rust/tests/run-pass/sync.rs

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#![feature(rustc_private)]
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use std::sync::{Mutex, TryLockError};
use std::sync::atomic;
fn main() {
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test_mutex_stdlib();
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#[cfg(not(target_os = "windows"))] // TODO: implement RwLock on Windows
{
test_rwlock_stdlib();
}
test_spin_loop_hint();
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}
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fn test_mutex_stdlib() {
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let m = Mutex::new(0);
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{
let _guard = m.lock();
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assert!(m.try_lock().unwrap_err().would_block());
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}
drop(m.try_lock().unwrap());
drop(m);
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}
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#[cfg(not(target_os = "windows"))]
fn test_rwlock_stdlib() {
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use std::sync::RwLock;
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let rw = RwLock::new(0);
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{
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let _read_guard = rw.read().unwrap();
drop(rw.read().unwrap());
drop(rw.try_read().unwrap());
assert!(rw.try_write().unwrap_err().would_block());
}
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{
let _write_guard = rw.write().unwrap();
assert!(rw.try_read().unwrap_err().would_block());
assert!(rw.try_write().unwrap_err().would_block());
}
}
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trait TryLockErrorExt<T> {
fn would_block(&self) -> bool;
}
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impl<T> TryLockErrorExt<T> for TryLockError<T> {
fn would_block(&self) -> bool {
match self {
TryLockError::WouldBlock => true,
TryLockError::Poisoned(_) => false,
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}
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}
}
fn test_spin_loop_hint() {
atomic::spin_loop_hint();
}