From 1b6a04ca5504955c571d1c97504fb45ea0befee4 Mon Sep 17 00:00:00 2001
From: Valentin Popov <valentin@popov.link>
Date: Mon, 8 Jan 2024 01:21:28 +0400
Subject: Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>
---
 vendor/once_cell/examples/bench.rs | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 vendor/once_cell/examples/bench.rs

(limited to 'vendor/once_cell/examples/bench.rs')

diff --git a/vendor/once_cell/examples/bench.rs b/vendor/once_cell/examples/bench.rs
new file mode 100644
index 0000000..e680125
--- /dev/null
+++ b/vendor/once_cell/examples/bench.rs
@@ -0,0 +1,28 @@
+use std::mem::size_of;
+
+use once_cell::sync::OnceCell;
+
+const N_THREADS: usize = 32;
+const N_ROUNDS: usize = 100_000_000;
+
+static CELL: OnceCell<usize> = OnceCell::new();
+
+fn main() {
+    let start = std::time::Instant::now();
+    let threads =
+        (0..N_THREADS).map(|i| std::thread::spawn(move || thread_main(i))).collect::<Vec<_>>();
+    for thread in threads {
+        thread.join().unwrap();
+    }
+    println!("{:?}", start.elapsed());
+    println!("size_of::<OnceCell<()>>()   = {:?}", size_of::<OnceCell<()>>());
+    println!("size_of::<OnceCell<bool>>() = {:?}", size_of::<OnceCell<bool>>());
+    println!("size_of::<OnceCell<u32>>()  = {:?}", size_of::<OnceCell<u32>>());
+}
+
+fn thread_main(i: usize) {
+    for _ in 0..N_ROUNDS {
+        let &value = CELL.get_or_init(|| i);
+        assert!(value < N_THREADS)
+    }
+}
-- 
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