1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package art;
18 
19 public class Test1943 {
run()20   public static void run() throws Exception {
21     final Thread target_thread = new Thread(() -> {
22       nativeRun();
23     }, "target_thread");
24 
25     target_thread.start();
26 
27     // wait for the other thread to spin holding lock.
28     waitForPause();
29 
30     // Ensure that the other thread is in a wait.
31     grabRawMonitor();
32     System.out.println("target_thread is sleeping in a wait.");
33 
34     // Suspend it from java.
35     System.out.println("Suspend target_thread.");
36     Suspension.suspend(target_thread);
37 
38     // Let it try to unlock the monitor.
39     System.out.println("Wake up the target_thread.");
40     // Let the thread try to lock the monitor.
41     nativeNotify();
42 
43     // Ensure that the other thread is suspended without the monitor.
44     grabRawMonitor();
45     System.out.println("target_thread is sleeping in suspend without lock.");
46 
47     // Check other thread is still alive
48     System.out.println("target_thread.isAlive() = " + target_thread.isAlive());
49 
50     // Resume it from java
51     System.out.println("resumed target_thread");
52     Suspension.resume(target_thread);
53 
54     // Make sure the monitor is gone.
55     grabRawMonitor();
56     System.out.println("target_thread doesn't hold lock!");
57 
58     target_thread.join();
59   }
60 
nativeRun()61   public static native void nativeRun();
waitForPause()62   public static native void waitForPause();
nativeNotify()63   public static native void nativeNotify();
64   // Gets then releases raw monitor.
grabRawMonitor()65   public static native void grabRawMonitor();
66 }
67