deadlock.java

来自「java课程的资料以及实验的代码」· Java 代码 · 共 68 行

// An example of deadlock.
class A 
{
synchronized void foo(B b) 
{
String name = Thread.currentThread().getName();
System.out.println(name + " entered A.foo");
try 
{
Thread.sleep(1000);
} 
catch(Exception e) 
{
System.out.println("A Interrupted");
}
System.out.println(name + " trying to call B.last()");
b.last();
}
synchronized void last() 
{
System.out.println("Inside A.last");
}
}
class B 
{
synchronized void bar(A a) 
{
String name = Thread.currentThread().getName();
System.out.println(name + " entered B.bar");
try 
{
Thread.sleep(1000);
} 
catch(Exception e) 
{
System.out.println("B Interrupted");
}
System.out.println(name + " trying to call A.last()");
a.last();
}
synchronized void last() 
{
System.out.println("Inside A.last");
}
}
class Deadlock implements Runnable 
{
A a = new A();
B b = new B();
Deadlock() 
{
Thread.currentThread().setName("MainThread");
Thread t = new Thread(this, "RacingThread");
t.start();
a.foo(b); // get lock on a in this thread.
System.out.println("Back in main thread");
}
public void run() 
{
b.bar(a); // get lock on b in other thread.
System.out.println("Back in other thread");
}
public static void main(String args[]) 
{
new Deadlock();
}
}