tokio/src/future/block_on.rs


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use std::future::Future;

cfg_rt! {
    pub(crate) fn block_on<F: Future>(f: F) -> F::Output {
        let mut e = crate::runtime::enter::enter(false);
        e.block_on(f).unwrap()
    }
}

cfg_not_rt! {
    pub(crate) fn block_on<F: Future>(f: F) -> F::Output {
        let mut park = crate::park::thread::CachedParkThread::new();
        park.block_on(f).unwrap()
    }
}