Enum PortState

enum PortState {
    Empty(u8),
    EmptyNotReady,
    Occupied(u8),
    OccupiedNotReady,
}

PortState indicates the state of the port.

The initial PortState is EmptyNotReady (EmpNR). 9 PortStates are possible, and transition between the states are only possible by the following 3 groups of functions: handle_port_ready(R): guest notification of port ready to accept hot plug events. handle_plug_request(P) and handle_unplug_request(U): host initated requests. handle_plug_complete(PC) and handle_unplug_complete(UC): guest notification of event completion. When a port is not ready, PC and UC are not expected as no events are scheduled. The state transition is as follows: Emp0<-UC–Emp1<-PC–Emp2 | ^ \ ^ ^ ^ ^ | / P / P\ / P\ | | / \ \ | | /\ /\ \ | R U \ U \U \U | | / v / v\ v\ | | Occ0<-PC–Occ1<-UC–Occ2<-PC–Occ3 | | ^ | \ R | EmpNR<-P,U->OccNR |

Variants

Empty(u8)

Port is empty on crosvm. The state on the guest OS is n steps behind.

EmptyNotReady

Port is empty on crosvm. The port is not enabled on the guest OS yet.

Occupied(u8)

Port is occupied on crosvm. The state on the guest OS is n steps behind.

OccupiedNotReady

Port is occupied on crosvm. The port is not enabled on the guest OS yet.

Implementations

impl PortState

fn variant_order_index(&self) -> u8

Trait Implementations

impl Clone for PortState

fn clone(&self) -> PortState

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PortState

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

Formats the value using the given formatter.

impl Ord for PortState

Ordering on PortState defined by “most empty”.

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for PortState

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for PortState

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for PortState

impl Eq for PortState

impl StructuralPartialEq for PortState