EventResetMode Enumeration
Definition
Wichtig
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Gibt an, ob ein EventWaitHandle automatisch oder manuell zurückgesetzt wird, nachdem ein Signal empfangen wurde.
public enum class EventResetModepublic enum EventResetMode[System.Runtime.InteropServices.ComVisible(false)]
public enum EventResetModetype EventResetMode = [<System.Runtime.InteropServices.ComVisible(false)>]
type EventResetMode = Public Enum EventResetMode- Vererbung
- Attribute
Felder
| Name | Wert | Beschreibung |
|---|---|---|
| AutoReset | 0 | Bei signalisierter Signalisierung wird die EventWaitHandle Zurücksetzung nach dem Freigeben eines einzelnen Threads automatisch zurückgesetzt. Wenn keine Threads warten, wird der EventWaitHandle Rest bis zu einem Thread blockiert und nach dem Freigeben des Threads zurückgesetzt. |
| ManualReset | 1 | Bei signalisierter Signalisierung werden alle EventWaitHandle wartenden Threads freigegeben und bis zum manuellen Zurücksetzen signalisiert. |
Beispiele
Im folgenden Codebeispiel wird die SignalAndWait(WaitHandle, WaitHandle) Methodenüberladung verwendet, um dem Hauptthread das Signal eines blockierten Threads zu ermöglichen und dann zu warten, bis der Thread eine Aufgabe beendet hat.
Das Beispiel startet fünf Threads und ermöglicht es ihnen, für ein EventWaitHandle erstelltes Element mit dem AutoReset-Flag zu blockieren, und gibt dann jedes Mal, wenn der Benutzer die EINGABETASTE drückt, einen Thread los. Im Beispiel werden dann weitere fünf Threads in die Warteschlange gestellt und alle EventWaitHandle mit dem ManualReset-Flag erstellt.
using System;
using System.Threading;
public class Example
{
// The EventWaitHandle used to demonstrate the difference
// between AutoReset and ManualReset synchronization events.
//
private static EventWaitHandle ewh;
// A counter to make sure all threads are started and
// blocked before any are released. A Long is used to show
// the use of the 64-bit Interlocked methods.
//
private static long threadCount = 0;
// An AutoReset event that allows the main thread to block
// until an exiting thread has decremented the count.
//
private static EventWaitHandle clearCount =
new EventWaitHandle(false, EventResetMode.AutoReset);
[MTAThread]
public static void Main()
{
// Create an AutoReset EventWaitHandle.
//
ewh = new EventWaitHandle(false, EventResetMode.AutoReset);
// Create and start five numbered threads. Use the
// ParameterizedThreadStart delegate, so the thread
// number can be passed as an argument to the Start
// method.
for (int i = 0; i <= 4; i++)
{
Thread t = new Thread(
new ParameterizedThreadStart(ThreadProc)
);
t.Start(i);
}
// Wait until all the threads have started and blocked.
// When multiple threads use a 64-bit value on a 32-bit
// system, you must access the value through the
// Interlocked class to guarantee thread safety.
//
while (Interlocked.Read(ref threadCount) < 5)
{
Thread.Sleep(500);
}
// Release one thread each time the user presses ENTER,
// until all threads have been released.
//
while (Interlocked.Read(ref threadCount) > 0)
{
Console.WriteLine("Press ENTER to release a waiting thread.");
Console.ReadLine();
// SignalAndWait signals the EventWaitHandle, which
// releases exactly one thread before resetting,
// because it was created with AutoReset mode.
// SignalAndWait then blocks on clearCount, to
// allow the signaled thread to decrement the count
// before looping again.
//
WaitHandle.SignalAndWait(ewh, clearCount);
}
Console.WriteLine();
// Create a ManualReset EventWaitHandle.
//
ewh = new EventWaitHandle(false, EventResetMode.ManualReset);
// Create and start five more numbered threads.
//
for(int i=0; i<=4; i++)
{
Thread t = new Thread(
new ParameterizedThreadStart(ThreadProc)
);
t.Start(i);
}
// Wait until all the threads have started and blocked.
//
while (Interlocked.Read(ref threadCount) < 5)
{
Thread.Sleep(500);
}
// Because the EventWaitHandle was created with
// ManualReset mode, signaling it releases all the
// waiting threads.
//
Console.WriteLine("Press ENTER to release the waiting threads.");
Console.ReadLine();
ewh.Set();
}
public static void ThreadProc(object data)
{
int index = (int) data;
Console.WriteLine("Thread {0} blocks.", data);
// Increment the count of blocked threads.
Interlocked.Increment(ref threadCount);
// Wait on the EventWaitHandle.
ewh.WaitOne();
Console.WriteLine("Thread {0} exits.", data);
// Decrement the count of blocked threads.
Interlocked.Decrement(ref threadCount);
// After signaling ewh, the main thread blocks on
// clearCount until the signaled thread has
// decremented the count. Signal it now.
//
clearCount.Set();
}
}
Imports System.Threading
Public Class Example
' The EventWaitHandle used to demonstrate the difference
' between AutoReset and ManualReset synchronization events.
'
Private Shared ewh As EventWaitHandle
' A counter to make sure all threads are started and
' blocked before any are released. A Long is used to show
' the use of the 64-bit Interlocked methods.
'
Private Shared threadCount As Long = 0
' An AutoReset event that allows the main thread to block
' until an exiting thread has decremented the count.
'
Private Shared clearCount As New EventWaitHandle(False, _
EventResetMode.AutoReset)
<MTAThread> _
Public Shared Sub Main()
' Create an AutoReset EventWaitHandle.
'
ewh = New EventWaitHandle(False, EventResetMode.AutoReset)
' Create and start five numbered threads. Use the
' ParameterizedThreadStart delegate, so the thread
' number can be passed as an argument to the Start
' method.
For i As Integer = 0 To 4
Dim t As New Thread(AddressOf ThreadProc)
t.Start(i)
Next i
' Wait until all the threads have started and blocked.
' When multiple threads use a 64-bit value on a 32-bit
' system, you must access the value through the
' Interlocked class to guarantee thread safety.
'
While Interlocked.Read(threadCount) < 5
Thread.Sleep(500)
End While
' Release one thread each time the user presses ENTER,
' until all threads have been released.
'
While Interlocked.Read(threadCount) > 0
Console.WriteLine("Press ENTER to release a waiting thread.")
Console.ReadLine()
' SignalAndWait signals the EventWaitHandle, which
' releases exactly one thread before resetting,
' because it was created with AutoReset mode.
' SignalAndWait then blocks on clearCount, to
' allow the signaled thread to decrement the count
' before looping again.
'
WaitHandle.SignalAndWait(ewh, clearCount)
End While
Console.WriteLine()
' Create a ManualReset EventWaitHandle.
'
ewh = New EventWaitHandle(False, EventResetMode.ManualReset)
' Create and start five more numbered threads.
'
For i As Integer = 0 To 4
Dim t As New Thread(AddressOf ThreadProc)
t.Start(i)
Next i
' Wait until all the threads have started and blocked.
'
While Interlocked.Read(threadCount) < 5
Thread.Sleep(500)
End While
' Because the EventWaitHandle was created with
' ManualReset mode, signaling it releases all the
' waiting threads.
'
Console.WriteLine("Press ENTER to release the waiting threads.")
Console.ReadLine()
ewh.Set()
End Sub
Public Shared Sub ThreadProc(ByVal data As Object)
Dim index As Integer = CInt(data)
Console.WriteLine("Thread {0} blocks.", data)
' Increment the count of blocked threads.
Interlocked.Increment(threadCount)
' Wait on the EventWaitHandle.
ewh.WaitOne()
Console.WriteLine("Thread {0} exits.", data)
' Decrement the count of blocked threads.
Interlocked.Decrement(threadCount)
' After signaling ewh, the main thread blocks on
' clearCount until the signaled thread has
' decremented the count. Signal it now.
'
clearCount.Set()
End Sub
End Class