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progress_test's Issues

tokio の poll_write などが止まる

ref techno-tanoC/azusa#34

現象

Progressにデータを書き込みしている最中に to_size を呼ぶと tokio::io::copy が止まる。

struct ProgressInner<T> {
    size: u64,
    buf: T,
}

pub struct Progress<T> {
    inner: Arc<Mutex<ProgressInner<T>>>,
}

impl<T> Progress<T> {
    pub fn new(buf: T) -> Self {
        let inner = Arc::new(Mutex::new(ProgressInner {
            size: 0,
            buf,
        }));
        Progress { inner }
    }

    pub async fn to_size(&self) -> u64 {
        let pg = self.inner.lock().await;
        pg.size
    }
}

今まで調査したこと

  • tokio::sync::RwLock 同様の現象が再現する
  • tokio::io::copy ではなく、代わりに read, write_all を使っても再現する
  • docker上でも再現する
  • linux, macOS 上でも再現する

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