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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253// SPDX-License-Identifier: GPL-2.0
//! RCU support.//!//! C header: [`include/linux/rcupdate.h`](srctree/include/linux/rcupdate.h)
use crate::{bindings, types::NotThreadSafe};
/// Evidence that the RCU read side lock is held on the current thread/CPU.////// The type is explicitly not `Send` because this property is per-thread/CPU.////// # Invariants////// The RCU read side lock is actually held while instances of this guard exist.pub struct Guard(NotThreadSafe);
impl Guard { /// Acquires the RCU read side lock and returns a guard. #[inline] pub fn new() -> Self { // SAFETY: An FFI call with no additional requirements. unsafe { bindings::rcu_read_lock() }; // INVARIANT: The RCU read side lock was just acquired above. Self(NotThreadSafe) }
/// Explicitly releases the RCU read side lock. #[inline] pub fn unlock(self) {}}
impl Default for Guard { #[inline] fn default() -> Self { Self::new() }}
impl Drop for Guard { #[inline] fn drop(&mut self) { // SAFETY: By the type invariants, the RCU read side is locked, so it is ok to unlock it. unsafe { bindings::rcu_read_unlock() }; }}
/// Acquires the RCU read side lock.#[inline]pub fn read_lock() -> Guard { Guard::new()}