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pub type Mutex<T> = async_std::sync::Arc<async_std::sync::Mutex<T>>;
pub fn mutex<T>(t: T) -> Mutex<T> {
async_std::sync::Arc::new(async_std::sync::Mutex::new(t))
}
pub fn format_duration(dur: std::time::Duration) -> String {
let secs = dur.as_secs();
let nanos = dur.subsec_nanos();
if secs > 60 {
let mins = secs / 60;
let secs = secs - mins * 60;
format!("{}m{}s", mins, secs)
} else if secs > 0 {
format!("{}.{:03}s", secs, nanos / 1_000_000)
} else if nanos >= 1_000_000 {
format!("{}ms", nanos / 1_000_000)
} else if nanos >= 1_000 {
format!("{}us", nanos / 1_000)
} else {
format!("{}ns", nanos)
}
}
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