556e76bb78
This commit is an implementation of [RFC 1040][rfc] which is a redesign of the currently-unstable `Duration` type. The API of the type has been scaled back to be more conservative and it also no longer supports negative durations. [rfc]: https://github.com/rust-lang/rfcs/blob/master/text/1040-duration-reform.md The inner `duration` module of the `time` module has now been hidden (as `Duration` is reexported) and the feature name for this type has changed from `std_misc` to `duration`. All APIs accepting durations have also been audited to take a more flavorful feature name instead of `std_misc`. Closes #24874
95 lines
2.1 KiB
Rust
95 lines
2.1 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(box_syntax, duration, duration_span, collections)]
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use std::env;
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use std::thread;
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use std::time::Duration;
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#[derive(Clone)]
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enum List<T> {
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Nil, Cons(T, Box<List<T>>)
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}
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fn main() {
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let (repeat, depth) = if env::var_os("RUST_BENCH").is_some() {
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(50, 1000)
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} else {
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(10, 10)
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};
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run(repeat, depth);
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}
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fn run(repeat: isize, depth: isize) {
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for _ in 0..repeat {
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let dur = Duration::span(|| {
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let _ = thread::spawn(move|| {
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recurse_or_panic(depth, None)
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}).join();
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});
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println!("iter: {}", dur);
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}
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}
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type nillist = List<()>;
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// Filled with things that have to be unwound
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struct State {
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unique: Box<nillist>,
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vec: Vec<Box<nillist>>,
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res: r
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}
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struct r {
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_l: Box<nillist>,
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}
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impl Drop for r {
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fn drop(&mut self) {}
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}
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fn r(l: Box<nillist>) -> r {
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r {
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_l: l
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}
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}
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fn recurse_or_panic(depth: isize, st: Option<State>) {
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if depth == 0 {
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panic!();
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} else {
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let depth = depth - 1;
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let st = match st {
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None => {
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State {
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unique: box List::Nil,
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vec: vec!(box List::Nil),
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res: r(box List::Nil)
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}
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}
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Some(st) => {
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let mut v = st.vec.clone();
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v.push_all(&[box List::Cons((), st.vec.last().unwrap().clone())]);
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State {
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unique: box List::Cons((), box *st.unique),
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vec: v,
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res: r(box List::Cons((), st.res._l.clone())),
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}
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}
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};
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recurse_or_panic(depth, Some(st));
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}
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}
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