在释放模式无限循环 [英] Infinite loop in release mode

问题描述

当我运行下面的code中的调试的模式，它会成功完成并退出。但是，如果我运行下面的code中的发布的模式，它会陷入一个死循环，永不结束。

When I run the following code in debug mode, it'll successfully finish and exit. However, if I run the following code in release mode, it'll get stuck in an infinite loop and never finish.

static void Main(string[] args)
{
    bool stop = false;

    new Thread(() =>
    {
        Thread.Sleep(1000);
        stop = true;
        Console.WriteLine("Set \"stop\" to true.");

    }).Start();

    Console.WriteLine("Entering loop.");

    while (!stop)
    {
    }

    Console.WriteLine("Done.");
}

这优化使其陷入一个死循环？

Which optimization is causing it to get stuck in an infinite loop?

推荐答案

我的猜测是在主线程中的停止变量的处理器缓存。在调试模式下，内存模式是严格的，因为调试器必须能够在所有线程提供变量的状态的一个明智的看法。

My guess would be processor caching of the stop variable on the main thread. In debug mode the memory model is stricter because the debugger needs to be able to provide a sensible view of the variable's state across all threads.

试着做一个字段，并标记为挥发性

Try making a field and marking it as volatile:

volatile bool stop = false;

static void Main(string[] args)
{

    new Thread(() =>
    {
        Thread.Sleep(1000);
        stop = true;
        Console.WriteLine("Set \"stop\" to true.");

    }).Start();

    Console.WriteLine("Entering loop.");

    while (!stop)
    {
    }

    Console.WriteLine("Done.");
}

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