线程锁
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package com.zy.condition;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
class BoundedBuffer {
final Lock lock = new ReentrantLock();
final Condition notFull = lock.newCondition();
final Condition notEmpty = lock.newCondition();
final Object[] items = new Object[5];
int putptr, takeptr, count;
public void put(Object x) throws InterruptedException {
lock.lock(); //获取锁
try {
// 如果“缓冲已满”,则等待;直到“缓冲”不是满的,才将x添加到缓冲中。
while (count == items.length)
notFull.await();
// 将x添加到缓冲中
items[putptr] = x;
// 将“put统计数putptr+1”;如果“缓冲已满”,则设putptr为0。
if (++putptr == items.length) putptr = 0;
// 将“缓冲”数量+1
++count;
// 唤醒take线程,因为take线程通过notEmpty.await()等待
notEmpty.signal();
// 打印写入的数据
System.out.println(Thread.currentThread().getName() + " put "+ (Integer)x);
} finally {
lock.unlock(); // 释放锁
}
}
public Object take() throws InterruptedException {
lock.lock(); //获取锁
try {
// 如果“缓冲为空”,则等待;直到“缓冲”不为空,才将x从缓冲中取出。
while (count == 0)
notEmpty.await();
// 将x从缓冲中取出
Object x = items[takeptr];
// 将“take统计数takeptr+1”;如果“缓冲为空”,则设takeptr为0。
if (++takeptr == items.length) takeptr = 0;
// 将“缓冲”数量-1
--count;
// 唤醒put线程,因为put线程通过notFull.await()等待
notFull.signal();
// 打印取出的数据
System.out.println(Thread.currentThread().getName() + " take "+ (Integer)x);
return x;
} finally {
lock.unlock(); // 释放锁
}
}
}
public class ConditionTest2 {
private static BoundedBuffer bb = new BoundedBuffer();
public static void main(String[] args) {
// 启动10个“写线程”,向BoundedBuffer中不断的写数据(写入0-9);
// 启动10个“读线程”,从BoundedBuffer中不断的读数据。
for (int i=0; i<10; i++) {
new PutThread("p"+i, i).start();
new TakeThread("t"+i).start();
}
}
static class PutThread extends Thread {
private int num;
public PutThread(String name, int num) {
super(name);
this.num = num;
}
public void run() {
try {
Thread.sleep(1); // 线程休眠1ms
bb.put(num); // 向BoundedBuffer中写入数据
} catch (InterruptedException e) {
}
}
}
static class TakeThread extends Thread {
public TakeThread(String name) {
super(name);
}
public void run() {
try {
Thread.sleep(10); // 线程休眠1ms
Integer num = (Integer)bb.take(); // 从BoundedBuffer中取出数据
} catch (InterruptedException e) {
}
}
}
}
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
class BoundedBuffer {
final Lock lock = new ReentrantLock();
final Condition notFull = lock.newCondition();
final Condition notEmpty = lock.newCondition();
final Object[] items = new Object[5];
int putptr, takeptr, count;
public void put(Object x) throws InterruptedException {
lock.lock(); //获取锁
try {
// 如果“缓冲已满”,则等待;直到“缓冲”不是满的,才将x添加到缓冲中。
while (count == items.length)
notFull.await();
// 将x添加到缓冲中
items[putptr] = x;
// 将“put统计数putptr+1”;如果“缓冲已满”,则设putptr为0。
if (++putptr == items.length) putptr = 0;
// 将“缓冲”数量+1
++count;
// 唤醒take线程,因为take线程通过notEmpty.await()等待
notEmpty.signal();
// 打印写入的数据
System.out.println(Thread.currentThread().getName() + " put "+ (Integer)x);
} finally {
lock.unlock(); // 释放锁
}
}
public Object take() throws InterruptedException {
lock.lock(); //获取锁
try {
// 如果“缓冲为空”,则等待;直到“缓冲”不为空,才将x从缓冲中取出。
while (count == 0)
notEmpty.await();
// 将x从缓冲中取出
Object x = items[takeptr];
// 将“take统计数takeptr+1”;如果“缓冲为空”,则设takeptr为0。
if (++takeptr == items.length) takeptr = 0;
// 将“缓冲”数量-1
--count;
// 唤醒put线程,因为put线程通过notFull.await()等待
notFull.signal();
// 打印取出的数据
System.out.println(Thread.currentThread().getName() + " take "+ (Integer)x);
return x;
} finally {
lock.unlock(); // 释放锁
}
}
}
public class ConditionTest2 {
private static BoundedBuffer bb = new BoundedBuffer();
public static void main(String[] args) {
// 启动10个“写线程”,向BoundedBuffer中不断的写数据(写入0-9);
// 启动10个“读线程”,从BoundedBuffer中不断的读数据。
for (int i=0; i<10; i++) {
new PutThread("p"+i, i).start();
new TakeThread("t"+i).start();
}
}
static class PutThread extends Thread {
private int num;
public PutThread(String name, int num) {
super(name);
this.num = num;
}
public void run() {
try {
Thread.sleep(1); // 线程休眠1ms
bb.put(num); // 向BoundedBuffer中写入数据
} catch (InterruptedException e) {
}
}
}
static class TakeThread extends Thread {
public TakeThread(String name) {
super(name);
}
public void run() {
try {
Thread.sleep(10); // 线程休眠1ms
Integer num = (Integer)bb.take(); // 从BoundedBuffer中取出数据
} catch (InterruptedException e) {
}
}
}
}
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