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use crate::loom::sync::Arc;
use crate::runtime::thread_pool::slice;
use crate::task::JoinHandle;
use std::fmt;
use std::future::Future;
/// Submit futures to the associated thread pool for execution.
///
/// A `Spawner` instance is a handle to a single thread pool, allowing the owner
/// of the handle to spawn futures onto the thread pool.
///
/// The `Spawner` handle is *only* used for spawning new futures. It does not
/// impact the lifecycle of the thread pool in any way. The thread pool may
/// shutdown while there are outstanding `Spawner` instances.
///
/// `Spawner` instances are obtained by calling [`ThreadPool::spawner`].
///
/// [`ThreadPool::spawner`]: struct.ThreadPool.html#method.spawner
#[derive(Clone)]
pub(crate) struct Spawner {
workers: Arc<slice::Set>,
}
impl Spawner {
pub(super) fn new(workers: Arc<slice::Set>) -> Spawner {
Spawner { workers }
}
/// Spawn a future onto the thread pool
pub(crate) fn spawn<F>(&self, future: F) -> JoinHandle<F::Output>
where
F: Future + Send + 'static,
F::Output: Send + 'static,
{
self.workers.spawn_typed(future)
}
/// Enter the executor context
pub(crate) fn enter<F, R>(&self, f: F) -> R
where
F: FnOnce() -> R,
{
crate::runtime::global::with_thread_pool(self, f)
}
/// Reference to the worker set. Used by `ThreadPool` to initiate shutdown.
pub(super) fn workers(&self) -> &slice::Set {
&*self.workers
}
}
impl fmt::Debug for Spawner {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt.debug_struct("Spawner").finish()
}
}
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