Simple test for RwLock

rwlocktest/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rwlocktest"
+version = "0.1.0"

rwlocktest/Cargo.toml

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+[package]
+name = "rwlocktest"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

rwlocktest/src/main.rs

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+use std::sync::RwLock;
+
+struct Holder {
+    content: RwLock<String>,
+}
+
+impl Holder {
+    fn new() -> Self {
+        Self {
+            content: RwLock::new(String::from("hello")),
+        }
+    }
+
+    fn change(&self, content: &str) {
+        let mut original = self.content.write().unwrap();
+        *original = content.into();
+    }
+
+    fn content(&self) -> String {
+        let lock = self.content.read().unwrap();
+        String::from(&*lock)
+    }
+}
+
+fn main() {
+    let content = Holder::new();
+    println!("Content: {}", content.content());
+
+    content.change("Hello there");
+    println!("Content: {}", content.content());
+}