esp32-nimble 0.12.0

A wrapper for the ESP32 NimBLE Bluetooth stack.
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use alloc::sync::{Arc, Weak};
use core::{
    cell::UnsafeCell,
    ops::{Deref, DerefMut},
};

pub struct ArcUnsafeCell<T: ?Sized> {
    value: Arc<UnsafeCell<T>>,
}

impl<T> ArcUnsafeCell<T> {
    #[inline(always)]
    pub(crate) fn new(value: T) -> Self {
        Self {
            value: Arc::new(UnsafeCell::new(value)),
        }
    }

    pub fn downgrade(this: &Self) -> WeakUnsafeCell<T> {
        WeakUnsafeCell {
            value: Arc::downgrade(&this.value),
        }
    }
}

impl<T: ?Sized> Clone for ArcUnsafeCell<T> {
    #[inline]
    fn clone(&self) -> Self {
        Self {
            value: self.value.clone(),
        }
    }
}

impl<T: ?Sized> Deref for ArcUnsafeCell<T> {
    type Target = T;

    #[inline]
    fn deref(&self) -> &T {
        unsafe { &*self.value.get() }
    }
}

impl<T: ?Sized> DerefMut for ArcUnsafeCell<T> {
    #[inline]
    fn deref_mut(&mut self) -> &mut T {
        unsafe { &mut *self.value.get() }
    }
}

pub struct WeakUnsafeCell<T: ?Sized> {
    pub value: Weak<UnsafeCell<T>>,
}

impl<T> WeakUnsafeCell<T> {
    pub fn upgrade(&self) -> Option<ArcUnsafeCell<T>> {
        self.value.upgrade().map(|x| ArcUnsafeCell { value: x })
    }
}

impl<T: ?Sized> Clone for WeakUnsafeCell<T> {
    #[inline]
    fn clone(&self) -> Self {
        Self {
            value: self.value.clone(),
        }
    }
}