MeiliSearch/milli/src/thread_pool_no_abort.rs

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use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Arc;
use rayon::{ThreadPool, ThreadPoolBuilder};
use thiserror::Error;
/// A rayon ThreadPool wrapper that can catch panics in the pool
/// and modifies the install function accordingly.
#[derive(Debug)]
pub struct ThreadPoolNoAbort {
thread_pool: ThreadPool,
/// Set to true if the thread pool catched a panic.
pool_catched_panic: Arc<AtomicBool>,
}
impl ThreadPoolNoAbort {
pub fn install<OP, R>(&self, op: OP) -> Result<R, PanicCatched>
where
OP: FnOnce() -> R + Send,
R: Send,
{
let output = self.thread_pool.install(op);
// While reseting the pool panic catcher we return an error if we catched one.
if self.pool_catched_panic.swap(false, Ordering::SeqCst) {
Err(PanicCatched)
} else {
Ok(output)
}
}
pub fn current_num_threads(&self) -> usize {
self.thread_pool.current_num_threads()
}
}
#[derive(Error, Debug)]
#[error("A panic occured. Read the logs to find more information about it")]
pub struct PanicCatched;
#[derive(Default)]
pub struct ThreadPoolNoAbortBuilder(ThreadPoolBuilder);
impl ThreadPoolNoAbortBuilder {
pub fn new() -> ThreadPoolNoAbortBuilder {
ThreadPoolNoAbortBuilder::default()
}
pub fn thread_name<F>(mut self, closure: F) -> Self
where
F: FnMut(usize) -> String + 'static,
{
self.0 = self.0.thread_name(closure);
self
}
pub fn num_threads(mut self, num_threads: usize) -> ThreadPoolNoAbortBuilder {
self.0 = self.0.num_threads(num_threads);
self
}
pub fn build(mut self) -> Result<ThreadPoolNoAbort, rayon::ThreadPoolBuildError> {
let pool_catched_panic = Arc::new(AtomicBool::new(false));
self.0 = self.0.panic_handler({
let catched_panic = pool_catched_panic.clone();
move |_result| catched_panic.store(true, Ordering::SeqCst)
});
Ok(ThreadPoolNoAbort { thread_pool: self.0.build()?, pool_catched_panic })
}
}