54 lines
1.5 KiB
Java
54 lines
1.5 KiB
Java
// threads/Interrupting2.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// Interrupting a task blocked with a ReentrantLock
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import java.util.concurrent.*;
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import java.util.concurrent.locks.*;
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class BlockedMutex {
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private Lock lock = new ReentrantLock();
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public BlockedMutex() {
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// Acquire it right away, to demonstrate interruption
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// of a task blocked on a ReentrantLock:
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lock.lock();
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}
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public void f() {
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try {
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// This will never be available to a second task
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lock.lockInterruptibly(); // Special call
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System.out.println("lock acquired in f()");
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} catch(InterruptedException e) {
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System.out.println(
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"Interrupted from lock acquisition in f()");
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}
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}
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}
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class Blocked2 implements Runnable {
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BlockedMutex blocked = new BlockedMutex();
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@Override
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public void run() {
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System.out.println("Waiting for f() in BlockedMutex");
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blocked.f();
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System.out.println("Broken out of blocked call");
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}
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}
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public class Interrupting2 {
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public static void
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main(String[] args) throws Exception {
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Thread t = new Thread(new Blocked2());
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t.start();
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TimeUnit.SECONDS.sleep(1);
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System.out.println("Issuing t.interrupt()");
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t.interrupt();
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}
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}
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/* Output:
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Waiting for f() in BlockedMutex
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Issuing t.interrupt()
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Interrupted from lock acquisition in f()
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Broken out of blocked call
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*/
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