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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
pub(crate) use self::lock::Lock;
#[cfg(threadsafe)]
mod lock {
use std::sync::{Arc, Mutex, MutexGuard};
/// Thread safe lock: just wraps a `Mutex`.
pub(crate) struct Lock<A> {
lock: Arc<Mutex<A>>,
}
impl<A> Lock<A> {
pub(crate) fn new(value: A) -> Self {
Lock {
lock: Arc::new(Mutex::new(value)),
}
}
#[inline]
pub(crate) fn lock(&mut self) -> Option<MutexGuard<'_, A>> {
self.lock.lock().ok()
}
}
impl<A> Clone for Lock<A> {
fn clone(&self) -> Self {
Lock {
lock: self.lock.clone(),
}
}
}
}
#[cfg(not(threadsafe))]
mod lock {
use std::cell::{RefCell, RefMut};
use std::rc::Rc;
/// Single threaded lock: a `RefCell` so we should safely panic if somehow
/// trying to access the stored data twice from the same thread.
pub(crate) struct Lock<A> {
lock: Rc<RefCell<A>>,
}
impl<A> Lock<A> {
pub(crate) fn new(value: A) -> Self {
Lock {
lock: Rc::new(RefCell::new(value)),
}
}
#[inline]
pub(crate) fn lock(&mut self) -> Option<RefMut<'_, A>> {
self.lock.try_borrow_mut().ok()
}
}
impl<A> Clone for Lock<A> {
fn clone(&self) -> Self {
Lock {
lock: self.lock.clone(),
}
}
}
}
|
