Struct MvccHeader

Source

pub struct MvccHeader {
    pub magic: u64,
    pub version: u32,
    pub page_size: u32,
    pub num_readers: u32,
    pub current_epoch: AtomicU64,
    pub current_ts: AtomicU64,
    pub writer_lock: AtomicU32,
    pub commits_since_gc: AtomicU64,
    /* private fields */
}

Expand description

MVCC metadata file header

Fields§

§magic: u64

Magic bytes for validation

§version: u32

Format version

§page_size: u32

Page size

§num_readers: u32

Number of reader slots

§current_epoch: AtomicU64

Current epoch (incremented on recovery/GC)

§current_ts: AtomicU64

Current HLC timestamp

§writer_lock: AtomicU32

Writer lock (0 = free, pid = locked)

§commits_since_gc: AtomicU64

Number of commits since last GC

Implementations§

Source §

impl MvccHeader

Source

pub fn new() -> Self

Create new header with default values

Source

pub fn validate(&self) -> Result<()>

Validate header

Trait Implementations§

Source §

impl Debug for MvccHeader

Source §

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

Formats the value using the given formatter. Read more

Source §

impl Default for MvccHeader

Source §

fn default() -> Self

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

Auto Trait Implementations§

§

impl UnwindSafe for MvccHeader

Blanket Implementations§

Source §

impl<T> Any for T
where T: 'static + ?Sized,

Source §

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

Source §

impl<T> Borrow<T> for T
where T: ?Sized,

Source §

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

Source §

impl<T> BorrowMut<T> for T
where T: ?Sized,

Source §

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

Source §

impl<T> From<T> for T

Source §

fn from(t: T) -> T

Returns the argument unchanged.

Source §

impl<T> Instrument for T

Source §

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

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

Source §

fn in_current_span(self) -> Instrumented<Self>

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

Source §

impl<T, U> Into for T
where U: From<T>,

Source §

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Source §

impl<T> IntoEither for T

Source §

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

Source §

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

Source §