Struct swap::file::FilePageStates

struct FilePageStates {
    first_idx_file_freed: Option<usize>,
    states: Vec<FilePageState>,
}

Fields

first_idx_file_freed: Option<usize>

Freed pages on the swap file are managed in a free list. first_freed_idx_file points to the first page index in the list.

states: Vec<FilePageState>

Implementations

impl FilePageStates

fn new(capacity: usize) -> Self

fn len(&self) -> usize

fn free(&mut self, idx_file: usize)

Free a page on swap file.

fn allocate(&mut self, idx_page: usize) -> usize

Allocates a file page on the swap file.

This returns the index of the allocated file page.

This reuses freed file pages first. If the free list is empty, this allocates new pages in the file.

fn find_present_pages_range( &self, idx_file: usize, page_states: &[PageState], max_pages: usize, consecutive: bool ) -> Option<(Range<usize>, usize)>

Find the index range of file pages that are all present.

This returns the pair of range of file page indexes and the index of the corresponding first page.

Returns None if no pages after idx_file are present.

Arguments

• idx_file - The first index to start searching from.
• page_states - The page states
• max_pages - The maximum number of pages to search.
• consecutive - If true, the pages must have consecutive idx_page values.

Trait Implementations

impl Debug for FilePageStates

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

Formats the value using the given formatter.