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FadviseAdvice

Enum FadviseAdvice 

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#[repr(i32)]
pub enum FadviseAdvice { Normal = 0, Random = 1, Sequential = 2, WillNeed = 3, DontNeed = 4, NoReuse = 5, }
Expand description

Conseil d’accès pour posix_fadvise(2) (POSIX_FADV_*).

Distinct de crate::mem::MadviseAdvice : l’espace de valeurs de posix_fadvise (fichier) n’est pas celui de madvise (mémoire), même si la spec io_uring 2a les nomme tous deux « advice ». Sur les cibles tier-1 d’Air (x86_64/aarch64), les constantes valent 0..=5.

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Normal = 0

POSIX_FADV_NORMAL : aucun conseil particulier.

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Random = 1

POSIX_FADV_RANDOM : accès aléatoire (désactive le préfetch).

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Sequential = 2

POSIX_FADV_SEQUENTIAL : accès séquentiel (préfetch agressif).

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WillNeed = 3

POSIX_FADV_WILLNEED : données bientôt nécessaires (préfetch).

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DontNeed = 4

POSIX_FADV_DONTNEED : données plus nécessaires (libère le cache).

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NoReuse = 5

POSIX_FADV_NOREUSE : données accédées une seule fois.

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impl FadviseAdvice

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pub const fn as_raw(self) -> i32

Valeur kernel (POSIX_FADV_*) du conseil.

Trait Implementations§

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impl Clone for FadviseAdvice

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fn clone(&self) -> FadviseAdvice

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Copy for FadviseAdvice

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impl Debug for FadviseAdvice

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

Formats the value using the given formatter. Read more
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impl Eq for FadviseAdvice

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impl Hash for FadviseAdvice

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

Feeds this value into the given Hasher. Read more
1.3.0 · Source§

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

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for FadviseAdvice

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

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

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

Inequality operator !=. Read more
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impl StructuralPartialEq for FadviseAdvice

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.