vls-core 0.14.0

A library for implementing a Lightning signer, which externalizes and secures cryptographic operations.
Documentation 
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pub use ::alloc::sync::{Arc, Weak};
use core::cell::{Ref, RefCell, RefMut};
use core::ops::{Deref, DerefMut};
use core::time::Duration;

pub type LockResult<Guard> = Result<Guard, ()>;

pub struct Condvar {}

impl Condvar {
    pub fn new() -> Condvar {
        Condvar {}
    }

    pub fn wait<'a, T>(&'a self, guard: MutexGuard<'a, T>) -> LockResult<MutexGuard<'a, T>> {
        Ok(guard)
    }

    #[allow(unused)]
    pub fn wait_timeout<'a, T>(
        &'a self,
        guard: MutexGuard<'a, T>,
        _dur: Duration,
    ) -> LockResult<(MutexGuard<'a, T>, ())> {
        Ok((guard, ()))
    }

    pub fn notify_all(&self) {}
}

pub struct Mutex<T: ?Sized> {
    inner: RefCell<T>,
}

#[must_use = "if unused the Mutex will immediately unlock"]
pub struct MutexGuard<'a, T: ?Sized + 'a> {
    lock: RefMut<'a, T>,
}

impl<T: ?Sized> Deref for MutexGuard<'_, T> {
    type Target = T;

    fn deref(&self) -> &T {
        &self.lock.deref()
    }
}

impl<T: ?Sized> DerefMut for MutexGuard<'_, T> {
    fn deref_mut(&mut self) -> &mut T {
        self.lock.deref_mut()
    }
}

impl<T> Mutex<T> {
    pub fn new(inner: T) -> Mutex<T> {
        Mutex { inner: RefCell::new(inner) }
    }

    pub fn lock<'a>(&'a self) -> LockResult<MutexGuard<'a, T>> {
        Ok(MutexGuard { lock: self.inner.borrow_mut() })
    }

    pub fn try_lock<'a>(&'a self) -> LockResult<MutexGuard<'a, T>> {
        Ok(MutexGuard { lock: self.inner.borrow_mut() })
    }
}

pub struct RwLock<T: ?Sized> {
    inner: RefCell<T>,
}

pub struct RwLockReadGuard<'a, T: ?Sized + 'a> {
    lock: Ref<'a, T>,
}

pub struct RwLockWriteGuard<'a, T: ?Sized + 'a> {
    lock: RefMut<'a, T>,
}

impl<T: ?Sized> Deref for RwLockReadGuard<'_, T> {
    type Target = T;

    fn deref(&self) -> &T {
        &self.lock.deref()
    }
}

impl<T: ?Sized> Deref for RwLockWriteGuard<'_, T> {
    type Target = T;

    fn deref(&self) -> &T {
        &self.lock.deref()
    }
}

impl<T: ?Sized> DerefMut for RwLockWriteGuard<'_, T> {
    fn deref_mut(&mut self) -> &mut T {
        self.lock.deref_mut()
    }
}

impl<T> RwLock<T> {
    pub fn new(inner: T) -> RwLock<T> {
        RwLock { inner: RefCell::new(inner) }
    }

    pub fn read<'a>(&'a self) -> LockResult<RwLockReadGuard<'a, T>> {
        Ok(RwLockReadGuard { lock: self.inner.borrow() })
    }

    pub fn write<'a>(&'a self) -> LockResult<RwLockWriteGuard<'a, T>> {
        Ok(RwLockWriteGuard { lock: self.inner.borrow_mut() })
    }

    pub fn try_write<'a>(&'a self) -> LockResult<RwLockWriteGuard<'a, T>> {
        // There is no try, grasshopper - only used for tests and expected to fail
        Err(())
    }
}