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#![doc = include_str!("../README.md")]
use std::sync::{
atomic::{AtomicBool, Ordering::SeqCst},
Arc,
};
mod parallel_map;
pub use self::parallel_map::ParallelMap;
mod readahead;
pub use self::readahead::Readahead;
mod parallel_filter;
pub use self::parallel_filter::ParallelFilter;
use lazy_static::lazy_static;
type DefaultThreadPool = rusty_pool::ThreadPool;
lazy_static! {
static ref DEFAULT_POOL: rusty_pool::ThreadPool = rusty_pool::ThreadPool::new(
num_cpus::get(),
rusty_pool::MAX_SIZE,
std::time::Duration::from_secs(1)
);
}
pub trait ThreadPool {
type JoinHandle;
fn submit<F>(&mut self, f: F) -> Self::JoinHandle
where
F: FnOnce() + Send + 'static;
}
impl ThreadPool for rusty_pool::ThreadPool {
type JoinHandle = rusty_pool::JoinHandle<()>;
fn submit<F>(&mut self, f: F) -> Self::JoinHandle
where
F: FnOnce() + Send + 'static,
{
self.evaluate(f)
}
}
pub trait IteratorExt {
fn parallel_map<F, O>(self, f: F) -> ParallelMap<Self, O, F, DefaultThreadPool>
where
Self: Sized,
Self: Iterator,
F: FnMut(Self::Item) -> O;
fn parallel_filter<F>(self, f: F) -> ParallelFilter<Self, DefaultThreadPool>
where
Self: Sized,
Self: Iterator + Send,
F: FnMut(&Self::Item) -> bool + Send + 'static + Clone,
Self::Item: Send + 'static;
fn readahead(self, buffer_size: usize) -> Readahead<Self, DefaultThreadPool>
where
Self: Iterator,
Self: Sized,
Self: Send + 'static,
Self::Item: Send + 'static;
}
impl<I> IteratorExt for I
where
I: Iterator,
{
fn parallel_map<F, O>(self, f: F) -> ParallelMap<Self, O, F, DefaultThreadPool>
where
Self: Sized,
Self: Iterator,
F: FnMut(I::Item) -> O,
{
ParallelMap::new(self, DEFAULT_POOL.clone(), f)
}
fn readahead(self, buffer_size: usize) -> Readahead<Self, DefaultThreadPool>
where
Self: Iterator,
Self: Sized,
Self: Send + 'static,
<Self as Iterator>::Item: Send + 'static,
{
Readahead::new(self, buffer_size, DEFAULT_POOL.clone())
}
fn parallel_filter<F>(self, f: F) -> ParallelFilter<Self, DefaultThreadPool>
where
Self: Sized,
Self: Iterator + Send,
F: FnMut(&I::Item) -> bool + Send + 'static + Clone,
<Self as Iterator>::Item: Send + 'static,
{
ParallelFilter::new(self, DEFAULT_POOL.clone(), f)
}
}
struct DropIndicator {
canceled: bool,
indicator: Arc<AtomicBool>,
}
impl DropIndicator {
fn new(indicator: Arc<AtomicBool>) -> Self {
Self {
canceled: false,
indicator,
}
}
fn cancel(mut self) {
self.canceled = true;
}
}
impl Drop for DropIndicator {
fn drop(&mut self) {
if !self.canceled {
self.indicator.store(true, SeqCst);
}
}
}
#[cfg(test)]
mod tests;