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//@compile-flags: -Zmiri-genmc -Zmiri-disable-stacked-borrows
// SPDX-License-Identifier: MIT
// SPDX-FileCopyrightText: Copyright (c) 2019 Carl Lerche
// This is the test `checks_fail` from loom/test/smoke.rs adapted for Miri-GenMC.
// https://github.com/tokio-rs/loom/blob/dbf32b04bae821c64be44405a0bb72ca08741558/tests/smoke.rs
// This test checks that an incorrect implementation of an incrementing counter is detected.
// The counter behaves wrong if two threads try to increment at the same time (increments can be lost).
#![no_main]
#[cfg(not(any(non_genmc_std, genmc_std)))]
#[path = "../../../utils/genmc.rs"]
mod genmc;
use std::sync::atomic::AtomicUsize;
use std::sync::atomic::Ordering::*;
use crate::genmc::*;
struct BuggyInc {
num: AtomicUsize,
}
impl BuggyInc {
const fn new() -> BuggyInc {
BuggyInc { num: AtomicUsize::new(0) }
}
fn inc(&self) {
// The bug is here:
// Another thread can increment `self.num` between the next two lines,
// which is then overridden by this thread.
let curr = self.num.load(Acquire);
self.num.store(curr + 1, Release);
}
}
#[unsafe(no_mangle)]
fn miri_start(_argc: isize, _argv: *const *const u8) -> isize {
unsafe {
static BUGGY_INC: BuggyInc = BuggyInc::new();
// FIXME(genmc,HACK): remove this initializing write once Miri-GenMC supports mixed atomic-non-atomic accesses.
BUGGY_INC.num.store(0, Relaxed);
let ids = [
spawn_pthread_closure(|| {
BUGGY_INC.inc();
}),
spawn_pthread_closure(|| {
BUGGY_INC.inc();
}),
];
// Join so we can read the final values.
join_pthreads(ids);
// We check that we can detect the incorrect counter implementation:
if 2 != BUGGY_INC.num.load(Relaxed) {
std::process::abort(); //~ ERROR: abnormal termination
}
0
}
}
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