std/sys/sync/thread_parking/
mod.rs

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cfg_if::cfg_if! {
    if #[cfg(any(
        all(target_os = "windows", not(target_vendor = "win7")),
        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",
        target_os = "hermit",
    ))] {
        mod futex;
        pub use futex::Parker;
    } else if #[cfg(any(
        target_os = "netbsd",
        all(target_vendor = "fortanix", target_env = "sgx"),
        target_os = "solid_asp3",
    ))] {
        mod id;
        pub use id::Parker;
    } else if #[cfg(target_vendor = "win7")] {
        mod windows7;
        pub use windows7::Parker;
    } else if #[cfg(all(target_vendor = "apple", not(miri)))] {
        mod darwin;
        pub use darwin::Parker;
    } else if #[cfg(target_os = "xous")] {
        mod xous;
        pub use xous::Parker;
    } else if #[cfg(target_family = "unix")] {
        mod pthread;
        pub use pthread::Parker;
    } else {
        mod unsupported;
        pub use unsupported::Parker;
    }
}