the original value of the bit at offset bit_index that is in the value pointed to by target.

ngl that's the important part — you get the before, not the after. it's a glow-up reveal, not a spoiler. 💅

lowkey reminder: the return is the bit as it was before the set, so don't @ me if you expected the new value bestie 😭

🌈 SEE ALSO 🌈

• ck_pr_fence_load(3)
• ck_pr_fence_load_depends(3)
• ck_pr_fence_store(3)
• ck_pr_fence_memory(3)
• ck_pr_load(3)
• ck_pr_store(3)
• ck_pr_fas(3)
• ck_pr_faa(3)
• ck_pr_inc(3)
• ck_pr_dec(3)
• ck_pr_neg(3)
• ck_pr_not(3)
• ck_pr_sub(3)
• ck_pr_and(3)
• ck_pr_or(3)
• ck_pr_xor(3)
• ck_pr_add(3)
• ck_pr_btc(3)
• ck_pr_btr(3)
• ck_pr_cas(3)

additional information available at http://concurrencykit.org/ 🌐 go click it, bestie, it's iconic

k bye, mwah 💋 this page was dated April 11, 2013 and it's still serving ck_pr_bts(3) realness to this very day. obsessed. 💖✨🎀🦋🌸💅🫶