start_poll_synchronize_srcu(9)

💖 start_poll_synchronize_srcu(9) 💖

okay so this is straight out of the Kernel API Manual, bestie — the start_poll_synchronize_srcu(9) page, and it's literally about handing you a cookie and kicking off a grace period at the same time. multi-tasking icon behavior, we love to see it ✨

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🌸 NAME 🌸

start_poll_synchronize_srcu — bestie it provides a cookie AND starts the grace period. two jobs, one function, main character energy fr fr 🍪

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✨ SYNOPSIS ✨

unsigned long start_poll_synchronize_srcu (struct srcu_struct *ssp );

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🎀 ARGUMENTS 🎀

• ssp — the srcu_struct you want the cookie for. that's it. that's the whole argument. she's low maintenance 💅

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🦋 DESCRIPTION 🦋

ngl this one's actually kinda elegant. so: this function returns a cookie — and you can pass that cookie to poll_state_synchronize_srcu, which will return true if a full grace period has elapsed in the meantime. so you get the cookie now, you check it later, and it tells you if the grace period already happened. convenient much?? 🙈

and here's the part that makes her different from get_state_synchronize_srcu — this function also ensures that any needed SRCU grace period will be started. so she's not just handing you a cookie and walking away, she's also making sure the grace period gets going. proactive queen 👑

but listen, bestie, nothing's free — this convenience does come at a cost in terms of CPU overhead. so like… she's doing more work, and you're paying for it in cycles. worth it? that's your call, iykyk 💀

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👑 SEE ALSO 👑

the kernel file lives at ./kernel/rcu/srcutree.c, and here's the whole friend group 🫶

• init_srcu_struct_generic(9)
• init_srcu_struct_fast(9)
• init_srcu_struct_fast_updown(9)
• cleanup_srcu_struct(9)
• call_srcu(9)
• synchronize_srcu_expedited(9)
• synchronize_srcu(9)
• get_state_synchronize_srcu(9)
• poll_state_synchronize_srcu(9)
• srcu_barrier(9)
• srcu_expedite_current(9)
• srcu_batches_completed(9)

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🌈 that's the whole page, no cap! source: ./kernel/rcu, dated October 2026, and the page is start_poll_synchronize_srcu(9) — go forth and cookie responsibly, bestie 💜🎀