标签:Lock thread2 thread1 lock interrupt import Android
一手遮天 Android - 锁和并发处理: Lock 可 interrupt 的 Lock
示例如下:
/concurrent/LockDemo2.java
/**
* Lock(可 interrupt 的 Lock 的使用)
*
* Lock 是一个接口,ReentrantLock 实现了这个接口
* lockInterruptibly() - 在线程获取锁的过程中,如果线程被 interrupt() 则抛出 InterruptedException 异常
*/
package com.webabcd.androiddemo.concurrent;
import android.os.SystemClock;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import com.webabcd.androiddemo.R;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class LockDemo2 extends AppCompatActivity {
private TextView _textView1;
private Lock _lock = new ReentrantLock();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_concurrent_lockdemo2);
_textView1 = (TextView) findViewById(R.id.textView1);
sample();
}
/**
* 本例(使用 lockInterruptibly() 时)的运行结果类似如下:
* ready(thread1)
* running(thread1)
* ready(thread2)
* interrupted from thread(thread1)
* interrupted from _lock(thread2)
*
* 本例(把 lockInterruptibly() 改成 lock() 时)的运行结果类似如下:
* ready(thread1)
* running(thread1)
* ready(thread2)
* interrupted from thread(thread1)
* running(thread2)
* interrupted from thread(thread2)
*/
private void sample() {
Thread thread1 = new Thread(new MyRunnable(), "thread1");
thread1.setDaemon(true);
thread1.start();
Thread thread2 = new Thread(new MyRunnable(), "thread2");
thread2.setDaemon(true);
thread2.start();
// 用于保证上面的 2 个线程都起来了
SystemClock.sleep(1000);
thread1.interrupt();
thread2.interrupt();
}
class MyRunnable implements Runnable {
@Override
public void run() {
try {
execTask();
} catch (InterruptedException e) {
// 在通过 lockInterruptibly() 获取锁的过程中,线程被 interrupt() 了
writeMessage("interrupted from lock");
}
}
private void execTask() throws InterruptedException {
writeMessage("ready");
_lock.lockInterruptibly(); // 可以把此处改成 _lock.lock(); 之后再运行一下,以便对比一下区别
try {
writeMessage("running");
Thread.sleep(3000);
writeMessage("complete");
} catch (InterruptedException e) {
writeMessage("interrupted from thread");
} finally {
_lock.unlock();
}
}
}
private void writeMessage(final String message) {
final String threadName = Thread.currentThread().getName();
runOnUiThread(new Runnable() {
@Override
public void run() {
_textView1.append(String.format("%s(%s)\n", message, threadName));
}
});
}
}
/layout/activity_concurrent_lockdemo2.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
标签:Lock,thread2,thread1,lock,interrupt,import,Android 来源: https://www.cnblogs.com/webabcd/p/android_concurrent_LockDemo2.html
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