c#调用Monitor.Pulse()时抛出对象同步错误

Question

我正在尝试在我的 GUI 系统中的两个线程之间进行同步。

系统主要任务是初始化两个同步对象并运行两个线程:

private FetcherAPI fetcherAPI { get; set; }
private FileReader fileReader { get; set; }
private object readerLocker;
private object writerLocker;

public Form1() {
    InitializeComponent();
    this.fetcherAPI = new FetcherAPI();
    this.fileReader = new FileReader();

    readerLocker = new object();
    writerLocker = new object();

    new Thread(() => {
        this.fileReader.run(readerLocker);
    });

    new Thread(() => {
        this.fixerAPI.run(writerLocker, readerLocker);
    });
}

private void button1_Click(object sender, EventArgs e) {
    Monitor.Pulse(writerLocker);
}

读者主题:

public void run(object readerLocker) {
    while(true) {
        Monitor.Wait(readerLocker);
        readDataFromFileAndPresent();
    }
}

作者主题:

public void run(object writerLocker, object readerLocker) {
    while(true) {
        Monitor.Wait(writerLocker);
        fetchCurrency();
        Monitor.Pulse(readerLocker);
        Monitor.Wait(readerLocker);   
    }
}

按下按钮时出现以下错误:

object synchronization method was called from an unsynchronized block of code

我做错了什么？

Answer 1

Wait 和 Pulse 只能在您已经拥有锁的情况下调用，即您在锁 语句，或者您已成功使用 Monitor.Enter 获取锁。您还没有完成任何这些事情，所以:确实，它不会起作用。最简单的修复方法是添加一个 lock(writerLocker)。