EventWaitHandle.Set 메서드
정의
중요
일부 정보는 릴리스되기 전에 상당 부분 수정될 수 있는 시험판 제품과 관련이 있습니다. Microsoft는 여기에 제공된 정보에 대해 어떠한 명시적이거나 묵시적인 보증도 하지 않습니다.
하나 이상의 대기 중인 스레드가 계속 진행되도록 이벤트 상태를 신호 받음으로 설정합니다.
public:
bool Set();public bool Set ();member this.Set : unit -> boolPublic Function Set () As Boolean반환
작업이 성공적으로 수행되면 true이고, 그렇지 않으면 false입니다.
예외
Close() 메서드가 이 EventWaitHandle에 대해 이전에 호출된 경우
예제
다음 코드 예제에서는 메서드 오버로드를 사용하여 SignalAndWait(WaitHandle, WaitHandle) 주 스레드가 차단된 스레드에 신호를 보낼 수 있도록 한 다음 스레드가 작업을 완료할 때까지 기다립니다.
이 예제에서는 5개의 스레드를 시작하고 플래그를 EventResetMode.AutoReset 사용하여 만든 스레드를 EventWaitHandle 차단한 다음 사용자가 Enter 키를 누를 때마다 하나의 스레드를 해제할 수 있습니다. 그런 다음, 이 예제에서는 다른 5개의 스레드를 큐에 대기시키고 플래그와 함께 EventResetMode.ManualReset 만든 스레드를 EventWaitHandle 사용하여 모두 해제합니다.
using namespace System;
using namespace System::Threading;
public ref class Example
{
private:
// The EventWaitHandle used to demonstrate the difference
// between AutoReset and ManualReset synchronization events.
//
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.
//
static __int64 threadCount = 0;
// An AutoReset event that allows the main thread to block
// until an exiting thread has decremented the count.
//
static EventWaitHandle^ clearCount =
gcnew EventWaitHandle( false,EventResetMode::AutoReset );
public:
[MTAThread]
static void main()
{
// Create an AutoReset EventWaitHandle.
//
ewh = gcnew 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 = gcnew Thread(
gcnew 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( threadCount ) < 5 )
{
Thread::Sleep( 500 );
}
// Release one thread each time the user presses ENTER,
// until all threads have been released.
//
while ( Interlocked::Read( threadCount ) > 0 )
{
Console::WriteLine( L"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 = gcnew EventWaitHandle( false,EventResetMode::ManualReset );
// Create and start five more numbered threads.
//
for ( int i = 0; i <= 4; i++ )
{
Thread^ t = gcnew Thread(
gcnew ParameterizedThreadStart( ThreadProc ) );
t->Start( i );
}
// Wait until all the threads have started and blocked.
//
while ( Interlocked::Read( threadCount ) < 5 )
{
Thread::Sleep( 500 );
}
// Because the EventWaitHandle was created with
// ManualReset mode, signaling it releases all the
// waiting threads.
//
Console::WriteLine( L"Press ENTER to release the waiting threads." );
Console::ReadLine();
ewh->Set();
}
static void ThreadProc( Object^ data )
{
int index = static_cast<Int32>(data);
Console::WriteLine( L"Thread {0} blocks.", data );
// Increment the count of blocked threads.
Interlocked::Increment( threadCount );
// Wait on the EventWaitHandle.
ewh->WaitOne();
Console::WriteLine( L"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();
}
};
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
설명
with EventWaitHandle EventResetMode.AutoReset (포함 AutoResetEvent)의 경우 메서드는 Set 단일 스레드를 해제합니다. 대기 스레드가 없는 경우 대기 핸들은 스레드가 대기하려고 시도하거나 메서드 Reset 가 호출될 때까지 신호를 유지합니다.
중요
메서드를 호출할 Set 때마다 다시 설정 모드가 있는 스레드가 EventWaitHandle 해제된다는 보장은 EventResetMode.AutoReset없습니다. 두 호출이 너무 가깝기 때문에 스레드가 해제되기 전에 두 번째 호출이 발생하면 하나의 스레드만 해제됩니다. 마치 두 번째 호출이 발생하지 않은 것처럼 표시됩니다. Set 또한 대기 중인 EventWaitHandle 스레드가 없고 이미 신호를 받으면 호출이 적용되지 않습니다.
with EventWaitHandle EventResetMode.ManualReset (포함 ManualResetEvent)의 경우 메서드를 호출하면 Set 메서드가 호출될 때까지 Reset 대기 핸들이 신호된 상태로 남습니다.