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//! Linux `futex`.
//!
//! # Safety
//!
//! Futex is a very low-level mechanism for implementing concurrency
//! primitives.
#![allow(unsafe_code)]
use crate::thread::Timespec;
use crate::{backend, io};
pub use backend::thread::futex::{FutexFlags, FutexOperation};
/// `futex(uaddr, op, val, utime, uaddr2, val3)`
///
/// # References
/// - [Linux `futex` system call]
/// - [Linux `futex` feature]
///
/// # Safety
///
/// This is a very low-level feature for implementing synchronization
/// primitives. See the references links above.
///
/// [Linux `futex` system call]: https://man7.org/linux/man-pages/man2/futex.2.html
/// [Linux `futex` feature]: https://man7.org/linux/man-pages/man7/futex.7.html
#[inline]
pub unsafe fn futex(
uaddr: *mut u32,
op: FutexOperation,
flags: FutexFlags,
val: u32,
utime: *const Timespec,
uaddr2: *mut u32,
val3: u32,
) -> io::Result<usize> {
backend::thread::syscalls::futex(uaddr, op, flags, val, utime, uaddr2, val3)
}
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