1 files changed, 0 insertions, 112 deletions
diff --git a/vendor/crossbeam-utils/src/atomic/seq_lock.rs b/vendor/crossbeam-utils/src/atomic/seq_lock.rs
deleted file mode 100644
index ff8defd..0000000
--- a/vendor/crossbeam-utils/src/atomic/seq_lock.rs
+++ /dev/null
@@ -1,112 +0,0 @@
-use core::mem;
-use core::sync::atomic::{self, AtomicUsize, Ordering};
-
-use crate::Backoff;
-
-/// A simple stamped lock.
-pub(crate) struct SeqLock {
-    /// The current state of the lock.
-    ///
-    /// All bits except the least significant one hold the current stamp. When locked, the state
-    /// equals 1 and doesn't contain a valid stamp.
-    state: AtomicUsize,
-}
-
-impl SeqLock {
-    pub(crate) const fn new() -> Self {
-        Self {
-            state: AtomicUsize::new(0),
-        }
-    }
-
-    /// If not locked, returns the current stamp.
-    ///
-    /// This method should be called before optimistic reads.
-    #[inline]
-    pub(crate) fn optimistic_read(&self) -> Option<usize> {
-        let state = self.state.load(Ordering::Acquire);
-        if state == 1 {
-            None
-        } else {
-            Some(state)
-        }
-    }
-
-    /// Returns `true` if the current stamp is equal to `stamp`.
-    ///
-    /// This method should be called after optimistic reads to check whether they are valid. The
-    /// argument `stamp` should correspond to the one returned by method `optimistic_read`.
-    #[inline]
-    pub(crate) fn validate_read(&self, stamp: usize) -> bool {
-        atomic::fence(Ordering::Acquire);
-        self.state.load(Ordering::Relaxed) == stamp
-    }
-
-    /// Grabs the lock for writing.
-    #[inline]
-    pub(crate) fn write(&'static self) -> SeqLockWriteGuard {
-        let backoff = Backoff::new();
-        loop {
-            let previous = self.state.swap(1, Ordering::Acquire);
-
-            if previous != 1 {
-                atomic::fence(Ordering::Release);
-
-                return SeqLockWriteGuard {
-                    lock: self,
-                    state: previous,
-                };
-            }
-
-            backoff.snooze();
-        }
-    }
-}
-
-/// An RAII guard that releases the lock and increments the stamp when dropped.
-pub(crate) struct SeqLockWriteGuard {
-    /// The parent lock.
-    lock: &'static SeqLock,
-
-    /// The stamp before locking.
-    state: usize,
-}
-
-impl SeqLockWriteGuard {
-    /// Releases the lock without incrementing the stamp.
-    #[inline]
-    pub(crate) fn abort(self) {
-        self.lock.state.store(self.state, Ordering::Release);
-
-        // We specifically don't want to call drop(), since that's
-        // what increments the stamp.
-        mem::forget(self);
-    }
-}
-
-impl Drop for SeqLockWriteGuard {
-    #[inline]
-    fn drop(&mut self) {
-        // Release the lock and increment the stamp.
-        self.lock
-            .state
-            .store(self.state.wrapping_add(2), Ordering::Release);
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::SeqLock;
-
-    #[test]
-    fn test_abort() {
-        static LK: SeqLock = SeqLock::new();
-        let before = LK.optimistic_read().unwrap();
-        {
-            let guard = LK.write();
-            guard.abort();
-        }
-        let after = LK.optimistic_read().unwrap();
-        assert_eq!(before, after, "aborted write does not update the stamp");
-    }
-}