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use std::cell::UnsafeCell;
use std::ops::{Deref, DerefMut};
use raw::Mutex as RawMutex;
pub struct Mutex<T> {
mutex: RawMutex,
data: UnsafeCell<T>,
}
unsafe impl<T: Send> Send for Mutex<T> { }
unsafe impl<T: Send> Sync for Mutex<T> { }
impl<T> Mutex<T> {
pub fn new(t: T) -> Mutex<T> {
Mutex {
mutex: RawMutex::new(),
data: UnsafeCell::new(t),
}
}
pub fn lock(&self) -> MutexGuard<T> {
self.mutex.acquire();
MutexGuard { mutex: &self }
}
pub fn try_lock(&self) -> Option<MutexGuard<T>> {
if self.mutex.try_acquire() {
Some(MutexGuard { mutex: &self })
} else {
None
}
}
}
impl<T: Default> Default for Mutex<T> {
fn default() -> Mutex<T> {
Mutex::new(Default::default())
}
}
#[must_use]
pub struct MutexGuard<'a, T: 'a> {
mutex: &'a Mutex<T>
}
impl<'a, T: 'a> Drop for MutexGuard<'a, T> {
fn drop(&mut self) {
self.mutex.mutex.release();
}
}
impl<'a, T: 'a> Deref for MutexGuard<'a, T> {
type Target = T;
fn deref(&self) -> &T {
unsafe { &*self.mutex.data.get() }
}
}
impl<'a, T: 'a> DerefMut for MutexGuard<'a, T> {
fn deref_mut(&mut self) -> &mut T {
unsafe { &mut *self.mutex.data.get() }
}
}