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use crate::future::Future;
use crate::loom::sync::Arc;
use crate::runtime::scheduler::multi_thread::worker;
use crate::runtime::{
blocking, driver,
task::{self, JoinHandle},
};
use crate::util::RngSeedGenerator;
use std::fmt;
/// Handle to the multi thread scheduler
pub(crate) struct Handle {
/// Task spawner
pub(super) shared: worker::Shared,
/// Resource driver handles
pub(crate) driver: driver::Handle,
/// Blocking pool spawner
pub(crate) blocking_spawner: blocking::Spawner,
/// Current random number generator seed
pub(crate) seed_generator: RngSeedGenerator,
}
impl Handle {
/// Spawns a future onto the thread pool
pub(crate) fn spawn<F>(me: &Arc<Self>, future: F, id: task::Id) -> JoinHandle<F::Output>
where
F: crate::future::Future + Send + 'static,
F::Output: Send + 'static,
{
Self::bind_new_task(me, future, id)
}
pub(crate) fn shutdown(&self) {
self.close();
}
pub(super) fn bind_new_task<T>(me: &Arc<Self>, future: T, id: task::Id) -> JoinHandle<T::Output>
where
T: Future + Send + 'static,
T::Output: Send + 'static,
{
let (handle, notified) = me.shared.owned.bind(future, me.clone(), id);
if let Some(notified) = notified {
me.schedule_task(notified, false);
}
handle
}
}
cfg_metrics! {
use crate::runtime::{SchedulerMetrics, WorkerMetrics};
impl Handle {
pub(crate) fn num_workers(&self) -> usize {
self.shared.worker_metrics.len()
}
pub(crate) fn num_blocking_threads(&self) -> usize {
self.blocking_spawner.num_threads()
}
pub(crate) fn num_idle_blocking_threads(&self) -> usize {
self.blocking_spawner.num_idle_threads()
}
pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics {
&self.shared.scheduler_metrics
}
pub(crate) fn worker_metrics(&self, worker: usize) -> &WorkerMetrics {
&self.shared.worker_metrics[worker]
}
pub(crate) fn injection_queue_depth(&self) -> usize {
self.shared.injection_queue_depth()
}
pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize {
self.shared.worker_local_queue_depth(worker)
}
pub(crate) fn blocking_queue_depth(&self) -> usize {
self.blocking_spawner.queue_depth()
}
}
}
impl fmt::Debug for Handle {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt.debug_struct("multi_thread::Handle { ... }").finish()
}
}
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