raii-counter-futures

是DarrenTsung的raii-counter库的分支，允许您异步等待计数达到零。

示例

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;

lib.rs:

raii-counter

Rust类型RAII Counter（计数持有实例的数量，在Drop时减少计数），使用Arc<AtomicUsize>实现。

用于跟踪句柄的持有者数量、跟踪正在进行的交易数量等。

示例

use raii_counter_futures::Counter;

let counter = Counter::new();
assert_eq!(counter.count(), 1);

let weak = counter.downgrade();
assert_eq!(weak.count(), 0);

{
    let _counter1 = weak.spawn_upgrade();
    assert_eq!(weak.count(), 1);
    let _counter2 = weak.spawn_upgrade();
    assert_eq!(weak.count(), 2);
}

assert_eq!(weak.count(), 0);