library/std/src/sys_common/thread_parker/mod.rs


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cfg_if::cfg_if! {
    if #[cfg(any(
        target_os = "linux",
        target_os = "android",
        all(target_arch = "wasm32", target_feature = "atomics"),
        target_os = "freebsd",
        target_os = "openbsd",
        target_os = "dragonfly",
        target_os = "fuchsia",
    ))] {
        mod futex;
        pub use futex::Parker;
    } else if #[cfg(target_os = "solid_asp3")] {
        mod wait_flag;
        pub use wait_flag::Parker;
    } else if #[cfg(any(windows, target_family = "unix"))] {
        pub use crate::sys::thread_parker::Parker;
    } else {
        mod generic;
        pub use generic::Parker;
    }
}