all: split reusable components into workspace crates

src/utils/free_list.rs

@@ -1,95 +0,0 @@
-#[cfg(test)]
-mod tests;
-
-use {
-    crate::utils::ptr_ext::MutPtrExt,
-    std::{
-        array,
-        cell::UnsafeCell,
-        fmt::{Debug, Formatter},
-        marker::PhantomData,
-    },
-};
-
-type Seg = usize;
-const SEG_SIZE: usize = size_of::<Seg>() * 8;
-
-pub struct FreeList<T, const N: usize> {
-    levels: UnsafeCell<[Vec<Seg>; N]>,
-    _phantom: PhantomData<T>,
-}
-
-impl<T, const N: usize> Default for FreeList<T, N> {
-    fn default() -> Self {
-        Self {
-            levels: UnsafeCell::new(array::from_fn(|_| Vec::new())),
-            _phantom: Default::default(),
-        }
-    }
-}
-
-impl<T, const N: usize> Debug for FreeList<T, N> {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("FreeList")
-            .field("levels", self.get())
-            .finish()
-    }
-}
-
-impl<T, const N: usize> FreeList<T, N> {
-    fn get(&self) -> &mut [Vec<Seg>; N] {
-        unsafe { self.levels.get().deref_mut() }
-    }
-
-    #[cfg_attr(not(test), expect(dead_code))]
-    pub fn release(&self, n: T)
-    where
-        T: Into<u32>,
-    {
-        let mut ext = n.into() as usize;
-        let mut int;
-        let levels = self.get();
-        assert!(ext / SEG_SIZE < levels[0].len());
-        for level in self.get() {
-            int = ext % SEG_SIZE;
-            ext /= SEG_SIZE;
-            unsafe {
-                *level.get_unchecked_mut(ext) |= 1 << int;
-            }
-        }
-    }
-
-    #[cfg_attr(not(test), expect(dead_code))]
-    pub fn acquire(&self) -> T
-    where
-        u32: Into<T>,
-    {
-        let mut ext = 'last: {
-            let level = &mut self.get()[N - 1];
-            for (idx, &seg) in level.iter().enumerate() {
-                if seg != 0 {
-                    break 'last idx;
-                }
-            }
-            level.len()
-        };
-        for level in self.get().iter_mut().rev() {
-            if ext == level.len() {
-                level.push(!0);
-            }
-            let seg = unsafe { level.get_unchecked(ext) };
-            ext = SEG_SIZE * ext + seg.trailing_zeros() as usize;
-        }
-        let id = ext as u32;
-        for level in self.get().iter_mut() {
-            let int = ext % SEG_SIZE;
-            ext /= SEG_SIZE;
-            let seg = unsafe { level.get_unchecked_mut(ext) };
-            *seg &= !(1 << int);
-            if *seg != 0 {
-                break;
-            }
-        }
-        id.into()
-    }
-}