c# - 线程. sleep (-1)

Question

有什么用

 System.Threading.Thread.Sleep(-1)

我希望这会引发异常，正如 Thread.Sleep 的文档所说

The value of timeout is negative and is not equal to Timeout.Infinite in milliseconds, or is greater than Int32.MaxValue milliseconds.

但是，上面的 Thread.Sleep(-1) 不会抛出异常。当我查看 ReferenceSource 时，我看到了

[System.Security.SecuritySafeCritical]  // auto-generated
public static void Sleep(int millisecondsTimeout)
{
    SleepInternal(millisecondsTimeout);
    // Ensure we don't return to app code when the pause is underway
    if(AppDomainPauseManager.IsPaused)
        AppDomainPauseManager.ResumeEvent.WaitOneWithoutFAS();
}

public static void Sleep(TimeSpan timeout)
{
    long tm = (long)timeout.TotalMilliseconds;
    if (tm < -1 || tm > (long) Int32.MaxValue)
        throw new  ArgumentOutOfRangeException("timeout",Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegOrNegative1"));
    Sleep((int)tm);
}

看起来它不会抛出负时间跨度，而只会抛出小于 -1 的负时间跨度。

确实如此

 Thread.Sleep(-2);

确实会崩溃。

那么这里-1的特例是什么？ Thread.Sleep(-1) 实际上在做什么？

Answer 1

Timeout.Infinite 的值== -1。

Timeout.Infinite : A constant used to specify an infinite waiting period, for threading methods that accept an Int32 parameter.