10.2: nix::fcntl::flock() を使って Cargo.toml に排他ロックを掛け、10秒sleepするプログラム

Author: laysakura

Cargo.lock

@@ -7,4 +7,9 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-lib = { path = "../lib" }
+lib = { path = "../lib" }
+nix = "0.20.0"
+
+[[bin]]
+name = "10_2"
+path = "src/10_2/main.rs"

chapter10/Cargo.toml

@@ -0,0 +1,22 @@
+use std::{thread, time};
+
+use nix::{fcntl, sys};
+
+fn main() -> nix::Result<()> {
+    let fd = fcntl::open(
+        "Cargo.toml",
+        fcntl::OFlag::O_RDONLY,
+        sys::stat::Mode::empty(),
+    )?;
+
+    println!("try locking...");
+    fcntl::flock(fd, fcntl::FlockArg::LockExclusive)?;
+    println!("locked!");
+
+    thread::sleep(time::Duration::from_secs(10));
+
+    fcntl::flock(fd, fcntl::FlockArg::Unlock)?;
+    println!("unlock");
+
+    Ok(())
+}