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Diffstat (limited to 'rand/rand_jitter/src/platform.rs')
-rw-r--r-- | rand/rand_jitter/src/platform.rs | 44 |
1 files changed, 0 insertions, 44 deletions
diff --git a/rand/rand_jitter/src/platform.rs b/rand/rand_jitter/src/platform.rs deleted file mode 100644 index 8e3d0fb..0000000 --- a/rand/rand_jitter/src/platform.rs +++ /dev/null @@ -1,44 +0,0 @@ -// 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 - } -} |