1 pub use ::alloc::sync::Arc;
2 use core::ops::{Deref, DerefMut};
3 use core::time::Duration;
4 use core::cell::{RefCell, Ref, RefMut};
5 use super::{LockTestExt, LockHeldState};
7 pub type LockResult<Guard> = Result<Guard, ()>;
12 pub fn new() -> Condvar {
16 pub fn wait<'a, T>(&'a self, guard: MutexGuard<'a, T>) -> LockResult<MutexGuard<'a, T>> {
21 pub fn wait_timeout<'a, T>(&'a self, guard: MutexGuard<'a, T>, _dur: Duration) -> LockResult<(MutexGuard<'a, T>, ())> {
25 pub fn notify_all(&self) {}
28 pub struct Mutex<T: ?Sized> {
32 #[must_use = "if unused the Mutex will immediately unlock"]
33 pub struct MutexGuard<'a, T: ?Sized + 'a> {
37 impl<T: ?Sized> Deref for MutexGuard<'_, T> {
40 fn deref(&self) -> &T {
45 impl<T: ?Sized> DerefMut for MutexGuard<'_, T> {
46 fn deref_mut(&mut self) -> &mut T {
52 pub fn new(inner: T) -> Mutex<T> {
53 Mutex { inner: RefCell::new(inner) }
56 pub fn lock<'a>(&'a self) -> LockResult<MutexGuard<'a, T>> {
57 Ok(MutexGuard { lock: self.inner.borrow_mut() })
60 pub fn try_lock<'a>(&'a self) -> LockResult<MutexGuard<'a, T>> {
61 Ok(MutexGuard { lock: self.inner.borrow_mut() })
64 pub fn into_inner(self) -> LockResult<T> {
65 Ok(self.inner.into_inner())
69 impl<'a, T: 'a> LockTestExt<'a> for Mutex<T> {
71 fn held_by_thread(&self) -> LockHeldState {
72 if self.lock().is_err() { return LockHeldState::HeldByThread; }
73 else { return LockHeldState::NotHeldByThread; }
75 type ExclLock = MutexGuard<'a, T>;
77 fn unsafe_well_ordered_double_lock_self(&'a self) -> MutexGuard<T> { self.lock().unwrap() }
80 pub struct RwLock<T: ?Sized> {
84 pub struct RwLockReadGuard<'a, T: ?Sized + 'a> {
88 pub struct RwLockWriteGuard<'a, T: ?Sized + 'a> {
92 impl<T: ?Sized> Deref for RwLockReadGuard<'_, T> {
95 fn deref(&self) -> &T {
100 impl<T: ?Sized> Deref for RwLockWriteGuard<'_, T> {
103 fn deref(&self) -> &T {
108 impl<T: ?Sized> DerefMut for RwLockWriteGuard<'_, T> {
109 fn deref_mut(&mut self) -> &mut T {
110 self.lock.deref_mut()
115 pub fn new(inner: T) -> RwLock<T> {
116 RwLock { inner: RefCell::new(inner) }
119 pub fn read<'a>(&'a self) -> LockResult<RwLockReadGuard<'a, T>> {
120 Ok(RwLockReadGuard { lock: self.inner.borrow() })
123 pub fn write<'a>(&'a self) -> LockResult<RwLockWriteGuard<'a, T>> {
124 Ok(RwLockWriteGuard { lock: self.inner.borrow_mut() })
127 pub fn try_write<'a>(&'a self) -> LockResult<RwLockWriteGuard<'a, T>> {
128 match self.inner.try_borrow_mut() {
129 Ok(lock) => Ok(RwLockWriteGuard { lock }),
135 impl<'a, T: 'a> LockTestExt<'a> for RwLock<T> {
137 fn held_by_thread(&self) -> LockHeldState {
138 if self.write().is_err() { return LockHeldState::HeldByThread; }
139 else { return LockHeldState::NotHeldByThread; }
141 type ExclLock = RwLockWriteGuard<'a, T>;
143 fn unsafe_well_ordered_double_lock_self(&'a self) -> RwLockWriteGuard<T> { self.write().unwrap() }
146 pub type FairRwLock<T> = RwLock<T>;