cdf9a28006
Improves the message of the lints await_holding_lock and await_holding_refcell_ref. Now also actually tests RwLock.
89 lines
1.6 KiB
Rust
89 lines
1.6 KiB
Rust
#![warn(clippy::await_holding_lock)]
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use std::sync::{Mutex, RwLock};
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async fn bad(x: &Mutex<u32>) -> u32 {
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let guard = x.lock().unwrap();
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baz().await
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}
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async fn good(x: &Mutex<u32>) -> u32 {
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{
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let guard = x.lock().unwrap();
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let y = *guard + 1;
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}
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baz().await;
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let guard = x.lock().unwrap();
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47
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}
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pub async fn bad_rw(x: &RwLock<u32>) -> u32 {
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let guard = x.read().unwrap();
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baz().await
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}
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pub async fn bad_rw_write(x: &RwLock<u32>) -> u32 {
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let mut guard = x.write().unwrap();
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baz().await
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}
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pub async fn good_rw(x: &RwLock<u32>) -> u32 {
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{
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let guard = x.read().unwrap();
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let y = *guard + 1;
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}
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{
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let mut guard = x.write().unwrap();
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*guard += 1;
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}
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baz().await;
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let guard = x.read().unwrap();
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47
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}
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async fn baz() -> u32 {
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42
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}
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async fn also_bad(x: &Mutex<u32>) -> u32 {
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let first = baz().await;
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let guard = x.lock().unwrap();
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let second = baz().await;
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let third = baz().await;
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first + second + third
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}
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async fn not_good(x: &Mutex<u32>) -> u32 {
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let first = baz().await;
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let second = {
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let guard = x.lock().unwrap();
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baz().await
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};
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let third = baz().await;
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first + second + third
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}
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#[allow(clippy::manual_async_fn)]
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fn block_bad(x: &Mutex<u32>) -> impl std::future::Future<Output = u32> + '_ {
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async move {
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let guard = x.lock().unwrap();
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baz().await
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}
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}
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fn main() {
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let m = Mutex::new(100);
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good(&m);
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bad(&m);
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also_bad(&m);
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not_good(&m);
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block_bad(&m);
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}
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