显示锁
1定义:显示声明的锁,比如reentrantlock
非显示锁sychronized
公平锁,非公平锁
1定义:这个是reentrantlock底层,默认为非公平锁,速度快
读写锁
1:reentrantlock的分为读写锁,口诀:读读共享,写写互斥,读写互斥
2:应用场景:多读写少的场景
阻塞与唤醒 Condition
1:对于同一个lock,可以加上Condition进行等待唤醒控制
2:比如生产者消费者问题:
package cn.enjoyedu.ch4.rw;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.Consumer;
public class Test1 {
private static Lock lock = new ReentrantLock();
private static Condition notEmpty = lock.newCondition();
private static Condition notFull = lock.newCondition();
private static volatile int count = 0;
public static void main(String[] args) {
ExecutorService pool = Executors.newFixedThreadPool(6);
pool.execute(new Gun(lock, notEmpty, notFull));
pool.execute(new Bullet(lock, notEmpty, notFull));
}
public static class Gun implements Runnable {
private Lock lock;
private Condition notEmpty;
private Condition notFull;
public Gun(Lock lock, Condition notEmpty, Condition notFull) {
this.lock = lock;
this.notEmpty = notEmpty;
this.notFull = notFull;
}
public void run() {
while (true) {
lock.lock();
while (count == 0) {
try {
notEmpty.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println("射击---biubiubiu");
count--;
notFull.signal();
lock.unlock();
}
}
}
public static class Bullet implements Runnable {
private Lock lock;
private Condition notEmpty;
private Condition notFull;
public Bullet(Lock lock, Condition notEmpty, Condition notFull) {
this.lock = lock;
this.notEmpty = notEmpty;
this.notFull = notFull;
}
public void run() {
while (true) {
lock.lock();
while (count >= 20) {
try {
notFull.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println("压入子弹---铛铛");
count++;
notEmpty.signal();
lock.unlock();
}
}
}
}
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