mirror of
https://gitee.com/bianbu-linux/linux-6.6
synced 2025-04-24 14:07:52 -04:00
76d4bd591e
They are generic Rust implementations of a lock and a lock guard that contain code that is common to all locks. Different backends will be introduced in subsequent commits. Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com> Suggested-by: Gary Guo <gary@garyguo.net> Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com> Link: https://lore.kernel.org/r/20230411054543.21278-2-wedsonaf@gmail.com [ Fixed typo. ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
55 lines
1.4 KiB
Rust
55 lines
1.4 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
//! Synchronisation primitives.
|
|
//!
|
|
//! This module contains the kernel APIs related to synchronisation that have been ported or
|
|
//! wrapped for usage by Rust code in the kernel.
|
|
|
|
use crate::types::Opaque;
|
|
|
|
mod arc;
|
|
pub mod lock;
|
|
|
|
pub use arc::{Arc, ArcBorrow, UniqueArc};
|
|
|
|
/// Represents a lockdep class. It's a wrapper around C's `lock_class_key`.
|
|
#[repr(transparent)]
|
|
pub struct LockClassKey(Opaque<bindings::lock_class_key>);
|
|
|
|
// SAFETY: `bindings::lock_class_key` is designed to be used concurrently from multiple threads and
|
|
// provides its own synchronization.
|
|
unsafe impl Sync for LockClassKey {}
|
|
|
|
impl LockClassKey {
|
|
/// Creates a new lock class key.
|
|
pub const fn new() -> Self {
|
|
Self(Opaque::uninit())
|
|
}
|
|
|
|
pub(crate) fn as_ptr(&self) -> *mut bindings::lock_class_key {
|
|
self.0.get()
|
|
}
|
|
}
|
|
|
|
/// Defines a new static lock class and returns a pointer to it.
|
|
#[doc(hidden)]
|
|
#[macro_export]
|
|
macro_rules! static_lock_class {
|
|
() => {{
|
|
static CLASS: $crate::sync::LockClassKey = $crate::sync::LockClassKey::new();
|
|
&CLASS
|
|
}};
|
|
}
|
|
|
|
/// Returns the given string, if one is provided, otherwise generates one based on the source code
|
|
/// location.
|
|
#[doc(hidden)]
|
|
#[macro_export]
|
|
macro_rules! optional_name {
|
|
() => {
|
|
$crate::c_str!(::core::concat!(::core::file!(), ":", ::core::line!()))
|
|
};
|
|
($name:literal) => {
|
|
$crate::c_str!($name)
|
|
};
|
|
}
|