WaitHandle WaitHandle WaitHandle WaitHandle Class

定義

public ref class WaitHandle abstract : MarshalByRefObject, IDisposable

[System.Runtime.InteropServices.ComVisible(true)]
public abstract class WaitHandle : MarshalByRefObject, IDisposable

type WaitHandle = class
    inherit MarshalByRefObject
    interface IDisposable

Public MustInherit Class WaitHandle
Inherits MarshalByRefObject
Implements IDisposable

継承

ObjectObjectObjectObject

MarshalByRefObjectMarshalByRefObjectMarshalByRefObjectMarshalByRefObject

WaitHandleWaitHandleWaitHandleWaitHandle

派生

AutoResetEventAutoResetEventAutoResetEventAutoResetEvent

EventWaitHandleEventWaitHandleEventWaitHandleEventWaitHandle

ManualResetEventManualResetEventManualResetEventManualResetEvent

MutexMutexMutexMutex

SemaphoreSemaphoreSemaphoreSemaphore

属性

ComVisibleAttribute

実装

IDisposableIDisposableIDisposableIDisposable

例

次のコード例に示す 2 つのスレッドができる方法は、メインの中にバック グラウンド タスク スレッド、静的なを使用して、タスクの待機WaitAnyとWaitAllのメソッド、WaitHandleクラス。The following code example shows how two threads can do background tasks while the Main thread waits for the tasks to complete using the static WaitAny and WaitAll methods of the WaitHandle class.

using namespace System;
using namespace System::Threading;

public ref class WaitHandleExample
{
    // Define a random number generator for testing.
private:
    static Random^ random = gcnew Random();
public:
    static void DoTask(Object^ state)
    {
        AutoResetEvent^ autoReset = (AutoResetEvent^) state;
        int time = 1000 * random->Next(2, 10);
        Console::WriteLine("Performing a task for {0} milliseconds.", time);
        Thread::Sleep(time);
        autoReset->Set();
    }
};

int main()
{
    // Define an array with two AutoResetEvent WaitHandles.
    array<WaitHandle^>^ handles = gcnew array<WaitHandle^> {
        gcnew AutoResetEvent(false), gcnew AutoResetEvent(false)};

    // Queue up two tasks on two different threads;
    // wait until all tasks are completed.
    DateTime timeInstance = DateTime::Now;
    Console::WriteLine("Main thread is waiting for BOTH tasks to " +
        "complete.");
    ThreadPool::QueueUserWorkItem(
        gcnew WaitCallback(WaitHandleExample::DoTask), handles[0]);
    ThreadPool::QueueUserWorkItem(
        gcnew WaitCallback(WaitHandleExample::DoTask), handles[1]);
    WaitHandle::WaitAll(handles);
    // The time shown below should match the longest task.
    Console::WriteLine("Both tasks are completed (time waited={0})",
        (DateTime::Now - timeInstance).TotalMilliseconds);

    // Queue up two tasks on two different threads;
    // wait until any tasks are completed.
    timeInstance = DateTime::Now;
    Console::WriteLine();
    Console::WriteLine("The main thread is waiting for either task to " +
        "complete.");
    ThreadPool::QueueUserWorkItem(
        gcnew WaitCallback(WaitHandleExample::DoTask), handles[0]);
    ThreadPool::QueueUserWorkItem(
        gcnew WaitCallback(WaitHandleExample::DoTask), handles[1]);
    int index = WaitHandle::WaitAny(handles);
    // The time shown below should match the shortest task.
    Console::WriteLine("Task {0} finished first (time waited={1}).",
        index + 1, (DateTime::Now - timeInstance).TotalMilliseconds);
}

// This code produces the following sample output.
//
// Main thread is waiting for BOTH tasks to complete.
// Performing a task for 7000 milliseconds.
// Performing a task for 4000 milliseconds.
// Both tasks are completed (time waited=7064.8052)

// The main thread is waiting for either task to complete.
// Performing a task for 2000 milliseconds.
// Performing a task for 2000 milliseconds.
// Task 1 finished first (time waited=2000.6528).

using System;
using System.Threading;

public sealed class App 
{
    // Define an array with two AutoResetEvent WaitHandles.
    static WaitHandle[] waitHandles = new WaitHandle[] 
    {
        new AutoResetEvent(false),
        new AutoResetEvent(false)
    };

    // Define a random number generator for testing.
    static Random r = new Random();

    static void Main() 
    {
        // Queue up two tasks on two different threads; 
        // wait until all tasks are completed.
        DateTime dt = DateTime.Now;
        Console.WriteLine("Main thread is waiting for BOTH tasks to complete.");
        ThreadPool.QueueUserWorkItem(new WaitCallback(DoTask), waitHandles[0]);
        ThreadPool.QueueUserWorkItem(new WaitCallback(DoTask), waitHandles[1]);
        WaitHandle.WaitAll(waitHandles);
        // The time shown below should match the longest task.
        Console.WriteLine("Both tasks are completed (time waited={0})", 
            (DateTime.Now - dt).TotalMilliseconds);

        // Queue up two tasks on two different threads; 
        // wait until any tasks are completed.
        dt = DateTime.Now;
        Console.WriteLine();
        Console.WriteLine("The main thread is waiting for either task to complete.");
        ThreadPool.QueueUserWorkItem(new WaitCallback(DoTask), waitHandles[0]);
        ThreadPool.QueueUserWorkItem(new WaitCallback(DoTask), waitHandles[1]);
        int index = WaitHandle.WaitAny(waitHandles);
        // The time shown below should match the shortest task.
        Console.WriteLine("Task {0} finished first (time waited={1}).",
            index + 1, (DateTime.Now - dt).TotalMilliseconds);
    }

    static void DoTask(Object state) 
    {
        AutoResetEvent are = (AutoResetEvent) state;
        int time = 1000 * r.Next(2, 10);
        Console.WriteLine("Performing a task for {0} milliseconds.", time);
        Thread.Sleep(time);
        are.Set();
    }
}

// This code produces output similar to the following:
//
//  Main thread is waiting for BOTH tasks to complete.
//  Performing a task for 7000 milliseconds.
//  Performing a task for 4000 milliseconds.
//  Both tasks are completed (time waited=7064.8052)
// 
//  The main thread is waiting for either task to complete.
//  Performing a task for 2000 milliseconds.
//  Performing a task for 2000 milliseconds.
//  Task 1 finished first (time waited=2000.6528).

Imports System
Imports System.Threading

NotInheritable Public Class App
    ' Define an array with two AutoResetEvent WaitHandles.
    Private Shared waitHandles() As WaitHandle = _
        {New AutoResetEvent(False), New AutoResetEvent(False)}
    
    ' Define a random number generator for testing.
    Private Shared r As New Random()
    
    <MTAThreadAttribute> _
    Public Shared Sub Main() 
        ' Queue two tasks on two different threads; 
        ' wait until all tasks are completed.
        Dim dt As DateTime = DateTime.Now
        Console.WriteLine("Main thread is waiting for BOTH tasks to complete.")
        ThreadPool.QueueUserWorkItem(AddressOf DoTask, waitHandles(0))
        ThreadPool.QueueUserWorkItem(AddressOf DoTask, waitHandles(1))
        WaitHandle.WaitAll(waitHandles)
        ' The time shown below should match the longest task.
        Console.WriteLine("Both tasks are completed (time waited={0})", _
            (DateTime.Now - dt).TotalMilliseconds)
        
        ' Queue up two tasks on two different threads; 
        ' wait until any tasks are completed.
        dt = DateTime.Now
        Console.WriteLine()
        Console.WriteLine("The main thread is waiting for either task to complete.")
        ThreadPool.QueueUserWorkItem(AddressOf DoTask, waitHandles(0))
        ThreadPool.QueueUserWorkItem(AddressOf DoTask, waitHandles(1))
        Dim index As Integer = WaitHandle.WaitAny(waitHandles)
        ' The time shown below should match the shortest task.
        Console.WriteLine("Task {0} finished first (time waited={1}).", _
            index + 1,(DateTime.Now - dt).TotalMilliseconds)
    
    End Sub 'Main
    
    Shared Sub DoTask(ByVal state As [Object]) 
        Dim are As AutoResetEvent = CType(state, AutoResetEvent)
        Dim time As Integer = 1000 * r.Next(2, 10)
        Console.WriteLine("Performing a task for {0} milliseconds.", time)
        Thread.Sleep(time)
        are.Set()
    
    End Sub 'DoTask
End Class 'App

' This code produces output similar to the following:
'
'  Main thread is waiting for BOTH tasks to complete.
'  Performing a task for 7000 milliseconds.
'  Performing a task for 4000 milliseconds.
'  Both tasks are completed (time waited=7064.8052)
' 
'  The main thread is waiting for either task to complete.
'  Performing a task for 2000 milliseconds.
'  Performing a task for 2000 milliseconds.
'  Task 1 finished first (time waited=2000.6528).

注釈

WaitHandleクラスはネイティブのオペレーティング システムの同期ハンドルをカプセル化し、ランタイム内の複数の待機操作を許可するすべての同期オブジェクトを表すために使用します。The WaitHandle class encapsulates a native operating system synchronization handle and is used to represent all synchronization objects in the runtime that allow multiple wait operations. 他の同期オブジェクトと待機ハンドルの比較は、次を参照してください。同期プリミティブの概要します。For a comparison of wait handles with other synchronization objects, see Overview of Synchronization Primitives.

WaitHandleクラス自体が抽象クラス。The WaitHandle class itself is abstract. 派生したクラスWaitHandleを取得または解放の共有リソースへのアクセスを示すシグナリング機構を定義しますが、使用、継承されたWaitHandleへのアクセスの待機中にブロックするメソッドがリソースを共有します。Classes derived from WaitHandle define a signaling mechanism to indicate taking or releasing access to a shared resource, but they use the inherited WaitHandle methods to block while waiting for access to shared resources. 派生したクラスWaitHandleが含まれます。The classes derived from WaitHandle include:

• Mutex クラスThe Mutex class. 参照してくださいミュー テックスします。See Mutexes.

• EventWaitHandleクラスとその派生クラスでは、AutoResetEventとManualResetEventします。The EventWaitHandle class and its derived classes, AutoResetEvent and ManualResetEvent.

• Semaphore クラスThe Semaphore class. 参照してくださいSemaphore と SemaphoreSlimします。See Semaphore and SemaphoreSlim.

インスタンス メソッドを呼び出して個々 の待機ハンドルに対してスレッドをブロックできますWaitOneから派生したクラスによって継承WaitHandleします。Threads can block on an individual wait handle by calling the instance method WaitOne, which is inherited by classes derived from WaitHandle.

派生クラスのWaitHandleのスレッド アフィニティが異なります。The derived classes of WaitHandle differ in their thread affinity. イベント待機ハンドル (EventWaitHandle、 AutoResetEvent、およびManualResetEvent) セマフォにはスレッド アフィニティがありません。 任意のスレッドは、イベント待機ハンドルまたはセマフォを通知できます。Event wait handles (EventWaitHandle, AutoResetEvent, and ManualResetEvent) and semaphores do not have thread affinity; any thread can signal an event wait handle or semaphore. ミュー テックス、一方ではスレッド アフィニティが;ミュー テックスを所有するスレッドを解放する必要があります、およびスレッドの呼び出し、例外がスローされますが、ReleaseMutexミュー テックスを所有していないメソッドです。Mutexes, on the other hand, do have thread affinity; the thread that owns a mutex must release it, and an exception is thrown if a thread calls the ReleaseMutex method on a mutex that it does not own.

WaitHandleクラスから派生MarshalByRefObject、これらのクラスは、アプリケーション ドメイン境界を越えてスレッドのアクティビティを同期するために使用できます。Because the WaitHandle class derives from MarshalByRefObject, these classes can be used to synchronize the activities of threads across application domain boundaries.

その派生クラスでだけでなく、WaitHandleクラスにはさまざまな 1 つまでスレッドをブロックする静的メソッドまたは複数の同期オブジェクトがシグナルを受信します。In addition to its derived classes, the WaitHandle class has a number of static methods that block a thread until one or more synchronization objects receive a signal. 次の設定があります。These include:

• SignalAndWait、スレッドの 1 つの待機ハンドルを通知し、すぐに別の待つことができます。SignalAndWait, which allows a thread to signal one wait handle and immediately wait on another.

• WaitAll、、スレッド、配列内のすべての待機ハンドルがシグナルを受信するまで待機することができます。WaitAll, which allows a thread to wait until all the wait handles in an array receive a signal.

• WaitAny、、スレッドの待機ハンドルの指定したセットのいずれかが通知されたまで待機することができます。WaitAny, which allows a thread to wait until any one of a specified set of wait handles has been signaled.

これらのメソッドのオーバー ロードは、待機、およびその他のスレッド同期コンテキストを使用できるように、待機に入る前に同期コンテキストを終了する機会を放棄するためのタイムアウト間隔を提供します。The overloads of these methods provide timeout intervals for abandoning the wait, and the opportunity to exit a synchronization context before entering the wait, allowing other threads to use the synchronization context.

WaitHandle 実装して、Disposeパターン。WaitHandle implements the Dispose pattern. 参照してください Dispose メソッドの を実装します。See [Implementing a Dispose method](~/docs/standard/garbage-collection/implementing-dispose .md). 派生させた場合WaitHandleを使用して、SafeWaitHandleネイティブのオペレーティング システム ハンドルを格納するプロパティ。When you derive from WaitHandle, use the SafeWaitHandle property to store your native operating system handle. 保護されたをオーバーライドする必要はありませんDisposeメソッド追加されているアンマネージ リソースを使用する場合を除き、します。You do not need to override the protected Dispose method unless you use additional unmanaged resources.

コンストラクター

フィールド

プロパティ

メソッド

明示的なインターフェイスの実装

Extension Methods

適用対象

スレッド セーフ

この型はスレッド セーフです。This type is thread safe.

こちらもご覧ください

• スレッドThreading
• スレッド処理オブジェクトと機能Threading Objects and Features
• ミューテックスMutexes
• EventWaitHandle、AutoResetEvent、および ManualResetEventEventWaitHandle, AutoResetEvent, and ManualResetEvent
• セマフォSemaphores