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#[repr(usize)]
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
pub(crate) enum State {
/// Task is currently idle
Idle = 0,
/// Task is currently running
Running = 1,
/// Task is currently running, but has been notified that it must run again.
Notified = 2,
/// Task has been scheduled
Scheduled = 3,
/// Task is complete
Complete = 4,
/// Task was aborted because the thread pool has been shut down
Aborted = 5,
}
// ===== impl State =====
impl State {
/// Returns the initial task state.
///
/// Tasks start in the scheduled state as they are immediately scheduled on
/// creation.
pub fn new() -> State {
State::Scheduled
}
pub fn stub() -> State {
State::Idle
}
}
impl From<usize> for State {
fn from(src: usize) -> Self {
use self::State::*;
debug_assert!(
src >= Idle as usize && src <= Aborted as usize,
"actual={}",
src
);
unsafe { ::std::mem::transmute(src) }
}
}
impl From<State> for usize {
fn from(src: State) -> Self {
src as usize
}
}
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