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//! Blocking Mutex lock
/// Multithreaded blocking Mutex
pub mod sync {
crate::cfg_loom! {
use std::sync::{Mutex as Inner, MutexGuard as InnerGuard};
}
use std::{
fmt,
ops::{Deref, DerefMut},
};
/// A multithreaded Mutex based on [`std::sync::Mutex`].
pub struct Mutex<T: ?Sized>(Inner<T>);
impl<T: ?Sized + fmt::Debug> fmt::Debug for Mutex<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
impl<T> Mutex<T> {
/// Creates a new mutex in an unlocked state ready for use.
#[cfg(not(loom))]
pub const fn new(val: T) -> Self {
Self(Inner::new(val))
}
/// Creates a new mutex in an unlocked state ready for use.
///
/// This `new` is not `const` due to loom not supporting it.
#[cfg(loom)]
pub fn new(val: T) -> Self {
Self(Inner::new(val))
}
/// Get the inner [`std::sync::Mutex`].
pub fn into_inner(self) -> Inner<T> {
self.0
}
}
impl<T: ?Sized> Mutex<T> {
/// Acquires a mutex, blocking the current thread until it is able to do
/// so.
///
/// See [`std::sync::Mutex::lock`] for detail.
///
/// # Panics
///
/// This function might panic when called if the lock is already held by
/// the current thread or is poisoned (some thread panicked while
/// holding the lock).
pub fn lock(&self) -> MutexGuard<'_, T> {
MutexGuard(self.0.lock().unwrap())
}
}
/// An RAII implementation of a "scoped lock" of a mutex. When this
/// structure is dropped (falls out of scope), the lock will be
/// unlocked.
pub struct MutexGuard<'a, T: ?Sized>(InnerGuard<'a, T>);
impl<T: ?Sized + fmt::Debug> fmt::Debug for MutexGuard<'_, T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
impl<'a, T: ?Sized> MutexGuard<'a, T> {
/// Get the inner [`std::sync::MutexGuard`].
pub fn into_inner(self) -> InnerGuard<'a, T> {
self.0
}
}
impl<'a, T> Deref for MutexGuard<'a, T> {
type Target = T;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<'a, T> DerefMut for MutexGuard<'a, T> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl<T: Send> crate::AssertMt for Mutex<T> {}
}
/// Singlethreaded blocking Mutex
pub mod unsync {
use std::{
cell::{RefCell as Inner, RefMut as InnerGuard},
fmt,
ops::{Deref, DerefMut},
};
/// A singlethreaded Mutex based on [`std::cell::RefCell`].
pub struct Mutex<T: ?Sized>(Inner<T>);
impl<T: ?Sized + fmt::Debug> fmt::Debug for Mutex<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
impl<T> Mutex<T> {
/// Creates a new mutex in an unlocked state ready for use.
pub const fn new(val: T) -> Self {
Self(Inner::new(val))
}
/// Get the inner [`std::cell::RefCell`].
pub fn into_inner(self) -> Inner<T> {
self.0
}
}
impl<T: ?Sized> Mutex<T> {
/// Acquires a mutex.
///
/// See [`std::cell::RefCell::borrow_mut`] for detail.
///
/// # Panics
///
/// Panics if the value is currently borrowed.
pub fn lock(&self) -> MutexGuard<'_, T> {
MutexGuard(self.0.borrow_mut())
}
}
/// An RAII implementation of a "scoped lock" of a mutex. When this
/// structure is dropped (falls out of scope), the lock will be
/// unlocked.
pub struct MutexGuard<'a, T: ?Sized>(InnerGuard<'a, T>);
impl<T: ?Sized + fmt::Debug> fmt::Debug for MutexGuard<'_, T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
impl<'a, T: ?Sized> MutexGuard<'a, T> {
/// Get the inner [`std::cell::RefMut`].
pub fn into_inner(self) -> InnerGuard<'a, T> {
self.0
}
}
impl<'a, T> Deref for MutexGuard<'a, T> {
type Target = T;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<'a, T> DerefMut for MutexGuard<'a, T> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
}