Add tokio example

Author: svenstaro

Cargo.toml

@@ -16,3 +16,6 @@ categories = ["os::unix-apis"]
 libc = "0.2.113"
 nix = {version =  "0.29.0", features = ["process", "user", "fs"]}
 thiserror = "2.0.12"
+
+[dev-dependencies]
+tokio = { version = "1.45.0", features = ["rt", "rt-multi-thread", "time"] }

examples/tokio.rs

@@ -0,0 +1,35 @@
+use std::{fs::File, time::Duration};
+
+use daemonize_me::Daemon;
+use tokio::{
+    runtime::Runtime,
+    time::{sleep, Instant},
+};
+
+// We can't use #[tokio::main] here!
+// We need to daemonize first and only then may we initialize the tokio runtime.
+fn main() {
+    let stdout = File::create("info.log").unwrap();
+    let stderr = File::create("err.log").unwrap();
+    let daemon = Daemon::new()
+        .pid_file("example.pid", Some(false))
+        .work_dir(".")
+        .stdout(stdout)
+        .stderr(stderr)
+        .start();
+
+    match daemon {
+        Ok(_) => println!("Daemonized with success"),
+        Err(e) => eprintln!("Error, {}", e),
+    }
+
+    let rt = Runtime::new().unwrap();
+    rt.block_on(async {
+        let now = Instant::now();
+        println!("Before async sleep, elapsed: {}", now.elapsed().as_secs());
+        sleep(Duration::from_secs(5)).await;
+        println!("After async sleep, elapsed: {}", now.elapsed().as_secs());
+    });
+
+    println!("Finished execution");
+}