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use lock_api::RawMutex as Unused0;
use parking_lot::RawMutex;
pub trait Lock<'a> {
type Output;
unsafe fn lock_info(&self) -> LockInfo<'_>;
unsafe fn lock_unchecked(self) -> Self::Output;
}
pub struct LockInfo<'a> {
pub id: usize,
pub guard: RawLockGuard<'a>,
}
pub enum Never {}
pub enum RawLockGuard<'a> {
RawMutex(&'a RawMutex),
#[doc(hidden)]
__NonExhaustive(Never),
}
impl<'a> RawLockGuard<'a> {
pub fn lock(&self) {
match *self {
RawLockGuard::RawMutex(ref raw) => raw.lock(),
RawLockGuard::__NonExhaustive(ref n) => match *n {},
}
}
pub fn try_lock(&self) -> bool {
match *self {
RawLockGuard::RawMutex(ref raw) => raw.try_lock(),
RawLockGuard::__NonExhaustive(ref n) => match *n {},
}
}
}
pub struct Mut<T>(T);
impl<'a, T> Lock<'a> for Mut<T>
where
T: WriteLock<'a>,
{
type Output = <T as WriteLock<'a>>::Output;
unsafe fn lock_info(&self) -> LockInfo<'_> {
<T as WriteLock<'a>>::lock_info(&self.0)
}
unsafe fn lock_unchecked(self) -> Self::Output {
<T as WriteLock<'a>>::lock_unchecked(self.0)
}
}
pub struct Ref<T>(T);
impl<'a, T> Lock<'a> for Ref<T>
where
T: ReadLock<'a>,
{
type Output = T::Output;
unsafe fn lock_info(&self) -> LockInfo<'_> {
self.0.lock_info()
}
unsafe fn lock_unchecked(self) -> Self::Output {
self.0.lock_unchecked()
}
}
pub trait ReadLock<'a> {
type Output;
fn read(self) -> Ref<Self>
where
Self: Sized,
{
Ref(self)
}
unsafe fn lock_info(&self) -> LockInfo<'_>;
unsafe fn lock_unchecked(self) -> Self::Output;
}
pub trait WriteLock<'a> {
type Output;
fn write(self) -> Mut<Self>
where
Self: Sized,
{
Mut(self)
}
unsafe fn lock_info(&self) -> LockInfo<'_>;
unsafe fn lock_unchecked(self) -> <Self as WriteLock<'a>>::Output;
}