ferrijs-std 0.2.4

Node and web standard library for the ferrijs QuickJS runtime: WHATWG Streams, Events, AbortController, Buffer, crypto, fs, os, url, zlib and the capability model they enforce (partly derived from awslabs/llrt, Apache-2.0).
Documentation 
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
use std::sync::atomic::{AtomicUsize, Ordering};

use tokio::sync::Notify;

#[derive(Default)]
pub struct Latch {
    count: AtomicUsize,
    notify: Notify,
}

impl Latch {
    pub fn increment(&self) {
        self.count.fetch_add(1, Ordering::Relaxed);
    }

    pub fn decrement(&self) {
        let previous = self.count.fetch_sub(1, Ordering::Relaxed);
        if previous == 1 {
            self.notify.notify_waiters();
        }
    }

    pub async fn wait(&self) {
        if self.count.load(Ordering::Relaxed) > 0 {
            self.notify.notified().await;
        }
    }
}