Enum SyncPolicy 

pub enum SyncPolicy {
    Always,
    Interval(Duration),
    Never,
}

写入后何时调用 fsync。

Variants

Always

每次写入都 fsync，最安全也最慢。

Interval(Duration)

距上次 fsync 超过这个间隔时，在下一次写入后 fsync。进程崩溃不丢数据（已写入内核）， 断电最多丢这个间隔内的写入。

Never

交给操作系统。

Trait Implementations

impl Clone for SyncPolicy

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SyncPolicy

impl Debug for SyncPolicy

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

Formats the value using the given formatter.

impl Eq for SyncPolicy

impl PartialEq for SyncPolicy

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SyncPolicy