Question

您好我有一个创建2个线程的示例。我的问题是，当我输出值时，它总是在999之前打印1000.是否可以在1000之前打印999.只是想知道它们是如何订购的？

/cli/aaa/bbb/ccc.php

Answer 1

通常，您不应该编写多线程代码，其中哪些线程首先取决于哪个完成。

但您的要求可以使用Semaphore / WaitHandle

来实现

//Creates semaphore with 1 possible owner and the owner slot taken
var sema = new Semaphore(1, 1);

Thread firstThread = new Thread(new ThreadStart(() =>
{
        //Value set and sema is released, if this thread calls release
        //before `secondThread` attempts to acquire then there will be no stalling
        field.Value = 999;
        sema.Release();
}));

Thread secondThread = new Thread(new ThreadStart(() =>
{
        sema.WaitOne();
        field.Value = 1000;
}));

阅读本书（信息量小书）：第3章 - 基本同步模式，了解有关基本信令/等待的更多信息： http://www.greenteapress.com/semaphores/downey08semaphores.pdf

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