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    // Copyright 2018 Developers of the Rand project.
    // Copyright 2013-2015 The Rust Project Developers.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    #[cfg(not(any(target_os = "macos", target_os = "ios", target_os = "windows")))]
    pub fn get_nstime() -> u64 {
        use std::time::{SystemTime, UNIX_EPOCH};

        let dur = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
        // The correct way to calculate the current time is
        // `dur.as_secs() * 1_000_000_000 + dur.subsec_nanos() as u64`
        // But this is faster, and the difference in terms of entropy is
        // negligible (log2(10^9) == 29.9).
        dur.as_secs() << 30 | dur.subsec_nanos() as u64
    }

    #[cfg(any(target_os = "macos", target_os = "ios"))]
    pub fn get_nstime() -> u64 {
        use libc;

        // On Mac OS and iOS std::time::SystemTime only has 1000ns resolution.
        // We use `mach_absolute_time` instead. This provides a CPU dependent
        // unit, to get real nanoseconds the result should by multiplied by
        // numer/denom from `mach_timebase_info`.
        // But we are not interested in the exact nanoseconds, just entropy. So
        // we use the raw result.
        unsafe { libc::mach_absolute_time() }
    }

    #[cfg(target_os = "windows")]
    pub fn get_nstime() -> u64 {
        use winapi;

        unsafe {
            let mut t = super::mem::zeroed();
            winapi::um::profileapi::QueryPerformanceCounter(&mut t);
            *t.QuadPart() as u64
        }
    }

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