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https://github.com/rust-lang/rust
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53 lines
1.7 KiB
Rust
53 lines
1.7 KiB
Rust
//@ run-pass
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//@ needs-unwind
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#![allow(overflowing_literals)]
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// Test that we cleanup a fixed size Box<[D; k]> properly when D has a
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// destructor.
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//@ ignore-emscripten no threads support
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use std::thread;
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use std::sync::atomic::{AtomicUsize, Ordering};
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static LOG: AtomicUsize = AtomicUsize::new(0);
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struct D(u8);
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impl Drop for D {
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fn drop(&mut self) {
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println!("Dropping {}", self.0);
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let old = LOG.load(Ordering::SeqCst);
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let _ = LOG.compare_exchange(
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old,
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old << 4 | self.0 as usize,
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Ordering::SeqCst,
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Ordering::SeqCst
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);
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}
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}
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fn main() {
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fn die() -> D { panic!("Oh no"); }
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let g = thread::spawn(|| {
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let _b1: Box<[D; 4]> = Box::new([D( 1), D( 2), D( 3), D( 4)]);
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let _b2: Box<[D; 4]> = Box::new([D( 5), D( 6), D( 7), D( 8)]);
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let _b3: Box<[D; 4]> = Box::new([D( 9), D(10), die(), D(12)]);
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let _b4: Box<[D; 4]> = Box::new([D(13), D(14), D(15), D(16)]);
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});
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assert!(g.join().is_err());
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// When the panic occurs, we will be in the midst of constructing
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// the input to `_b3`. Therefore, we drop the elements of the
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// partially filled array first, before we get around to dropping
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// the elements of `_b1` and _b2`.
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// Issue 23222: The order in which the elements actually get
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// dropped is a little funky. See similar notes in nested-vec-3;
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// in essence, I would not be surprised if we change the ordering
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// given in `expect` in the future.
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let expect = 0x__A_9__5_6_7_8__1_2_3_4;
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let actual = LOG.load(Ordering::SeqCst);
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assert!(actual == expect, "expect: 0x{:x} actual: 0x{:x}", expect, actual);
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}
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