Struct CowTable 

pub struct CowTable {
    pub entries: BTreeMap<usize, CowEntry>,
}

Table of COW-shared frames keyed by virtual page address.

Fields

entries: BTreeMap<usize, CowEntry>

Map from virtual page address to COW entry.

Implementations

impl CowTable

pub fn new() -> Self

Create an empty COW table.

pub fn mark_cow(&mut self, vaddr: usize, frame: FrameNumber)

Register a frame as COW-shared with initial ref_count = 2.

pub fn release(&self, vaddr: usize) -> bool

Decrement ref count for a COW page; returns true if this was the last reference (frame can be freed).

pub fn is_cow(&self, vaddr: usize) -> bool

Check whether an address is COW-tracked.

Trait Implementations

impl Default for CowTable

Available on crate feature alloc only.

fn default() -> Self

Returns the “default value” for a type.