From f3c68a0fdf119a3b285c33c38f9f7eebd053c853 Mon Sep 17 00:00:00 2001
From: Amanieu d'Antras <amanieu@gmail.com>
Date: Thu, 26 May 2016 06:10:43 +0100
Subject: [PATCH] Add a test to ensure mutexes and rwlocks can't be re-locked

---
 src/test/run-pass/issue-33770.rs | 100 +++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 src/test/run-pass/issue-33770.rs

diff --git a/src/test/run-pass/issue-33770.rs b/src/test/run-pass/issue-33770.rs
new file mode 100644
index 00000000000..f5635fddaf9
--- /dev/null
+++ b/src/test/run-pass/issue-33770.rs
@@ -0,0 +1,100 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::process::{Command, Stdio};
+use std::env;
+use std::sync::{Mutex, RwLock};
+use std::time::Duration;
+use std::thread;
+
+fn test_mutex() {
+    let m = Mutex::new(0);
+    let _g = m.lock().unwrap();
+    let _g2 = m.lock().unwrap();
+}
+
+fn test_try_mutex() {
+    let m = Mutex::new(0);
+    let _g = m.lock().unwrap();
+    let _g2 = m.try_lock().unwrap();
+}
+
+fn test_rwlock_ww() {
+    let m = RwLock::new(0);
+    let _g = m.write().unwrap();
+    let _g2 = m.write().unwrap();
+}
+
+fn test_try_rwlock_ww() {
+    let m = RwLock::new(0);
+    let _g = m.write().unwrap();
+    let _g2 = m.try_write().unwrap();
+}
+
+fn test_rwlock_rw() {
+    let m = RwLock::new(0);
+    let _g = m.read().unwrap();
+    let _g2 = m.write().unwrap();
+}
+
+fn test_try_rwlock_rw() {
+    let m = RwLock::new(0);
+    let _g = m.read().unwrap();
+    let _g2 = m.try_write().unwrap();
+}
+
+fn test_rwlock_wr() {
+    let m = RwLock::new(0);
+    let _g = m.write().unwrap();
+    let _g2 = m.read().unwrap();
+}
+
+fn test_try_rwlock_wr() {
+    let m = RwLock::new(0);
+    let _g = m.write().unwrap();
+    let _g2 = m.try_read().unwrap();
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    if args.len() > 1 {
+        match &*args[1] {
+            "mutex" => test_mutex(),
+            "try_mutex" => test_try_mutex(),
+            "rwlock_ww" => test_rwlock_ww(),
+            "try_rwlock_ww" => test_try_rwlock_ww(),
+            "rwlock_rw" => test_rwlock_rw(),
+            "try_rwlock_rw" => test_try_rwlock_rw(),
+            "rwlock_wr" => test_rwlock_wr(),
+            "try_rwlock_wr" => test_try_rwlock_wr(),
+            _ => unreachable!(),
+        }
+        // If we reach this point then the test failed
+        println!("TEST FAILED: {}", args[1]);
+    } else {
+        let mut v = vec![];
+        v.push(Command::new(&args[0]).arg("mutex").stderr(Stdio::null()).spawn().unwrap());
+        v.push(Command::new(&args[0]).arg("try_mutex").stderr(Stdio::null()).spawn().unwrap());
+        v.push(Command::new(&args[0]).arg("rwlock_ww").stderr(Stdio::null()).spawn().unwrap());
+        v.push(Command::new(&args[0]).arg("try_rwlock_ww").stderr(Stdio::null()).spawn().unwrap());
+        v.push(Command::new(&args[0]).arg("rwlock_rw").stderr(Stdio::null()).spawn().unwrap());
+        v.push(Command::new(&args[0]).arg("try_rwlock_rw").stderr(Stdio::null()).spawn().unwrap());
+        v.push(Command::new(&args[0]).arg("rwlock_wr").stderr(Stdio::null()).spawn().unwrap());
+        v.push(Command::new(&args[0]).arg("try_rwlock_wr").stderr(Stdio::null()).spawn().unwrap());
+
+        thread::sleep(Duration::new(1, 0));
+
+        // Make sure all subprocesses either panicked or were killed because they deadlocked
+        for mut c in v {
+            c.kill().ok();
+            assert!(!c.wait().unwrap().success());
+        }
+    }
+}