get_state_synchronize_rcu(9)

💖 get_state_synchronize_rcu 💖

okay so bestie, this page is from the Kernel API Manual, and we're talking about get_state_synchronize_rcu. it's giving snapshot the current RCU state energy, and honestly? iconic little helper. 🫶

✨ NAME ✨

get_state_synchronize_rcu — Snapshot current RCU state

✨ SYNOPSIS ✨

unsigned long get_state_synchronize_rcu (void );

🌸 ARGUMENTS 🌸

• void — no arguments. zero. none. the void is voiding. 💀

🦋 DESCRIPTION 🦋

so this function returns a cookie (unsigned long), and that cookie is used by a later call to cond_synchronize_rcu or poll_state_synchronize_rcu to determine whether or not a full grace period has elapsed in the meantime. that's the whole bit, and it ate. ✨

lowkey important: the cookie is for a later call to one of those two functions. no cap, that's the vibe. 🍓

🌈 SEE ALSO 🌈

the kernel file is ./kernel/rcu/tree.c, and here's the whole squad:

• rcu_softirq_qs(9)
• rcu_watching_snap_stopped_since(9)
• rcu_is_cpu_rrupt_from_idle(9)
• rcu_irq_exit_check_preempt(9)
• __rcu_irq_enter_check_tick(9)
• rcu_is_watching(9)
• rcu_set_gpwrap_lag(9)
• call_rcu_hurry(9)
• call_rcu(9)
• synchronize_rcu(9)
• get_completed_synchronize_rcu_full(9)
• get_state_synchronize_rcu_full(9)
• start_poll_synchronize_rcu(9)
• start_poll_synchronize_rcu_full(9)
• poll_state_synchronize_rcu(9)
• poll_state_synchronize_rcu_full(9)
• cond_synchronize_rcu(9)
• cond_synchronize_rcu_full(9)
• rcu_barrier(9)
• rcu_barrier_throttled(9)

mwah 💋 that's the page, bestie. born from ./kernel/rcu, dated October 2026, and filed under the Kernel API Manual as get_state_synchronize_rcu(9). go be iconic with your grace periods. 🧚💜