From a4b7ed7a42c716ab9f05e351f003d589124fd55d Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:18:58 +0200
Subject: Adding upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 library/std/src/sync/remutex/tests.rs | 60 +++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 library/std/src/sync/remutex/tests.rs

(limited to 'library/std/src/sync/remutex/tests.rs')

diff --git a/library/std/src/sync/remutex/tests.rs b/library/std/src/sync/remutex/tests.rs
new file mode 100644
index 000000000..fc553081d
--- /dev/null
+++ b/library/std/src/sync/remutex/tests.rs
@@ -0,0 +1,60 @@
+use super::{ReentrantMutex, ReentrantMutexGuard};
+use crate::cell::RefCell;
+use crate::sync::Arc;
+use crate::thread;
+
+#[test]
+fn smoke() {
+    let m = ReentrantMutex::new(());
+    {
+        let a = m.lock();
+        {
+            let b = m.lock();
+            {
+                let c = m.lock();
+                assert_eq!(*c, ());
+            }
+            assert_eq!(*b, ());
+        }
+        assert_eq!(*a, ());
+    }
+}
+
+#[test]
+fn is_mutex() {
+    let m = Arc::new(ReentrantMutex::new(RefCell::new(0)));
+    let m2 = m.clone();
+    let lock = m.lock();
+    let child = thread::spawn(move || {
+        let lock = m2.lock();
+        assert_eq!(*lock.borrow(), 4950);
+    });
+    for i in 0..100 {
+        let lock = m.lock();
+        *lock.borrow_mut() += i;
+    }
+    drop(lock);
+    child.join().unwrap();
+}
+
+#[test]
+fn trylock_works() {
+    let m = Arc::new(ReentrantMutex::new(()));
+    let m2 = m.clone();
+    let _lock = m.try_lock();
+    let _lock2 = m.try_lock();
+    thread::spawn(move || {
+        let lock = m2.try_lock();
+        assert!(lock.is_none());
+    })
+    .join()
+    .unwrap();
+    let _lock3 = m.try_lock();
+}
+
+pub struct Answer<'a>(pub ReentrantMutexGuard<'a, RefCell<u32>>);
+impl Drop for Answer<'_> {
+    fn drop(&mut self) {
+        *self.0.borrow_mut() = 42;
+    }
+}
-- 
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