From 1b6a04ca5504955c571d1c97504fb45ea0befee4 Mon Sep 17 00:00:00 2001
From: Valentin Popov <valentin@popov.link>
Date: Mon, 8 Jan 2024 01:21:28 +0400
Subject: Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>
---
 vendor/rustix/src/thread/futex.rs | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 vendor/rustix/src/thread/futex.rs

(limited to 'vendor/rustix/src/thread/futex.rs')

diff --git a/vendor/rustix/src/thread/futex.rs b/vendor/rustix/src/thread/futex.rs
new file mode 100644
index 0000000..47947c8
--- /dev/null
+++ b/vendor/rustix/src/thread/futex.rs
@@ -0,0 +1,38 @@
+//! 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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