Enum TreeServerSendPreference

pub enum TreeServerSendPreference {
    Frozen {
        on_failure: Box<TreeServerSendPreference>,
    },
    Live,
    DeepCopy,
}

A setting for the fuchsia.inspect.Tree server that indicates how the server should send the Inspector’s VMO. For fallible methods of sending, a fallback is also set.

Variants

Frozen

Frozen denotes sending a copy-on-write VMO. on_failure refers to failure behavior, as not all VMOs can be frozen. In particular, freezing a VMO requires writing to it, so if an Inspector is created with a read-only VMO, freezing will fail.

Failure behavior should be one of Live or DeepCopy.

Frozen { on_failure: Live } is the default value of TreeServerSendPreference.

Fields

on_failure: Box<TreeServerSendPreference>

Live

Live denotes sending a live handle to the VMO.

A client might want this behavior if they have time sensitive writes to the VMO, because copy-on-write behavior causes the initial write to a page to be around 1% slower.

DeepCopy

DeepCopy will send a private copy of the VMO. This should probably not be a client’s first choice, as Frozen(DeepCopy) will provide the same semantic behavior while possibly avoiding an expensive copy.

A client might want this behavior if they have time sensitive writes to the VMO, because copy-on-write behavior causes the initial write to a page to be around 1% slower.

Implementations

impl TreeServerSendPreference

pub fn frozen_or(failure_mode: TreeServerSendPreference) -> Self

Create a new TreeServerSendPreference that sends a frozen/copy-on-write VMO of the tree, falling back to the specified failure_mode if a frozen VMO cannot be provided.

Arguments

• failure_mode - Fallback behavior to use if freezing the Inspect VMO fails.

Trait Implementations

impl Clone for TreeServerSendPreference

fn clone(&self) -> TreeServerSendPreference

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Default for TreeServerSendPreference

fn default() -> Self

Returns the “default value” for a type.