Java中条件变量使用示例及性能测试_java 条件变量使用举例-优快云博客

本文链接：https://blog.youkuaiyun.com/runyon1982/article/details/49018663

本文对比了Java和boost库在实现条件变量时的性能表现，结果显示Java中的条件变量在每秒处理数量上略胜一筹。

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    和前篇文章一样的目的，测试结果也差不多，不过java中的条件变量效率略高于boost，结果是每秒大概20w出头。

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package com.cc;

public class Test {

    static boolean running_flag = true;
    static Object obj = new Object();
    static int cnt = 0;
    static boolean ball = true;

    private static class Run1 implements Runnable {
             public Run1(){}

            public void run() {
                int i = 0;
                while(running_flag){
                    synchronized(obj)
                    {
                        while (ball != true && running_flag){
                            try {
                                obj.wait();
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                        }
                        ++i;
                        ++cnt;
                        if (running_flag){
                            ball = false;
                            obj.notifyAll();
                        }
                    }
                }
                synchronized(obj)
                {
                    System.out.println(i);
                }
            }
    }

    private static class Run2 implements Runnable {
             public Run2(){}

            public void run() {
                int i = 0;
                while(running_flag){
                    synchronized(obj)
                    {
                        while (ball != false && running_flag){
                            try {
                                obj.wait();
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                        }
                        ++i;
                        ++cnt;
                        if (running_flag){
                            ball = true;
                            obj.notifyAll();
                        }
                    }
                }
                synchronized(obj)
                {
                    System.out.println(i);
                }
            }
    }

    public static void main(String[] args) throws InterruptedException {
        Thread thread1 = new Thread(new Run1());
        Thread thread2 = new Thread(new Run2());
        thread1.start();
        thread2.start();
        Thread.sleep(1000);
        running_flag = false;
        synchronized(obj)
        {
            obj.notifyAll();
        }
        thread1.join();
        thread2.join();
        System.out.println(cnt);
    }

}
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