61 lines
1.3 KiB
Rust
61 lines
1.3 KiB
Rust
use std::sync::{Mutex, TryLockError};
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use std::sync::atomic;
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use std::hint;
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fn main() {
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test_mutex_stdlib();
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test_rwlock_stdlib();
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test_spin_loop_hint();
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test_thread_yield_now();
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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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{
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let _guard = m.lock();
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assert!(m.try_lock().unwrap_err().would_block());
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}
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drop(m.try_lock().unwrap());
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drop(m);
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}
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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();
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drop(rw.read().unwrap());
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drop(rw.try_read().unwrap());
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assert!(rw.try_write().unwrap_err().would_block());
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}
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{
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let _write_guard = rw.write().unwrap();
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assert!(rw.try_read().unwrap_err().would_block());
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assert!(rw.try_write().unwrap_err().would_block());
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}
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}
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trait TryLockErrorExt<T> {
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fn would_block(&self) -> bool;
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}
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impl<T> TryLockErrorExt<T> for TryLockError<T> {
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fn would_block(&self) -> bool {
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match self {
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TryLockError::WouldBlock => true,
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TryLockError::Poisoned(_) => false,
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}
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}
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}
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fn test_spin_loop_hint() {
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#[allow(deprecated)]
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atomic::spin_loop_hint();
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hint::spin_loop();
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}
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fn test_thread_yield_now() {
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std::thread::yield_now();
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}
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