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use std::fmt;
use std::ops;
const READABLE: usize = 0b0_01;
const WRITABLE: usize = 0b0_10;
const READ_CLOSED: usize = 0b0_0100;
const WRITE_CLOSED: usize = 0b0_1000;
/// A set of readiness event kinds.
///
/// `Ready` is set of operation descriptors indicating which kind of an
/// operation is ready to be performed.
///
/// This struct only represents portable event kinds. Portable events are
/// events that can be raised on any platform while guaranteeing no false
/// positives.
#[derive(Clone, Copy, PartialEq, PartialOrd)]
pub(crate) struct Ready(usize);
impl Ready {
/// Returns the empty `Ready` set.
pub(crate) const EMPTY: Ready = Ready(0);
/// Returns a `Ready` representing readable readiness.
pub(crate) const READABLE: Ready = Ready(READABLE);
/// Returns a `Ready` representing writable readiness.
pub(crate) const WRITABLE: Ready = Ready(WRITABLE);
/// Returns a `Ready` representing read closed readiness.
pub(crate) const READ_CLOSED: Ready = Ready(READ_CLOSED);
/// Returns a `Ready` representing write closed readiness.
pub(crate) const WRITE_CLOSED: Ready = Ready(WRITE_CLOSED);
/// Returns a `Ready` representing readiness for all operations.
pub(crate) const ALL: Ready = Ready(READABLE | WRITABLE | READ_CLOSED | WRITE_CLOSED);
pub(crate) fn from_mio(event: &mio::event::Event) -> Ready {
let mut ready = Ready::EMPTY;
if event.is_readable() {
ready |= Ready::READABLE;
}
if event.is_writable() {
ready |= Ready::WRITABLE;
}
if event.is_read_closed() {
ready |= Ready::READ_CLOSED;
}
if event.is_write_closed() {
ready |= Ready::WRITE_CLOSED;
}
ready
}
/// Returns true if `Ready` is the empty set
pub(crate) fn is_empty(self) -> bool {
self == Ready::EMPTY
}
/// Returns true if the value includes readable readiness
pub(crate) fn is_readable(self) -> bool {
self.contains(Ready::READABLE) || self.is_read_closed()
}
/// Returns true if the value includes writable readiness
pub(crate) fn is_writable(self) -> bool {
self.contains(Ready::WRITABLE) || self.is_write_closed()
}
/// Returns true if the value includes read closed readiness
pub(crate) fn is_read_closed(self) -> bool {
self.contains(Ready::READ_CLOSED)
}
/// Returns true if the value includes write closed readiness
pub(crate) fn is_write_closed(self) -> bool {
self.contains(Ready::WRITE_CLOSED)
}
/// Returns true if `self` is a superset of `other`.
///
/// `other` may represent more than one readiness operations, in which case
/// the function only returns true if `self` contains all readiness
/// specified in `other`.
pub(crate) fn contains<T: Into<Self>>(self, other: T) -> bool {
let other = other.into();
(self & other) == other
}
/// Create a `Ready` instance using the given `usize` representation.
///
/// The `usize` representation must have been obtained from a call to
/// `Readiness::as_usize`.
///
/// This function is mainly provided to allow the caller to get a
/// readiness value from an `AtomicUsize`.
pub(crate) fn from_usize(val: usize) -> Ready {
Ready(val & Ready::ALL.as_usize())
}
/// Returns a `usize` representation of the `Ready` value.
///
/// This function is mainly provided to allow the caller to store a
/// readiness value in an `AtomicUsize`.
pub(crate) fn as_usize(self) -> usize {
self.0
}
}
cfg_io_readiness! {
use crate::io::Interest;
impl Ready {
pub(crate) fn from_interest(interest: Interest) -> Ready {
let mut ready = Ready::EMPTY;
if interest.is_readable() {
ready |= Ready::READABLE;
ready |= Ready::READ_CLOSED;
}
if interest.is_writable() {
ready |= Ready::WRITABLE;
ready |= Ready::WRITE_CLOSED;
}
ready
}
pub(crate) fn intersection(self, interest: Interest) -> Ready {
Ready(self.0 & Ready::from_interest(interest).0)
}
pub(crate) fn satisfies(self, interest: Interest) -> bool {
self.0 & Ready::from_interest(interest).0 != 0
}
}
}
impl<T: Into<Ready>> ops::BitOr<T> for Ready {
type Output = Ready;
#[inline]
fn bitor(self, other: T) -> Ready {
Ready(self.0 | other.into().0)
}
}
impl<T: Into<Ready>> ops::BitOrAssign<T> for Ready {
#[inline]
fn bitor_assign(&mut self, other: T) {
self.0 |= other.into().0;
}
}
impl<T: Into<Ready>> ops::BitAnd<T> for Ready {
type Output = Ready;
#[inline]
fn bitand(self, other: T) -> Ready {
Ready(self.0 & other.into().0)
}
}
impl<T: Into<Ready>> ops::Sub<T> for Ready {
type Output = Ready;
#[inline]
fn sub(self, other: T) -> Ready {
Ready(self.0 & !other.into().0)
}
}
impl fmt::Debug for Ready {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt.debug_struct("Ready")
.field("is_readable", &self.is_readable())
.field("is_writable", &self.is_writable())
.field("is_read_closed", &self.is_read_closed())
.field("is_write_closed", &self.is_write_closed())
.finish()
}
}
|
