Timer.Stop 메서드
정의
중요
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public:
void Stop();public void Stop ();member this.Stop : unit -> unitPublic Sub Stop ()예제
다음 예제에서는 2초마다 이벤트를 발생 Timer.Elapsed 시키는 개체를 인스턴스화 System.Timers.Timer 하고(2,000밀리초) 이벤트에 대한 이벤트 처리기를 설정하고 타이머를 시작합니다. 이벤트 처리기는 발생할 때마다 속성의 ElapsedEventArgs.SignalTime 값을 표시합니다. 사용자가 Enter 키를 누르면 애플리케이션이 애플리케이션을 종료하기 전에 메서드를 호출 Stop 합니다.
using System;
using System.Timers;
public class Example
{
private static System.Timers.Timer aTimer;
public static void Main()
{
SetTimer();
Console.WriteLine("\nPress the Enter key to exit the application...\n");
Console.WriteLine("The application started at {0:HH:mm:ss.fff}", DateTime.Now);
Console.ReadLine();
aTimer.Stop();
aTimer.Dispose();
Console.WriteLine("Terminating the application...");
}
private static void SetTimer()
{
// Create a timer with a two second interval.
aTimer = new System.Timers.Timer(2000);
// Hook up the Elapsed event for the timer.
aTimer.Elapsed += OnTimedEvent;
aTimer.AutoReset = true;
aTimer.Enabled = true;
}
private static void OnTimedEvent(Object source, ElapsedEventArgs e)
{
Console.WriteLine("The Elapsed event was raised at {0:HH:mm:ss.fff}",
e.SignalTime);
}
}
// The example displays output like the following:
// Press the Enter key to exit the application...
//
// The application started at 09:40:29.068
// The Elapsed event was raised at 09:40:31.084
// The Elapsed event was raised at 09:40:33.100
// The Elapsed event was raised at 09:40:35.100
// The Elapsed event was raised at 09:40:37.116
// The Elapsed event was raised at 09:40:39.116
// The Elapsed event was raised at 09:40:41.117
// The Elapsed event was raised at 09:40:43.132
// The Elapsed event was raised at 09:40:45.133
// The Elapsed event was raised at 09:40:47.148
//
// Terminating the application...
open System
open System.Timers
let onTimedEvent source (e: ElapsedEventArgs) =
printfn $"""The Elapsed event was raised at {e.SignalTime.ToString "HH:mm:ss.fff"}"""
// Create a timer with a two second interval.
let aTimer = new Timer 2000
// Hook up the Elapsed event for the timer.
aTimer.Elapsed.AddHandler onTimedEvent
aTimer.AutoReset <- true
aTimer.Enabled <- true
printfn "\nPress the Enter key to exit the application...\n"
printfn $"""The application started at {DateTime.Now.ToString "HH:mm:ss.fff"}"""
stdin.ReadLine() |> ignore
aTimer.Stop()
aTimer.Dispose()
printfn "Terminating the application..."
// The example displays output like the following:
// Press the Enter key to exit the application...
//
// The application started at 09:40:29.068
// The Elapsed event was raised at 09:40:31.084
// The Elapsed event was raised at 09:40:33.100
// The Elapsed event was raised at 09:40:35.100
// The Elapsed event was raised at 09:40:37.116
// The Elapsed event was raised at 09:40:39.116
// The Elapsed event was raised at 09:40:41.117
// The Elapsed event was raised at 09:40:43.132
// The Elapsed event was raised at 09:40:45.133
// The Elapsed event was raised at 09:40:47.148
//
// Terminating the application...
Imports System.Timers
Public Module Example
Private aTimer As System.Timers.Timer
Public Sub Main()
SetTimer()
Console.WriteLine("{0}Press the Enter key to exit the application...{0}",
vbCrLf)
Console.WriteLine("The application started at {0:HH:mm:ss.fff}",
DateTime.Now)
Console.ReadLine()
aTimer.Stop()
aTimer.Dispose()
Console.WriteLine("Terminating the application...")
End Sub
Private Sub SetTimer()
' Create a timer with a two second interval.
aTimer = New System.Timers.Timer(2000)
' Hook up the Elapsed event for the timer.
AddHandler aTimer.Elapsed, AddressOf OnTimedEvent
aTimer.AutoReset = True
aTimer.Enabled = True
End Sub
' The event handler for the Timer.Elapsed event.
Private Sub OnTimedEvent(source As Object, e As ElapsedEventArgs)
Console.WriteLine("The Elapsed event was raised at {0:HH:mm:ss.fff}",
e.SignalTime)
End Sub
End Module
' The example displays output like the following:
' Press the Enter key to exit the application...
'
' The application started at 09:40:29.068
' The Elapsed event was raised at 09:40:31.084
' The Elapsed event was raised at 09:40:33.100
' The Elapsed event was raised at 09:40:35.100
' The Elapsed event was raised at 09:40:37.116
' The Elapsed event was raised at 09:40:39.116
' The Elapsed event was raised at 09:40:41.117
' The Elapsed event was raised at 09:40:43.132
' The Elapsed event was raised at 09:40:45.133
' The Elapsed event was raised at 09:40:47.148
'
' Terminating the application...
다음 코드 예제에서는 현재 실행 중인 이벤트가 종료될 때까지 메서드를 호출 Stop 하는 Elapsed 스레드가 계속되지 않도록 하고 두 Elapsed 이벤트가 동시에 이벤트 처리기를 실행하지 못하도록 하는 한 가지 방법을 보여 줍니다(재진입이라고도 함).
이 예제에서는 100개의 테스트 실행을 실행합니다. 테스트가 실행될 때마다 타이머는 150밀리초 간격으로 시작됩니다. 이벤트 처리기는 메서드를 Thread.Sleep 사용하여 길이가 50밀리초에서 200밀리초까지 임의로 달라지는 작업을 시뮬레이션합니다. 또한 테스트 메서드는 1초 동안 기다린 다음 타이머를 중지하는 컨트롤 스레드를 시작합니다. 컨트롤 스레드가 타이머를 중지할 때 이벤트가 처리되는 경우 제어 스레드는 계속하기 전에 이벤트가 완료될 때까지 기다려야 합니다.
Interlocked.CompareExchange(Int32, Int32, Int32) 메서드 오버로드는 재진입을 방지하고 실행 이벤트가 종료될 때까지 컨트롤 스레드가 계속되지 않도록 하는 데 사용됩니다. 이벤트 처리기는 메서드를 CompareExchange(Int32, Int32, Int32) 사용하여 컨트롤 변수를 1로 설정하지만 값이 현재 0인 경우에만 설정합니다. 원자성 연산입니다. 반환 값이 0이면 컨트롤 변수가 1로 설정되고 이벤트 처리기가 진행됩니다. 반환 값이 0이 아닌 경우 이벤트는 재진입을 방지하기 위해 단순히 삭제됩니다. (모든 이벤트를 실행해야 하는 경우 클래스는 Monitor 이벤트를 동기화하는 더 나은 방법이 될 것입니다.) 이벤트 처리기가 종료되면 컨트롤 변수를 다시 0으로 설정합니다. 이 예제에서는 실행된 총 이벤트 수, 재진입으로 인해 삭제된 이벤트 및 메서드가 호출된 후에 Stop 발생한 총 이벤트 수를 기록합니다.
컨트롤 스레드는 메서드를 CompareExchange(Int32, Int32, Int32) 사용하여 컨트롤 변수를 -1(빼기 1)로 설정하지만 값이 현재 0인 경우에만 설정합니다. 원자성 연산이 0이 아닌 값을 반환하는 경우 이벤트가 현재 실행되고 있습니다. 컨트롤 스레드가 대기하고 다시 시도합니다. 이 예제에서는 컨트롤 스레드가 이벤트가 완료되기를 기다려야 하는 횟수를 기록합니다.
using System;
using System.Timers;
using System.Threading;
public class Test
{
// Change these values to control the behavior of the program.
private static int testRuns = 100;
// Times are given in milliseconds:
private static int testRunsFor = 500;
private static int timerIntervalBase = 100;
private static int timerIntervalDelta = 20;
// Timers.
private static System.Timers.Timer Timer1 = new System.Timers.Timer();
private static System.Timers.Timer Timer2 = new System.Timers.Timer();
private static System.Timers.Timer currentTimer = null;
private static Random rand = new Random();
// This is the synchronization point that prevents events
// from running concurrently, and prevents the main thread
// from executing code after the Stop method until any
// event handlers are done executing.
private static int syncPoint = 0;
// Count the number of times the event handler is called,
// is executed, is skipped, or is called after Stop.
private static int numEvents = 0;
private static int numExecuted = 0;
private static int numSkipped = 0;
private static int numLate = 0;
// Count the number of times the thread that calls Stop
// has to wait for an Elapsed event to finish.
private static int numWaits = 0;
[MTAThread]
public static void Main()
{
Timer1.Elapsed += new ElapsedEventHandler(Timer1_ElapsedEventHandler);
Timer2.Elapsed += new ElapsedEventHandler(Timer2_ElapsedEventHandler);
Console.WriteLine();
for(int i = 1; i <= testRuns; i++)
{
TestRun();
Console.Write("\rTest {0}/{1} ", i, testRuns);
}
Console.WriteLine("{0} test runs completed.", testRuns);
Console.WriteLine("{0} events were raised.", numEvents);
Console.WriteLine("{0} events executed.", numExecuted);
Console.WriteLine("{0} events were skipped for concurrency.", numSkipped);
Console.WriteLine("{0} events were skipped because they were late.", numLate);
Console.WriteLine("Control thread waited {0} times for an event to complete.", numWaits);
}
public static void TestRun()
{
// Set syncPoint to zero before starting the test
// run.
syncPoint = 0;
// Test runs alternate between Timer1 and Timer2, to avoid
// race conditions between tests, or with very late events.
if (currentTimer == Timer1)
currentTimer = Timer2;
else
currentTimer = Timer1;
currentTimer.Interval = timerIntervalBase
- timerIntervalDelta + rand.Next(timerIntervalDelta * 2);
currentTimer.Enabled = true;
// Start the control thread that shuts off the timer.
Thread t = new Thread(ControlThreadProc);
t.Start();
// Wait until the control thread is done before proceeding.
// This keeps the test runs from overlapping.
t.Join();
}
private static void ControlThreadProc()
{
// Allow the timer to run for a period of time, and then
// stop it.
Thread.Sleep(testRunsFor);
currentTimer.Stop();
// The 'counted' flag ensures that if this thread has
// to wait for an event to finish, the wait only gets
// counted once.
bool counted = false;
// Ensure that if an event is currently executing,
// no further processing is done on this thread until
// the event handler is finished. This is accomplished
// by using CompareExchange to place -1 in syncPoint,
// but only if syncPoint is currently zero (specified
// by the third parameter of CompareExchange).
// CompareExchange returns the original value that was
// in syncPoint. If it was not zero, then there's an
// event handler running, and it is necessary to try
// again.
while (Interlocked.CompareExchange(ref syncPoint, -1, 0) != 0)
{
// Give up the rest of this thread's current time
// slice. This is a naive algorithm for yielding.
Thread.Sleep(1);
// Tally a wait, but don't count multiple calls to
// Thread.Sleep.
if (!counted)
{
numWaits += 1;
counted = true;
}
}
// Any processing done after this point does not conflict
// with timer events. This is the purpose of the call to
// CompareExchange. If the processing done here would not
// cause a problem when run concurrently with timer events,
// then there is no need for the extra synchronization.
}
// Event-handling methods for the Elapsed events of the two
// timers.
//
private static void Timer1_ElapsedEventHandler(object sender,
ElapsedEventArgs e)
{
HandleElapsed(sender, e);
}
private static void Timer2_ElapsedEventHandler(object sender,
ElapsedEventArgs e)
{
HandleElapsed(sender, e);
}
private static void HandleElapsed(object sender, ElapsedEventArgs e)
{
numEvents += 1;
// This example assumes that overlapping events can be
// discarded. That is, if an Elapsed event is raised before
// the previous event is finished processing, the second
// event is ignored.
//
// CompareExchange is used to take control of syncPoint,
// and to determine whether the attempt was successful.
// CompareExchange attempts to put 1 into syncPoint, but
// only if the current value of syncPoint is zero
// (specified by the third parameter). If another thread
// has set syncPoint to 1, or if the control thread has
// set syncPoint to -1, the current event is skipped.
// (Normally it would not be necessary to use a local
// variable for the return value. A local variable is
// used here to determine the reason the event was
// skipped.)
//
int sync = Interlocked.CompareExchange(ref syncPoint, 1, 0);
if (sync == 0)
{
// No other event was executing.
// The event handler simulates an amount of work
// lasting between 50 and 200 milliseconds, so that
// some events will overlap.
int delay = timerIntervalBase
- timerIntervalDelta / 2 + rand.Next(timerIntervalDelta);
Thread.Sleep(delay);
numExecuted += 1;
// Release control of syncPoint.
syncPoint = 0;
}
else
{
if (sync == 1) { numSkipped += 1; } else { numLate += 1; }
}
}
}
/* On a dual-processor computer, this code example produces
results similar to the following:
Test 100/100 100 test runs completed.
436 events were raised.
352 events executed.
84 events were skipped for concurrency.
0 events were skipped because they were late.
Control thread waited 77 times for an event to complete.
*/
open System
open System.Threading
// Change these values to control the behavior of the program.
let testRuns = 100
// Times are given in milliseconds:
let testRunsFor = 500
let timerIntervalBase = 100
let timerIntervalDelta = 20
// Timers.
let timer1 = new Timers.Timer()
let timer2 = new Timers.Timer()
let mutable currentTimer = Unchecked.defaultof<Timers.Timer>
let rand = Random()
// This is the synchronization point that prevents events
// from running concurrently, and prevents the main thread
// from executing code after the Stop method until any
// event handlers are done executing.
let mutable syncPoint = 0
// Count the number of times the event handler is called,
// is executed, is skipped, or is called after Stop.
let mutable numEvents = 0
let mutable numExecuted = 0
let mutable numSkipped = 0
let mutable numLate = 0
// Count the number of times the thread that calls Stop
// has to wait for an Elapsed event to finish.
let mutable numWaits = 0
let controlThreadProc () =
// Allow the timer to run for a period of time, and then
// stop it.
Thread.Sleep testRunsFor
currentTimer.Stop()
// The 'counted' flag ensures that if this thread has
// to wait for an event to finish, the wait only gets
// counted once.
let mutable counted = false
// Ensure that if an event is currently executing,
// no further processing is done on this thread until
// the event handler is finished. This is accomplished
// by using CompareExchange to place -1 in syncPoint,
// but only if syncPoint is currently zero (specified
// by the third parameter of CompareExchange).
// CompareExchange returns the original value that was
// in syncPoint. If it was not zero, then there's an
// event handler running, and it is necessary to try
// again.
while Interlocked.CompareExchange(&syncPoint, -1, 0) <> 0 do
// Give up the rest of this thread's current time
// slice. This is a naive algorithm for yielding.
Thread.Sleep 1
// Tally a wait, but don't count multiple calls to
// Thread.Sleep.
if not counted then
numWaits <- numWaits + 1
counted <- true
// Any processing done after this point does not conflict
// with timer events. This is the purpose of the call to
// CompareExchange. If the processing done here would not
// cause a problem when run concurrently with timer events,
// then there is no need for the extra synchronization.
let testRun () =
// Set syncPoint to zero before starting the test
// run.
syncPoint <- 0
// Test runs alternate between Timer1 and Timer2, to avoid
// race conditions between tests, or with very late events.
if currentTimer = timer1 then
currentTimer <- timer2
else
currentTimer <- timer1
currentTimer.Interval <-
timerIntervalBase - timerIntervalDelta + (timerIntervalDelta * 2 |> rand.Next)
|> float
currentTimer.Enabled <- true
// Start the control thread that shuts off the timer.
let t = new Thread(ThreadStart controlThreadProc)
t.Start()
// Wait until the control thread is done before proceeding.
// This keeps the test runs from overlapping.
t.Join()
let handleElapsed sender e =
numEvents <- numEvents + 1
// This example assumes that overlapping events can be
// discarded. That is, if an Elapsed event is raised before
// the previous event is finished processing, the second
// event is ignored.
//
// CompareExchange is used to take control of syncPoint,
// and to determine whether the attempt was successful.
// CompareExchange attempts to put 1 into syncPoint, but
// only if the current value of syncPoint is zero
// (specified by the third parameter). If another thread
// has set syncPoint to 1, or if the control thread has
// set syncPoint to -1, the current event is skipped.
// (Normally it would not be necessary to use a local
// variable for the return value. A local variable is
// used here to determine the reason the event was
// skipped.)
//
let sync = Interlocked.CompareExchange(&syncPoint, 1, 0)
if sync = 0 then
// No other event was executing.
// The event handler simulates an amount of work
// lasting between 50 and 200 milliseconds, so that
// some events will overlap.
timerIntervalBase - timerIntervalDelta / 2 + rand.Next timerIntervalDelta
|> Thread.Sleep
numExecuted <- numExecuted + 1
// Release control of syncPoint.
syncPoint <- 0
else if sync = 1 then
numSkipped <- numSkipped + 1
else
numLate <- numLate + 1
// Event-handling methods for the Elapsed events of the two
// timers.
let timer1_ElapsedEventHandler = handleElapsed
let timer2_ElapsedEventHandler = handleElapsed
[<EntryPoint; MTAThread>]
let main _ =
timer1.Elapsed.AddHandler timer1_ElapsedEventHandler
timer2.Elapsed.AddHandler timer2_ElapsedEventHandler
printfn ""
for i = 1 to testRuns do
testRun ()
printf $"\rTest {i}/{testRuns} "
printfn $"{testRuns} test runs completed."
printfn $"{numEvents} events were raised."
printfn $"{numExecuted} events executed."
printfn $"{numSkipped} events were skipped for concurrency."
printfn $"{numLate} events were skipped because they were late."
printfn $"Control thread waited {numWaits} times for an event to complete."
0
// On a dual-processor computer, this code example produces
// results similar to the following:
// Test 100/100 100 test runs completed.
// 436 events were raised.
// 352 events executed.
// 84 events were skipped for concurrency.
// 0 events were skipped because they were late.
// Control thread waited 77 times for an event to complete.
Imports System.Timers
Imports System.Threading
Public Module Test
' Change these values to control the behavior of the program.
Private testRuns As Integer = 100
' Times are given in milliseconds:
Private testRunsFor As Integer = 500
Private timerIntervalBase As Integer = 100
Private timerIntervalDelta As Integer = 20
' Timers.
Private WithEvents Timer1 As New System.Timers.Timer
Private WithEvents Timer2 As New System.Timers.Timer
Private currentTimer As System.Timers.timer
Private rand As New Random()
' This is the synchronization point that prevents events
' from running concurrently, and prevents the main thread
' from executing code after the Stop method until any
' event handlers are done executing.
Private syncPoint As Integer = 0
' Count the number of times the event handler is called,
' is executed, is skipped, or is called after Stop.
Private numEvents As Integer = 0
Private numExecuted As Integer = 0
Private numSkipped As Integer = 0
Private numLate As Integer = 0
' Count the number of times the thread that calls Stop
' has to wait for an Elapsed event to finish.
Private numWaits As Integer = 0
<MTAThread> _
Sub Main()
Console.WriteLine()
For i As Integer = 1 To testRuns
TestRun
Console.Write(vbCr & "Test {0}/{1} ", i, testRuns)
Next
Console.WriteLine("{0} test runs completed.", testRuns)
Console.WriteLine("{0} events were raised.", numEvents)
Console.WriteLine("{0} events executed.", numExecuted)
Console.WriteLine("{0} events were skipped for concurrency.", numSkipped)
Console.WriteLine("{0} events were skipped because they were late.", numLate)
Console.WriteLine("Control thread waited {0} times for an event to complete.", numWaits)
End Sub
Sub TestRun()
' Set syncPoint to zero before starting the test
' run.
syncPoint = 0
' Test runs alternate between Timer1 and Timer2, to avoid
' race conditions between tests, or with very late events.
If currentTimer Is Timer1 Then
currentTimer = Timer2
Else
currentTimer = Timer1
End If
currentTimer.Interval = timerIntervalBase _
- timerIntervalDelta + rand.Next(timerIntervalDelta * 2)
currentTimer.Enabled = True
' Start the control thread that shuts off the timer.
Dim t As New Thread(AddressOf ControlThreadProc)
t.Start()
' Wait until the control thread is done before proceeding.
' This keeps the test runs from overlapping.
t.Join()
End Sub
Private Sub ControlThreadProc()
' Allow the timer to run for a period of time, and then
' stop it.
Thread.Sleep(testRunsFor)
currentTimer.Stop
' The 'counted' flag ensures that if this thread has
' to wait for an event to finish, the wait only gets
' counted once.
Dim counted As Boolean = False
' Ensure that if an event is currently executing,
' no further processing is done on this thread until
' the event handler is finished. This is accomplished
' by using CompareExchange to place -1 in syncPoint,
' but only if syncPoint is currently zero (specified
' by the third parameter of CompareExchange).
' CompareExchange returns the original value that was
' in syncPoint. If it was not zero, then there's an
' event handler running, and it is necessary to try
' again.
While Interlocked.CompareExchange(syncPoint, -1, 0) <> 0
' Give up the rest of this thread's current time
' slice. This is a naive algorithm for yielding.
Thread.Sleep(1)
' Tally a wait, but don't count multiple calls to
' Thread.Sleep.
If Not counted Then
numWaits += 1
counted = True
End If
End While
' Any processing done after this point does not conflict
' with timer events. This is the purpose of the call to
' CompareExchange. If the processing done here would not
' cause a problem when run concurrently with timer events,
' then there is no need for the extra synchronization.
End Sub
' Event-handling methods for the Elapsed events of the two
' timers.
'
Private Sub Timer1_ElapsedEventHandler(ByVal sender As Object, _
ByVal e As ElapsedEventArgs) Handles Timer1.Elapsed
HandleElapsed(sender, e)
End Sub
Private Sub Timer2_ElapsedEventHandler(ByVal sender As Object, _
ByVal e As ElapsedEventArgs) Handles Timer2.Elapsed
HandleElapsed(sender, e)
End Sub
Private Sub HandleElapsed(ByVal sender As Object, ByVal e As ElapsedEventArgs)
numEvents += 1
' This example assumes that overlapping events can be
' discarded. That is, if an Elapsed event is raised before
' the previous event is finished processing, the second
' event is ignored.
'
' CompareExchange is used to take control of syncPoint,
' and to determine whether the attempt was successful.
' CompareExchange attempts to put 1 into syncPoint, but
' only if the current value of syncPoint is zero
' (specified by the third parameter). If another thread
' has set syncPoint to 1, or if the control thread has
' set syncPoint to -1, the current event is skipped.
' (Normally it would not be necessary to use a local
' variable for the return value. A local variable is
' used here to determine the reason the event was
' skipped.)
'
Dim sync As Integer = Interlocked.CompareExchange(syncPoint, 1, 0)
If sync = 0 Then
' No other event was executing.
' The event handler simulates an amount of work
' similar to the time between events, so that
' some events will overlap.
Dim delay As Integer = timerIntervalBase _
- timerIntervalDelta / 2 + rand.Next(timerIntervalDelta)
Thread.Sleep(delay)
numExecuted += 1
' Release control of syncPoint.
syncPoint = 0
Else
If sync = 1 Then numSkipped += 1 Else numLate += 1
End If
End Sub
End Module
' On a dual-processor computer, this code example produces
' results similar to the following:
'
'Test 100/100 100 test runs completed.
'436 events were raised.
'352 events executed.
'84 events were skipped for concurrency.
'0 events were skipped because they were late.
'Control thread waited 77 times for an event to complete.
설명
을 로 설정 Enabled 하여 타이밍을 중지할 false수도 있습니다.
참고
이벤트를 발생 Elapsed 시키는 신호는 항상 스레드에서 실행을 위해 큐에 ThreadPool 대기되므로 이벤트 처리 메서드는 메서드 호출이 Stop 다른 스레드에서 실행되는 동시에 한 스레드에서 실행될 수 있습니다. 이로 인해 메서드가 Elapsed 호출된 후 Stop 이벤트가 발생할 수 있습니다. 예제 섹션의 두 번째 코드 예제는 이 경합 상태를 해결하는 한 가지 방법을 보여 줍니다.
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