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#![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.read().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.read().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;
}
}
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