feat(divan_compat): add thread example

Author: not-matthias

crates/divan_compat/Cargo.toml

@@ -33,3 +33,7 @@ harness = false
 [[bench]]
 name = "drop_example"
 harness = false
+
+[[bench]]
+name = "thread_example"
+harness = false

crates/divan_compat/benches/thread_example.rs

@@ -0,0 +1,33 @@
+fn fibo(n: u64) -> u64 {
+    if n <= 1 {
+        n
+    } else {
+        fibo(n - 1) + fibo(n - 2)
+    }
+}
+
+#[codspeed_divan_compat::bench(args = [30, 31, 32])]
+fn fib_in_thread(n: usize) {
+    let handle = std::thread::spawn(move || codspeed_divan_compat::black_box(fibo(n as u64)));
+    handle.join().unwrap();
+}
+
+#[codspeed_divan_compat::bench(args = [30, 31, 32])]
+fn fib_in_thread_bench(bencher: codspeed_divan_compat::Bencher, n: usize) {
+    bencher.bench(|| {
+        let handle = std::thread::spawn(move || codspeed_divan_compat::black_box(fibo(n as u64)));
+        handle.join().unwrap()
+    })
+}
+
+#[codspeed_divan_compat::bench(args = [30, 31, 32])]
+fn fib_in_thread_bench_local(bencher: codspeed_divan_compat::Bencher, n: usize) {
+    bencher.bench_local(|| {
+        let handle = std::thread::spawn(move || codspeed_divan_compat::black_box(fibo(n as u64)));
+        handle.join().unwrap()
+    })
+}
+
+fn main() {
+    codspeed_divan_compat::main();
+}