Struct BitmapAlloc

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pub struct BitmapAlloc { /* private fields */ }
Expand description

Free space bitmap-based external memory allocator.

See the module-level documentation for more.

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impl BitmapAlloc

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pub fn new(size: usize) -> Self

Construct a BitmapAlloc.

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pub fn alloc(&mut self, size: usize) -> Option<(BitmapAllocRegion, usize)>

Alias of alloc_next.

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pub fn alloc_next(&mut self, size: usize) -> Option<(BitmapAllocRegion, usize)>

Allocate a region of the size size using a Next-Fit strategy. The time complexity is linear to the size of the heap.

Returns a handle of the allocated region and its offset if the allocation succeeds. Returns None otherwise.

size must not be zero.

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pub fn alloc_first(&mut self, size: usize) -> Option<(BitmapAllocRegion, usize)>

Allocate a region of the size size using a First-Fit strategy. The time complexity is linear to the size of the heap.

Returns a handle of the allocated region and its offset if the allocation succeeds. Returns None otherwise.

size must not be zero.

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pub fn dealloc_relaxed(&mut self, r: BitmapAllocRegion)

Deallocate the specified region.

r must originate from the same instance of BitmapAlloc. Otherwise, BitmapAlloc enters an inconsistent state and possibly panics, but does not cause an undefined behavior.

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impl Clone for BitmapAlloc

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fn clone(&self) -> BitmapAlloc

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for BitmapAlloc

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.