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  1.  
  2.  
  3.  
  4. public class Main {
  5.   public static void main(String[] args) {
  6.     // These are the two resources R1 and R2 Thread thr1 and thr2 try to get locks for
  7.     final Object R1 = "Resource1";
  8.     final Object R2 = "Resource2";
  9.     // Here's the first thread.  It tries to lock R1 then R2
  10.     Thread thr1 = new Thread() {
  11.       public void run() {
  12.         // Lock resource 1
  13.         synchronized(R1) {
  14.           System.out.println("Thread 1: Acquired and Locked resource 1");
  15.  
  16.           //Force deadlock by sleeping for sometime so that thread2 can come and
  17.           //acquire lock for R2
  18.           try { Thread.sleep(100); } 
  19.           catch (InterruptedException e) {}
  20.           System.out.println("Thread 1: Trying to acquire lock on R2");          
  21.           // Now wait 'till we can get a lock on resource 2
  22.           synchronized(R2) {
  23.             System.out.println("Thread 1: Acquired and Locked resource 2");
  24.           }
  25.         }
  26.       }
  27.     };
  28.  
  29.     // Here's the second thread.  It tries to lock resource2 then resource1
  30.     Thread thr2 = new Thread() {
  31.       public void run() {
  32.         // This thread locks resource 2 right away
  33.         synchronized(R2) {
  34.           System.out.println("Thread 2: Acquired and Locked resource 2");
  35.  
  36.           // Then it pauses, for the same reason as the first thread does
  37.           try { Thread.sleep(100); } 
  38.           catch (InterruptedException e) {}
  39.  
  40.           System.out.println("Thread 2: Trying to acquire lock on R1");          
  41.  
  42.           synchronized(R1) {
  43.             System.out.println("Thread 2: Acquired and Locked resource 1");
  44.           }
  45.         }
  46.       }
  47.     };
  48.  
  49.     // Start the two threads. If all goes as planned, deadlock will occur, 
  50.     // and the program will never exit.
  51.     thr1.start(); 
  52.     thr2.start();
  53.   }
  54. }
Time limit exceeded #stdin #stdout 5s 380864KB
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stdout
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Thread 1: Acquired and Locked resource 1
Thread 2: Acquired and Locked resource 2
Thread 1: Trying to acquire lock on R2
Thread 2: Trying to acquire lock on R1
https://ideone.com/fZNTye
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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