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FutexScope

Enum FutexScope 

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pub enum FutexScope {
    Private,
    Shared,
}
Expand description

Portée d’une opération futex(2) : process-privée ou partagée.

Le noyau distingue deux familles de futex via le drapeau FUTEX_PRIVATE_FLAG :

  • FutexScope::Private (FUTEX_*_PRIVATE) — le cas courant, et le défaut (Default). Le futex n’est partagé qu’entre les threads d’un même processus ; le noyau saute la résolution d’adresse inter-process (clé futex basée sur l’adresse virtuelle, pas sur l’inode du mapping) — c’est strictement plus rapide. C’est la portée d’un Mutex/Condvar intra-processus.
  • FutexScope::Shared — le mot futex vit dans de la mémoire partagée (mmap(MAP_SHARED), segment SysV…) et synchronise des processus distincts. Le noyau identifie le futex par l’inode + offset du mapping sous-jacent.

Exposer la portée comme un type (et non un drapeau d’op brut) respecte ADR-021 §3 : futex_wait/futex_wake restent une fonction typée par opération, la portée est un paramètre typé orthogonal.

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Private

Futex process-privé (FUTEX_*_PRIVATE) — défaut, cas courant.

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Shared

Futex partagé entre processus (mémoire MAP_SHARED).

Trait Implementations§

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impl Clone for FutexScope

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fn clone(&self) -> FutexScope

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 FutexScope

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impl Debug for FutexScope

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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 Default for FutexScope

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fn default() -> FutexScope

Returns the “default value” for a type. Read more
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impl Eq for FutexScope

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impl Hash for FutexScope

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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 FutexScope

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fn eq(&self, other: &FutexScope) -> 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 FutexScope

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.