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use crate::sys::locks as imp;
/// An OS-based mutual exclusion lock.
///
/// This mutex cleans up its resources in its `Drop` implementation, may safely
/// be moved (when not borrowed), and does not cause UB when used reentrantly.
///
/// This mutex does not implement poisoning.
///
/// This is either a wrapper around `LazyBox<imp::Mutex>` or `imp::Mutex`,
/// depending on the platform. It is boxed on platforms where `imp::Mutex` may
/// not be moved.
pub struct MovableMutex(imp::MovableMutex);
unsafe impl Sync for MovableMutex {}
impl MovableMutex {
/// Creates a new mutex.
#[inline]
#[rustc_const_stable(feature = "const_locks", since = "1.63.0")]
pub const fn new() -> Self {
Self(imp::MovableMutex::new())
}
pub(super) fn raw(&self) -> &imp::Mutex {
&self.0
}
/// Locks the mutex blocking the current thread until it is available.
#[inline]
pub fn raw_lock(&self) {
unsafe { self.0.lock() }
}
/// Attempts to lock the mutex without blocking, returning whether it was
/// successfully acquired or not.
#[inline]
pub fn try_lock(&self) -> bool {
unsafe { self.0.try_lock() }
}
/// Unlocks the mutex.
///
/// Behavior is undefined if the current thread does not actually hold the
/// mutex.
#[inline]
pub unsafe fn raw_unlock(&self) {
self.0.unlock()
}
}
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