Enum memmap2::Advice

#[repr(i32)]
pub enum Advice {
    Normal = 0,
    Random = 1,
    Sequential = 2,
    WillNeed = 3,
    ZeroWiredPages = 6,
}

Values supported by Mmap::advise and MmapMut::advise functions.

See madvise() map page.

Variants

Normal = 0

MADV_NORMAL

No special treatment. This is the default.

Random = 1

MADV_RANDOM

Expect page references in random order. (Hence, read ahead may be less useful than normally.)

Sequential = 2

MADV_SEQUENTIAL

Expect page references in sequential order. (Hence, pages in the given range can be aggressively read ahead, and may be freed soon after they are accessed.)

WillNeed = 3

MADV_WILLNEED

Expect access in the near future. (Hence, it might be a good idea to read some pages ahead.)

ZeroWiredPages = 6

MADV_ZERO_WIRED_PAGES - Darwin only

Indicates that the application would like the wired pages in this address range to be zeroed out if the address range is deallocated without first unwiring the pages (i.e. a munmap(2) without a preceding munlock(2) or the application quits). This is used with madvise() system call.

Trait Implementations

impl Clone for Advice

fn clone(&self) -> Advice

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Advice

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

Formats the value using the given formatter.

impl Hash for Advice

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Advice

fn eq(&self, other: &Advice) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Advice

impl Eq for Advice

impl StructuralEq for Advice

impl StructuralPartialEq for Advice