48 lines
1.3 KiB
Java
48 lines
1.3 KiB
Java
//: concurrency/Interrupting2.java
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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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import static net.mindview.util.Print.*;
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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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print("lock acquired in f()");
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} catch(InterruptedException e) {
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print("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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public void run() {
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print("Waiting for f() in BlockedMutex");
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blocked.f();
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print("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 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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} /* 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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