50 lines
1.0 KiB
Rust
50 lines
1.0 KiB
Rust
#![warn(clippy::readonly_write_lock)]
|
|
|
|
use std::sync::RwLock;
|
|
|
|
fn mutate_i32(x: &mut i32) {
|
|
*x += 1;
|
|
}
|
|
|
|
fn accept_i32(_: i32) {}
|
|
|
|
fn main() {
|
|
let lock = RwLock::new(42);
|
|
let lock2 = RwLock::new(1234);
|
|
|
|
{
|
|
let writer = lock.write().unwrap();
|
|
//~^ ERROR: this write lock is used only for reading
|
|
//~| NOTE: `-D clippy::readonly-write-lock` implied by `-D warnings`
|
|
dbg!(&writer);
|
|
}
|
|
|
|
{
|
|
let writer = lock.write().unwrap();
|
|
//~^ ERROR: this write lock is used only for reading
|
|
accept_i32(*writer);
|
|
}
|
|
|
|
{
|
|
let mut writer = lock.write().unwrap();
|
|
mutate_i32(&mut writer);
|
|
dbg!(&writer);
|
|
}
|
|
|
|
{
|
|
let mut writer = lock.write().unwrap();
|
|
*writer += 1;
|
|
}
|
|
|
|
{
|
|
let mut writer1 = lock.write().unwrap();
|
|
let mut writer2 = lock2.write().unwrap();
|
|
*writer2 += 1;
|
|
*writer1 = *writer2;
|
|
}
|
|
}
|
|
|
|
fn issue12733(rw: &RwLock<()>) {
|
|
let _write_guard = rw.write().unwrap();
|
|
}
|