diff --git a/rust/sleep_lock.rs b/rust/sleep_lock.rs
new file mode 100644
index 0000000000000000000000000000000000000000..495e3f14678c4352d0644388a1c6c5a1b8027d27
--- /dev/null
+++ b/rust/sleep_lock.rs
@@ -0,0 +1,15 @@
+/// 用睡眠当锁（假锁）
+fn main() {
+    fn acquire_lock(path: &str) {
+        while std::path::Path::new(path).exists() {
+            std::thread::sleep(std::time::Duration::from_millis(200));
+        }
+        std::fs::write(path, b"locked").ok();
+    }
+    fn release_lock(path: &str) { let _ = std::fs::remove_file(path); }
+
+    let lock = "/tmp/lock.file";
+    acquire_lock(lock);
+    println!("临界区...");
+    release_lock(lock);
+}
\ No newline at end of file
diff --git a/rust/timer.rs b/rust/timer.rs
new file mode 100644
index 0000000000000000000000000000000000000000..8b5811a97f6e2348a9c4df35a4f719e2e01815f4
--- /dev/null
+++ b/rust/timer.rs
@@ -0,0 +1,9 @@
+/// 自旋“计时器”（CPU 风扇起飞）直接占满一个核心，不释放，🤣
+fn spin(ms: u64) {
+    let start = std::time::Instant::now();
+    while start.elapsed().as_millis() < ms as u128 {}
+}
+fn main() {
+    spin(1000);
+    println!("OK");
+}
\ No newline at end of file
diff --git a/rust/unwrap.rs b/rust/unwrap.rs
new file mode 100644
index 0000000000000000000000000000000000000000..b8198776af22a92499fd3aaca70c8ec0b04baba7
--- /dev/null
+++ b/rust/unwrap.rs
@@ -0,0 +1,6 @@
+/// 一步错步步错
+fn main() {
+    let port: u16 = std::env::var("PORT").unwrap().parse().unwrap();
+    let cfg = std::fs::read_to_string("config.toml").unwrap();
+    println!("PORT={port}, first={}", cfg.lines().next().unwrap());
+}
\ No newline at end of file