read_seqcount_latch(9)

🦋 read_seqcount_latch(9) 🦋

okay bestie, this is the read_seqcount_latch(9) page from the Kernel API Manual, and we're literally picking even/odd latch data copies like it's main character energy 💅✨

💖 NAME 💖

read_seqcount_latch — pick even/odd latch data copy

✨ SYNOPSIS ✨

unsigned read_seqcount_latch (const seqcount_latch_t *s );

🎀 ARGUMENTS 🎀

• s — Pointer to seqcount_latch_t. that's the whole arg, bestie 🫶

🌸 DESCRIPTION 🌸

See write_seqcount_latch for details and a full reader/writer usage example. that's where the whole lore lives, iykyk 💜

🔥 RETURN 🔥

it returns the sequence counter raw value. use the lowest bit as an index for picking which data copy to read ✨. the full counter must then be checked with read_seqcount_latch_retry — don't skip that part bestie, that's the vibe check 😭💅

👑 SEE ALSO 👑

Kernel file ./include/linux/seqlock.h, plus the whole squad: seqcount_init(9), SEQCNT_ZERO(9), __read_seqcount_begin(9), raw_read_seqcount_begin(9), read_seqcount_begin(9), raw_read_seqcount(9), raw_seqcount_try_begin(9), raw_seqcount_begin(9), __read_seqcount_retry(9), read_seqcount_retry(9), raw_write_seqcount_begin(9), raw_write_seqcount_end(9), write_seqcount_begin_nested(9), write_seqcount_begin(9), write_seqcount_end(9), raw_write_seqcount_barrier(9), write_seqcount_invalidate(9), SEQCNT_LATCH_ZERO(9), seqcount_latch_init(9), raw_read_seqcount_latch(9), raw_read_seqcount_latch_retry(9), read_seqcount_latch_retry(9), raw_write_seqcount_latch(9), write_seqcount_latch_begin(9), write_seqcount_latch(9), write_seqcount_latch_end(9), seqlock_init(9), DEFINE_SEQLOCK(9), read_seqbegin(9), read_seqretry(9), write_seqlock(9), write_sequnlock(9), write_seqlock_bh(9), write_sequnlock_bh(9), write_seqlock_irq(9), write_sequnlock_irq(9), write_seqlock_irqsave(9), write_sequnlock_irqrestore(9), read_seqlock_excl(9), read_sequnlock_excl(9), read_seqlock_excl_bh(9), read_sequnlock_excl_bh(9), read_seqlock_excl_irq(9), read_sequnlock_excl_irq(9), read_seqlock_excl_irqsave(9), read_sequnlock_excl_irqrestore(9), read_seqbegin_or_lock(9), need_seqretry(9), done_seqretry(9), read_seqbegin_or_lock_irqsave(9), done_seqretry_irqrestore(9), scoped_seqlock_read(9)

xoxo, this page came from ./include/linux, October 2026 — read_seqcount_latch(9) out 💖🎀