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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 } }