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use crate::rt;
use std::ops;
use std::sync::{LockResult, TryLockError, TryLockResult};
#[derive(Debug)]
pub struct Mutex<T> {
object: rt::Mutex,
data: std::sync::Mutex<T>,
}
#[derive(Debug)]
pub struct MutexGuard<'a, T> {
lock: &'a Mutex<T>,
data: Option<std::sync::MutexGuard<'a, T>>,
}
impl<T> Mutex<T> {
pub fn new(data: T) -> Mutex<T> {
Mutex {
data: std::sync::Mutex::new(data),
object: rt::Mutex::new(true),
}
}
}
impl<T> Mutex<T> {
pub fn lock(&self) -> LockResult<MutexGuard<'_, T>> {
self.object.acquire_lock();
Ok(MutexGuard {
lock: self,
data: Some(self.data.lock().unwrap()),
})
}
pub fn try_lock(&self) -> TryLockResult<MutexGuard<'_, T>> {
if self.object.try_acquire_lock() {
Ok(MutexGuard {
lock: self,
data: Some(self.data.lock().unwrap()),
})
} else {
Err(TryLockError::WouldBlock)
}
}
pub fn into_inner(self) -> LockResult<T> {
Ok(self.data.into_inner().unwrap())
}
}
impl<T: ?Sized + Default> Default for Mutex<T> {
fn default() -> Self {
Self::new(Default::default())
}
}
impl<T> From<T> for Mutex<T> {
fn from(t: T) -> Self {
Self::new(t)
}
}
impl<'a, T: 'a> MutexGuard<'a, T> {
pub(super) fn unborrow(&mut self) {
self.data = None;
}
pub(super) fn reborrow(&mut self) {
self.data = Some(self.lock.data.lock().unwrap());
}
pub(super) fn rt(&self) -> &rt::Mutex {
&self.lock.object
}
}
impl<'a, T> ops::Deref for MutexGuard<'a, T> {
type Target = T;
fn deref(&self) -> &T {
self.data.as_ref().unwrap().deref()
}
}
impl<'a, T> ops::DerefMut for MutexGuard<'a, T> {
fn deref_mut(&mut self) -> &mut T {
self.data.as_mut().unwrap().deref_mut()
}
}
impl<'a, T: 'a> Drop for MutexGuard<'a, T> {
fn drop(&mut self) {
self.data = None;
self.lock.object.release_lock();
}
}