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/*
* Copyright (c) 2006-2025, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2025-10-10 foxglove RT-Thread Mutex implementation
*/
use crate::api::*;
use crate::{panic::panic_on_atomic_context, RTTError};
use alloc::fmt;
pub use alloc::sync::{Arc, Weak};
use core::cell::UnsafeCell;
use core::ops::{Deref, DerefMut};
use core::sync::atomic::*;
const RT_WAITING_FOREVER: isize = -1;
unsafe impl<T: Send, M: RawMutexOps + Sized> Send for Mutex<T, M> {}
unsafe impl<T: Send, M: RawMutexOps + Sized> Sync for Mutex<T, M> {}
pub struct Mutex<T: ?Sized, M = SleepMutex>
where
M: RawMutexOps + Sized,
{
mutex: M,
data: UnsafeCell<T>,
}
/* Impl for Default Mutex<M = SleepMutex, NAME = UnnamedObj> */
impl<T> Mutex<T> {
pub fn new(t: T) -> Result<Self, RTTError> {
Ok(Mutex {
mutex: SleepMutex::create("Unnamed")?,
data: UnsafeCell::new(t),
})
}
pub fn new_with_name(t: T, name: &str) -> Result<Self, RTTError> {
Ok(Mutex {
mutex: SleepMutex::create(name)?,
data: UnsafeCell::new(t),
})
}
pub fn try_lock(&self, max_wait: isize) -> Result<MutexGuard<'_, SleepMutex, T>, RTTError> {
self.mutex.take(max_wait)?;
Ok(MutexGuard {
__mutex: &self.mutex,
__data: &self.data,
})
}
pub fn lock(&self) -> Result<MutexGuard<'_, SleepMutex, T>, RTTError> {
self.mutex.take(RT_WAITING_FOREVER)?;
Ok(MutexGuard {
__mutex: &self.mutex,
__data: &self.data,
})
}
}
/* Impl for all Mutex */
impl<T, M: RawMutexOps> Mutex<T, M> {
pub fn spec_new(t: T) -> Result<Self, RTTError> {
Ok(Mutex {
mutex: M::create("Unnamed")?,
data: UnsafeCell::new(t),
})
}
pub fn spec_new_with_name(t: T, name: &str) -> Result<Self, RTTError> {
Ok(Mutex {
mutex: M::create(name)?,
data: UnsafeCell::new(t),
})
}
pub fn spec_try_lock(&self, max_wait: isize) -> Result<MutexGuard<'_, M, T>, RTTError> {
self.mutex.take(max_wait)?;
Ok(MutexGuard {
__mutex: &self.mutex,
__data: &self.data,
})
}
pub fn spec_lock(&self) -> Result<MutexGuard<'_, M, T>, RTTError> {
self.mutex.take(RT_WAITING_FOREVER)?;
Ok(MutexGuard {
__mutex: &self.mutex,
__data: &self.data,
})
}
}
impl<T: ?Sized> fmt::Debug for Mutex<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Mutex address: {:?}", self.mutex)
}
}
pub struct MutexGuard<'a, M: RawMutexOps + 'a, T: ?Sized + 'a> {
__mutex: &'a M,
__data: &'a UnsafeCell<T>,
}
impl<'mutex, M: RawMutexOps, T: ?Sized> Deref for MutexGuard<'mutex, M, T> {
type Target = T;
fn deref(&self) -> &T {
unsafe { &*self.__data.get() }
}
}
impl<'mutex, M: RawMutexOps, T: ?Sized> DerefMut for MutexGuard<'mutex, M, T> {
fn deref_mut(&mut self) -> &mut T {
unsafe { &mut *self.__data.get() }
}
}
impl<'a, M: RawMutexOps, T: ?Sized> Drop for MutexGuard<'a, M, T> {
fn drop(&mut self) {
self.__mutex.release();
}
}
pub type CommonMutex = SleepMutex;
pub struct SleepMutex(APIRawMutex);
impl fmt::Debug for SleepMutex {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}", self.0)
}
}
pub struct AtomicMutex(UnsafeCell<InterruptFlag>, AtomicBool);
pub trait RawMutexOps: Sized {
fn create(name: &str) -> Result<Self, RTTError>;
fn take(&self, max_wait: isize) -> Result<(), RTTError>;
fn release(&self);
fn drop(&mut self);
}
impl RawMutexOps for AtomicMutex {
fn create(_name: &str) -> Result<Self, RTTError> {
Ok(AtomicMutex {
0: UnsafeCell::new(INTERRUPT_FLAG_INIT),
1: AtomicBool::new(false),
})
}
fn take(&self, max_wait: isize) -> Result<(), RTTError> {
let f;
unsafe {
f = self.0.get();
*f = interrupt_disable();
}
let ret = if max_wait == RT_WAITING_FOREVER {
while self
.1
.compare_exchange_weak(false, true, Ordering::Acquire, Ordering::Relaxed)
.is_err()
{
while self.1.load(Ordering::Relaxed) {}
}
Ok(())
} else {
if self
.1
.compare_exchange_weak(false, true, Ordering::Acquire, Ordering::Relaxed)
.is_ok()
{
Ok(())
} else {
unsafe {
interrupt_enable(*f);
}
Err(RTTError::MutexTakeTimeout)
}
};
return ret;
}
fn release(&self) {
self.1.store(false, Ordering::Release);
let f;
unsafe {
f = self.0.get();
interrupt_enable(*f);
}
}
fn drop(&mut self) {}
}
impl RawMutexOps for SleepMutex {
fn create(name: &str) -> Result<Self, RTTError> {
panic_on_atomic_context("create");
mutex_create(name)
.ok_or(RTTError::OutOfMemory)
.map(|m| SleepMutex(m))
}
fn take(&self, max_wait: isize) -> Result<(), RTTError> {
panic_on_atomic_context("take");
let ret = mutex_take(self.0, max_wait);
if !is_eok(ret) {
return Err(RTTError::MutexTakeTimeout);
}
Ok(())
}
fn release(&self) {
panic_on_atomic_context("release");
mutex_release(self.0);
}
fn drop(&mut self) {
panic_on_atomic_context("drop");
mutex_delete(self.0);
}
}
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