Document and test minimal stack size on Windows

1 files changed, 13 insertions, 0 deletions

diff --git a/library/std/src/thread/tests.rs b/library/std/src/thread/tests.rs
index 813ede06415..b81efac6761 100644
--- a/library/std/src/thread/tests.rs
+++ b/library/std/src/thread/tests.rs
@@ -423,3 +423,16 @@ fn scope_join_race() {
         });
     }
 }
+
+// Test that the smallest value for stack_size works on Windows.
+#[cfg(windows)]
+#[test]
+fn test_minimal_thread_stack() {
+    use crate::sync::atomic::AtomicU8;
+    static COUNT: AtomicU8 = AtomicU8::new(0);
+
+    let builder = thread::Builder::new().stack_size(1);
+    let before = builder.spawn(|| COUNT.fetch_add(1, Ordering::Relaxed)).unwrap().join().unwrap();
+    assert_eq!(before, 0);
+    assert_eq!(COUNT.load(Ordering::Relaxed), 1);
+}