Fork of DarrenTsung's raii-counter library that allows you to wait asynchronously for the count to reach zero.
use raii_counter_futures::WeakCounter;
use std::time::Duration;
let weak = Arc::new(WeakCounter::new());
assert_eq!(counter.count(), 0);
let weak2 = Arc::clone(&weak);
tokio::spawn(async move {
let counter1 = weak2.spawn_upgrade();
let counter2 = weak2.spawn_upgrade();
tokio::time::delay_for(Duration::from_secs(2)).await;
});
// Give the weak counters a chance to spawn, in a real workload you would not
// want to start waiting immediately after your async tasks spawn.
tokio::time::delay_for(Duration::from_millis(500)).await;
// This will not complete until the 2 second delay in the async task has finished.
counter.wait_for_empty().await;