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暂停和中断线程
项目
05/10/2023
同步线程活动最常见的方法是阻止和释放线程，或者锁定对象或代码区域。 有关这些锁定和阻止机制的详细信息，请参阅同步基元概述。 也可使线程将自身置于睡眠状态。 当线程被阻止或处于休眠状态时，可以使用 ThreadInterruptedException 使它们脱离等待状态。 Thread.Sleep 方法调用 Thread.Sleep 方法会导致当前线程立即受阻止，时间为传递到方法的毫秒数或时间间隔，结果是将时间片的剩余部分生成给其他线程。 受阻时间过后，休眠线程继续执行。 一个线程不能调用另一线程上的 Thread.Sleep。 Thread.Sleep 是一种始终让当前线程进入睡眠状态的静态方法。 调用 Thread.Sleep（值为 Timeout.Infinite）可以让线程进入睡眠状态，直到另一个对睡眠线程调用 Thread.Interrupt 方法的线程中断它，或直到 Thread.Abort 方法调用终止它。 下面的示例阐释了这两种中断休眠线程的方法。 using System; using System.Threading; public class Example { public static void Main() { // Interrupt a sleeping thread. var sleepingThread = new Thread(Example.SleepIndefinitely); sleepingThread.Name = "Sleeping"; sleepingThread.Start(); Thread.Sleep(2000); sleepingThread.Interrupt(); Thread.Sleep(1000); sleepingThread = new Thread(Example.SleepIndefinitely); sleepingThread.Name = "Sleeping2"; sleepingThread.Start(); Thread.Sleep(2000); sleepingThread.Abort(); } private static void SleepIndefinitely() { Console.WriteLine("Thread '{0}' about to sleep indefinitely.", Thread.CurrentThread.Name); try { Thread.Sleep(Timeout.Infinite); } catch (ThreadInterruptedException) { Console.WriteLine("Thread '{0}' awoken.", Thread.CurrentThread.Name); } catch (ThreadAbortException) { Console.WriteLine("Thread '{0}' aborted.", Thread.CurrentThread.Name); } finally { Console.WriteLine("Thread '{0}' executing finally block.", Thread.CurrentThread.Name); } Console.WriteLine("Thread '{0} finishing normal execution.", Thread.CurrentThread.Name); Console.WriteLine(); } } // The example displays the following output: // Thread 'Sleeping' about to sleep indefinitely. // Thread 'Sleeping' awoken. // Thread 'Sleeping' executing finally block. // Thread 'Sleeping finishing normal execution. // // Thread 'Sleeping2' about to sleep indefinitely. // Thread 'Sleeping2' aborted. // Thread 'Sleeping2' executing finally block. Imports System.Threading Module Example Public Sub Main() ' Interrupt a sleeping thread. Dim sleepingThread = New Thread(AddressOf Example.SleepIndefinitely) sleepingThread.Name = "Sleeping" sleepingThread.Start() Thread.Sleep(2000) sleepingThread.Interrupt() Thread.Sleep(1000) sleepingThread = New Thread(AddressOf Example.SleepIndefinitely) sleepingThread.Name = "Sleeping2" sleepingThread.Start() Thread.Sleep(2000) sleepingThread.Abort() End Sub Private Sub SleepIndefinitely() Console.WriteLine("Thread '{0}' about to sleep indefinitely.", Thread.CurrentThread.Name) Try Thread.Sleep(Timeout.Infinite) Catch ex As ThreadInterruptedException Console.WriteLine("Thread '{0}' awoken.", Thread.CurrentThread.Name) Catch ex As ThreadAbortException Console.WriteLine("Thread '{0}' aborted.", Thread.CurrentThread.Name) Finally Console.WriteLine("Thread '{0}' executing finally block.", Thread.CurrentThread.Name) End Try Console.WriteLine("Thread '{0} finishing normal execution.", Thread.CurrentThread.Name) Console.WriteLine() End Sub End Module ' The example displays the following output: ' Thread 'Sleeping' about to sleep indefinitely. ' Thread 'Sleeping' awoken. ' Thread 'Sleeping' executing finally block. ' Thread 'Sleeping finishing normal execution. ' ' Thread 'Sleeping2' about to sleep indefinitely. ' Thread 'Sleeping2' aborted. ' Thread 'Sleeping2' executing finally block. 中断线程可以中断正在等待的线程，具体操作是对受阻止的线程调用 Thread.Interrupt 方法，从而抛出 ThreadInterruptedException，以中断对线程执行的阻止调用。 线程应该捕获 ThreadInterruptedException 并执行任何适于继续工作的操作。 如果线程忽略该异常，则运行时捕获异常，并停止该线程。 注意 如果在调用 Thread.Interrupt 时，未阻止目标线程，则线程在被阻止前将不会中断。 如果线程永远不被阻止，则它可在不被中断的情况下完成。 如果等待是托管的等待，则 Thread.Interrupt 和 Thread.Abort 都会立即唤醒线程。 如果等待是非托管等待（例如，调用 Win32 WaitForSingleObject 函数的平台调用），Thread.Interrupt 和 Thread.Abort 都不能控制线程，直到它返回到或调用托管代码。 在托管代码中，该行为如下： Thread.Interrupt 将线程从其可能处于的任何等待中唤醒，并导致在目标线程中引发 ThreadInterruptedException。 仅限 .NET Framework：Thread.Abort 将线程从可能处于的任何等待中唤醒，并导致 ThreadAbortException 在线程中抛出。 有关详细信息，请参阅销毁线程。 另请参阅 Thread ThreadInterruptedException ThreadAbortException 线程处理 使用线程和线程处理 同步基元概述 |
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