Struct MmapPagerSource

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pub struct MmapPagerSource { /* private fields */ }

Expand description

Memory-mapped PagerSource — faster random access than seek+read.

Requires the mmap feature. The mmap is created read-only and is safe to share across threads. OS-level demand paging may still cause page faults on access, but the read_bytes_at implementation is zero-copy after the initial map.

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impl MmapPagerSource

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pub fn open(path: impl AsRef<Path>) -> Result<Self, RuntimeError>

Open and memory-map the file at path.

Trait Implementations§

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impl PagerSource for MmapPagerSource

Available on crate feature mmap only.

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fn read_bytes_at(&self, offset: u64, out: &mut [u8]) -> Result<(), RuntimeError>

Read exactly out.len() bytes starting at offset into out. Read more

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fn total_size_bytes(&self) -> u64

Total size of the backing store in bytes.

Auto Trait Implementations§

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impl UnwindSafe for MmapPagerSource

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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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impl<T, U> Into 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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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