generic_container/impls/
arc_rwlock.rs

1use core::convert::Infallible;
2use alloc::sync::Arc;
3use std::sync::{RwLock, RwLockReadGuard, RwLockWriteGuard};
4
5use crate::container_traits::{
6    FragileContainer, FragileMutContainer, FragileTryContainer, FragileTryMutContainer,
7};
8use super::HandlePoisonedResult as _;
9
10
11impl<T: ?Sized> FragileTryContainer<T> for Arc<RwLock<T>> {
12    type Ref<'a>  = RwLockReadGuard<'a, T> where T: 'a;
13    type RefError = Infallible;
14
15    #[inline]
16    fn new_container(t: T) -> Self where T: Sized {
17        Self::new(RwLock::new(t))
18    }
19
20    /// Attempt to retrieve the inner `T` from the container.
21    /// Behaves identically to [`Arc::into_inner`].
22    ///
23    /// Ignores any poison errors.
24    #[inline]
25    fn into_inner(self) -> Option<T> where T: Sized {
26        Self::into_inner(self)
27            .map(RwLock::into_inner)
28            .map(Result::ignore_poisoned)
29    }
30
31    /// Get immutable access to the inner `T`.
32    ///
33    /// Uses [`RwLock::read`], so this container is
34    /// [fragile](crate#fragility-potential-panics-or-deadlocks).
35    ///
36    /// # Panics and Deadlocks
37    /// Panics if a poison error is encountered, which can only occur if another thread has
38    /// already panicked.
39    ///
40    /// May also panic or deadlock if the contract of a fragile container is broken.
41    #[inline]
42    fn try_get_ref(&self) -> Result<Self::Ref<'_>, Self::RefError> {
43        Ok(self.read().panic_if_poisoned())
44    }
45}
46
47impl<T: ?Sized> FragileContainer<T> for Arc<RwLock<T>> {
48    /// Get immutable access to the inner `T`.
49    ///
50    /// Uses [`RwLock::read`], so this container is
51    /// [fragile](crate#fragility-potential-panics-or-deadlocks).
52    ///
53    /// # Panics and Deadlocks
54    /// Panics if a poison error is encountered, which can only occur if another thread has
55    /// already panicked.
56    ///
57    /// May also panic or deadlock if the contract of a fragile container is broken.
58    #[inline]
59    fn get_ref(&self) -> Self::Ref<'_> {
60        self.read().panic_if_poisoned()
61    }
62}
63
64impl<T: ?Sized> FragileTryMutContainer<T> for Arc<RwLock<T>> {
65    type RefMut<'a>  = RwLockWriteGuard<'a, T> where T: 'a;
66    type RefMutError = Infallible;
67
68    /// Get mutable access to the inner `T`.
69    ///
70    /// Uses [`RwLock::write`], so this container is
71    /// [fragile](crate#fragility-potential-panics-or-deadlocks).
72    ///
73    /// # Panics and Deadlocks
74    /// Panics if a poison error is encountered, which can only occur if another thread has
75    /// already panicked.
76    ///
77    /// May also panic or deadlock if the contract of a fragile container is broken.
78    #[inline]
79    fn try_get_mut(&mut self) -> Result<Self::RefMut<'_>, Self::RefMutError> {
80        Ok(self.write().panic_if_poisoned())
81    }
82}
83
84impl<T: ?Sized> FragileMutContainer<T> for Arc<RwLock<T>> {
85    /// Get mutable access to the inner `T`.
86    ///
87    /// Uses [`RwLock::write`], so this container is
88    /// [fragile](crate#fragility-potential-panics-or-deadlocks).
89    ///
90    /// # Panics and Deadlocks
91    /// Panics if a poison error is encountered, which can only occur if another thread has
92    /// already panicked.
93    ///
94    /// May also panic or deadlock if the contract of a fragile container is broken.
95    #[inline]
96    fn get_mut(&mut self) -> Self::RefMut<'_> {
97        self.write().panic_if_poisoned()
98    }
99}
generic_container/impls/arc_rwlock.rs

generic_container/impls/
arc_rwlock.rs
