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author | Valentin Popov <valentin@popov.link> | 2024-07-19 15:37:58 +0300 |
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committer | Valentin Popov <valentin@popov.link> | 2024-07-19 15:37:58 +0300 |
commit | a990de90fe41456a23e58bd087d2f107d321f3a1 (patch) | |
tree | 15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/crossbeam-utils/src/sync/once_lock.rs | |
parent | 3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff) | |
download | fparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz fparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.zip |
Deleted vendor folder
Diffstat (limited to 'vendor/crossbeam-utils/src/sync/once_lock.rs')
-rw-r--r-- | vendor/crossbeam-utils/src/sync/once_lock.rs | 88 |
1 files changed, 0 insertions, 88 deletions
diff --git a/vendor/crossbeam-utils/src/sync/once_lock.rs b/vendor/crossbeam-utils/src/sync/once_lock.rs deleted file mode 100644 index e057aca..0000000 --- a/vendor/crossbeam-utils/src/sync/once_lock.rs +++ /dev/null @@ -1,88 +0,0 @@ -// Based on unstable std::sync::OnceLock. -// -// Source: https://github.com/rust-lang/rust/blob/8e9c93df464b7ada3fc7a1c8ccddd9dcb24ee0a0/library/std/src/sync/once_lock.rs - -use core::cell::UnsafeCell; -use core::mem::MaybeUninit; -use std::sync::Once; - -pub(crate) struct OnceLock<T> { - once: Once, - value: UnsafeCell<MaybeUninit<T>>, - // Unlike std::sync::OnceLock, we don't need PhantomData here because - // we don't use #[may_dangle]. -} - -unsafe impl<T: Sync + Send> Sync for OnceLock<T> {} -unsafe impl<T: Send> Send for OnceLock<T> {} - -impl<T> OnceLock<T> { - /// Creates a new empty cell. - #[must_use] - pub(crate) const fn new() -> Self { - Self { - once: Once::new(), - value: UnsafeCell::new(MaybeUninit::uninit()), - } - } - - /// Gets the contents of the cell, initializing it with `f` if the cell - /// was empty. - /// - /// Many threads may call `get_or_init` concurrently with different - /// initializing functions, but it is guaranteed that only one function - /// will be executed. - /// - /// # Panics - /// - /// If `f` panics, the panic is propagated to the caller, and the cell - /// remains uninitialized. - /// - /// It is an error to reentrantly initialize the cell from `f`. The - /// exact outcome is unspecified. Current implementation deadlocks, but - /// this may be changed to a panic in the future. - pub(crate) fn get_or_init<F>(&self, f: F) -> &T - where - F: FnOnce() -> T, - { - // Fast path check - if self.once.is_completed() { - // SAFETY: The inner value has been initialized - return unsafe { self.get_unchecked() }; - } - self.initialize(f); - - // SAFETY: The inner value has been initialized - unsafe { self.get_unchecked() } - } - - #[cold] - fn initialize<F>(&self, f: F) - where - F: FnOnce() -> T, - { - let slot = self.value.get(); - - self.once.call_once(|| { - let value = f(); - unsafe { slot.write(MaybeUninit::new(value)) } - }); - } - - /// # Safety - /// - /// The value must be initialized - unsafe fn get_unchecked(&self) -> &T { - debug_assert!(self.once.is_completed()); - &*self.value.get().cast::<T>() - } -} - -impl<T> Drop for OnceLock<T> { - fn drop(&mut self) { - if self.once.is_completed() { - // SAFETY: The inner value has been initialized - unsafe { (*self.value.get()).assume_init_drop() }; - } - } -} |