dope-runtime 0.20.0

Thread-per-core execution and process lifecycle for dope
Documentation 
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use std::mem;

use dope_core::{driver, driver::result::poll};
use turn::{modes, scope::Core};

use crate::executor::drive::{self, clock, turn};

#[must_use]
pub(crate) enum Status {
    Active,
    Shutdown,
}

#[must_use]
pub(crate) struct Parked<'turn, 'd, M> {
    core: Core<'turn, 'd, M>,
    events: poll::Drain,
    status: Status,
}

impl<'turn, 'd, M> Parked<'turn, 'd, M>
where
    M: modes::Mode<'d>,
{
    pub(super) const fn new(core: Core<'turn, 'd, M>, events: poll::Drain, status: Status) -> Self {
        Self {
            core,
            events,
            status,
        }
    }

    pub(crate) const fn status(&self) -> &Status {
        &self.status
    }

    pub(crate) fn sync(mut self) -> Result<turn::Sync<turn::Idle<'turn, 'd, M>>, poll::Error> {
        if !self.core.pending.is_none() {
            return Ok(turn::Sync::Again);
        }
        if matches!(self.events, poll::Drain::Pending) {
            let _ = driver::Context::commit(&mut self.core.driver, self.core.turn.reactor())?;
            return Ok(turn::Sync::Again);
        }
        Ok(turn::Sync::Idle(turn::Idle::new(self.core)))
    }

    /// Resolves idle work and waits until the next turn unless the loop completes.
    /// Returns `true` when complete; `false` requests another poll.
    pub(crate) fn resolve<C>(
        self,
        source: C,
        resolve: impl FnOnce(
            turn::Idle<'turn, 'd, M>,
        ) -> Result<turn::Resolved<'turn, 'd, M>, drive::Error>,
    ) -> Result<bool, drive::Error>
    where
        C: clock::Time,
    {
        let idle = match self.sync()? {
            turn::Sync::Again => return Ok(false),
            turn::Sync::Idle(idle) => idle,
        };
        match resolve(idle)? {
            turn::Resolved::Again => Ok(false),
            turn::Resolved::Done => Ok(true),
            turn::Resolved::Wait(idle, state) => {
                let span = idle.timeout(state, source);
                idle.wait(source.limit(span))?;
                Ok(false)
            }
        }
    }
}

const _: () = {
    assert!(mem::size_of::<Status>() == mem::size_of::<bool>());
    assert!(mem::align_of::<Status>() == mem::align_of::<bool>());
    assert!(
        mem::size_of::<self::Parked<'_, '_, modes::Boot>>()
            == mem::size_of::<turn::Polled<'_, '_, modes::Boot>>()
    );
    assert!(
        mem::align_of::<self::Parked<'_, '_, modes::Boot>>()
            == mem::align_of::<turn::Polled<'_, '_, modes::Boot>>()
    );
};