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    //! Abstracts out the APIs necessary to `Runtime` for integrating the blocking
    //! pool. When the `blocking` feature flag is **not** enabled, these APIs are
    //! shells. This isolates the complexity of dealing with conditional
    //! compilation.

    mod pool;
    pub(crate) use pool::{spawn_blocking, BlockingPool, Spawner};

    mod schedule;
    mod shutdown;
    pub(crate) mod task;

    use crate::runtime::Builder;

    pub(crate) fn create_blocking_pool(builder: &Builder, thread_cap: usize) -> BlockingPool {
        BlockingPool::new(builder, thread_cap)
    }

    /*
    cfg_not_blocking_impl! {
        use crate::runtime::Builder;
        use std::time::Duration;

        #[derive(Debug, Clone)]
        pub(crate) struct BlockingPool {}

        pub(crate) use BlockingPool as Spawner;

        pub(crate) fn create_blocking_pool(_builder: &Builder, _thread_cap: usize) -> BlockingPool {
            BlockingPool {}
        }

        impl BlockingPool {
            pub(crate) fn spawner(&self) -> &BlockingPool {
                self
            }

            pub(crate) fn shutdown(&mut self, _duration: Option<Duration>) {
            }
        }
    }
    */