106 lines
3.9 KiB
Rust
106 lines
3.9 KiB
Rust
// Copyright 2013 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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use std::sync::atomic::{AtomicUsize, ATOMIC_USIZE_INIT, Ordering};
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use std::rand::{thread_rng, Rng, Rand};
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use std::thread::Thread;
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const REPEATS: uint = 5;
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const MAX_LEN: uint = 32;
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static drop_counts: [AtomicUsize; MAX_LEN] =
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// FIXME #5244: AtomicUsize is not Copy.
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[
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ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT,
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ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT,
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ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT,
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ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT,
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ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT,
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ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT,
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ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT,
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ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT,
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ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT,
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ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT,
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ATOMIC_USIZE_INIT, ATOMIC_USIZE_INIT,
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];
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static creation_count: AtomicUsize = ATOMIC_USIZE_INIT;
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#[derive(Clone, PartialEq, PartialOrd, Eq, Ord)]
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struct DropCounter { x: uint, creation_id: uint }
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impl Rand for DropCounter {
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fn rand<R: Rng>(rng: &mut R) -> DropCounter {
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// (we're not using this concurrently, so Relaxed is fine.)
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let num = creation_count.fetch_add(1, Ordering::Relaxed);
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DropCounter {
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x: rng.gen(),
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creation_id: num
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}
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}
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}
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impl Drop for DropCounter {
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fn drop(&mut self) {
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drop_counts[self.creation_id].fetch_add(1, Ordering::Relaxed);
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}
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}
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pub fn main() {
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assert!(MAX_LEN <= std::uint::BITS);
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// len can't go above 64.
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for len in 2..MAX_LEN {
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for _ in 0..REPEATS {
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// reset the count for these new DropCounters, so their
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// IDs start from 0.
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creation_count.store(0, Ordering::Relaxed);
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let main = thread_rng().gen_iter::<DropCounter>()
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.take(len)
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.collect::<Vec<DropCounter>>();
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// work out the total number of comparisons required to sort
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// this array...
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let mut count = 0;
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main.clone().as_mut_slice().sort_by(|a, b| { count += 1; a.cmp(b) });
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// ... and then panic on each and every single one.
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for panic_countdown in 0i..count {
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// refresh the counters.
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for c in drop_counts.iter() {
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c.store(0, Ordering::Relaxed);
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}
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let v = main.clone();
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let _ = Thread::scoped(move|| {
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let mut v = v;
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let mut panic_countdown = panic_countdown;
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v.as_mut_slice().sort_by(|a, b| {
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if panic_countdown == 0 {
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panic!()
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}
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panic_countdown -= 1;
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a.cmp(b)
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})
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}).join();
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// check that the number of things dropped is exactly
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// what we expect (i.e. the contents of `v`).
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for (i, c) in drop_counts.iter().enumerate().take(len) {
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let count = c.load(Ordering::Relaxed);
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assert!(count == 1,
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"found drop count == {} for i == {}, len == {}",
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count, i, len);
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}
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}
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}
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}
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}
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