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Thread.Join Método

  • Referência

Definição

Namespace:
System.Threading
Assembly:
System.Threading.Thread.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll

Bloqueia o thread de chamada até que o thread representado por esta instância seja encerrado.

Sobrecargas

Join()

Bloqueia o thread de chamada até que o thread representado por essa instância termine, enquanto continua a executar COM padrão e o bombeamento de SendMessage.
Join(Int32)

Bloqueia o thread de chamada até que o thread representado por essa instância termine ou até que o tempo especificado tenha decorrido, enquanto continua executando o COM padrão e o bombeamento de SendMessage.
Join(TimeSpan)

Bloqueia o thread de chamada até que o thread representado por essa instância termine ou até que o tempo especificado tenha decorrido, enquanto continua executando o COM padrão e o bombeamento de SendMessage.

Join()

Origem:
Thread.cs
Origem:
Thread.cs
Origem:
Thread.cs

Bloqueia o thread de chamada até que o thread representado por essa instância termine, enquanto continua a executar COM padrão e o bombeamento de SendMessage.

public:
 void Join();
public void Join ();
member this.Join : unit -> unit
Public Sub Join ()

Exceções

ThreadStateException

O chamador tentou ingressar em um thread que está no estado Unstarted.

ThreadInterruptedException

O thread é interrompido enquanto espera.

Comentários

Join é um método de sincronização que bloqueia o thread de chamada (ou seja, o thread que chama o método) até que o thread cujo Join método é chamado seja concluído. Use esse método para garantir que um thread tenha sido encerrado. O chamador será bloqueado indefinidamente se o thread não for encerrado. No exemplo a seguir, o Thread1 thread chama o Join() método de Thread2, que faz Thread1 com que seja bloqueado até Thread2 que seja concluído.

using System;
using System.Threading;

public class Example
{
   static Thread thread1, thread2;
   
   public static void Main()
   {
      thread1 = new Thread(ThreadProc);
      thread1.Name = "Thread1";
      thread1.Start();
      
      thread2 = new Thread(ThreadProc);
      thread2.Name = "Thread2";
      thread2.Start();   
   }

   private static void ThreadProc()
   {
      Console.WriteLine("\nCurrent thread: {0}", Thread.CurrentThread.Name);
      if (Thread.CurrentThread.Name == "Thread1" && 
          thread2.ThreadState != ThreadState.Unstarted)
         thread2.Join();
      
      Thread.Sleep(4000);
      Console.WriteLine("\nCurrent thread: {0}", Thread.CurrentThread.Name);
      Console.WriteLine("Thread1: {0}", thread1.ThreadState);
      Console.WriteLine("Thread2: {0}\n", thread2.ThreadState);
   }
}
// The example displays output like the following:
//       Current thread: Thread1
//       
//       Current thread: Thread2
//       
//       Current thread: Thread2
//       Thread1: WaitSleepJoin
//       Thread2: Running
//       
//       
//       Current thread: Thread1
//       Thread1: Running
//       Thread2: Stopped

open System.Threading

let mutable thread1, thread2 =
    Unchecked.defaultof<Thread>, Unchecked.defaultof<Thread>

let threadProc () =
    printfn $"\nCurrent thread: {Thread.CurrentThread.Name}"

    if
        Thread.CurrentThread.Name = "Thread1"
        && thread2.ThreadState <> ThreadState.Unstarted
    then
        thread2.Join()

    Thread.Sleep 4000
    printfn $"\nCurrent thread: {Thread.CurrentThread.Name}"
    printfn $"Thread1: {thread1.ThreadState}"
    printfn $"Thread2: {thread2.ThreadState}\n"

thread1 <- Thread threadProc
thread1.Name <- "Thread1"
thread1.Start()

thread2 <- Thread threadProc
thread2.Name <- "Thread2"
thread2.Start()

// The example displays output like the following:
//       Current thread: Thread1
//
//       Current thread: Thread2
//
//       Current thread: Thread2
//       Thread1: WaitSleepJoin
//       Thread2: Running
//
//
//       Current thread: Thread1
//       Thread1: Running
//       Thread2: Stopped

Imports System.Threading

Module Example
   Dim thread1, thread2 As Thread

   Public Sub Main()
      thread1 = new Thread(AddressOf ThreadProc)
      thread1.Name = "Thread1"
      thread1.Start()
      
      thread2 = New Thread(AddressOf ThreadProc)
      thread2.Name = "Thread2"
      thread2.Start()   
   End Sub

   Private Sub ThreadProc()
      Console.WriteLine()
      Console.WriteLine("Current thread: {0}", Thread.CurrentThread.Name)
      If (Thread.CurrentThread.Name = "Thread1" And 
          thread2.ThreadState <> ThreadState.Unstarted)
         thread2.Join()
      End If
      Thread.Sleep(4000)
      Console.WriteLine()
      Console.WriteLine("Current thread: {0}", Thread.CurrentThread.Name)
      Console.WriteLine("Thread1: {0}", thread1.ThreadState)
      Console.WriteLine("Thread2: {0}", thread2.ThreadState)
      Console.WriteLine()
   End Sub
End Module
' The example displays output like the following :
'       Current thread: Thread1
'       
'       Current thread: Thread2
'       
'       Current thread: Thread2
'       Thread1: WaitSleepJoin
'       Thread2: Running
'       
'       
'       Current thread: Thread1
'       Thread1: Running
'       Thread2: Stopped

Se o thread já tiver terminado quando Join for chamado, o método retornará imediatamente.

Aviso

Você nunca deve chamar o Join método do Thread objeto que representa o thread atual do thread atual. Isso faz com que seu aplicativo fique sem resposta porque o thread atual aguarda por si mesmo indefinidamente,

Esse método altera o estado do thread de chamada para incluir ThreadState.WaitSleepJoin. Você não pode invocar Join em um thread que está no ThreadState.Unstarted estado .

Confira também

Aplica-se a

Join(Int32)

Origem:
Thread.cs
Origem:
Thread.cs
Origem:
Thread.cs

Bloqueia o thread de chamada até que o thread representado por essa instância termine ou até que o tempo especificado tenha decorrido, enquanto continua executando o COM padrão e o bombeamento de SendMessage.

public:
 bool Join(int millisecondsTimeout);
public bool Join (int millisecondsTimeout);
member this.Join : int -> bool
Public Function Join (millisecondsTimeout As Integer) As Boolean

Parâmetros

millisecondsTimeout
Int32

O número de milissegundos para espera pelo encerramento do thread.

Retornos

Boolean

true se o thread tiver sido encerrado; false se o thread não tiver sido encerrado depois que o tempo especificado pelo parâmetro millisecondsTimeout tiver decorrido.

Exceções

ArgumentOutOfRangeException

O valor de millisecondsTimeout será negativo e não será igual a Infinite em milissegundos.

ThreadStateException

O thread não foi iniciado.

ArgumentException

millisecondsTimeout é menor que -1 (Timeout.Infinite).

ThreadInterruptedException

O thread foi interrompido enquanto espera.

Comentários

Join(Int32) é um método de sincronização que bloqueia o thread de chamada (ou seja, o thread que chama o método) até que o thread cujo Join método é chamado tenha sido concluído ou o intervalo de tempo limite tenha decorrido. No exemplo a seguir, o Thread1 thread chama o Join() método de Thread2, o que faz Thread1 com que seja bloqueado até Thread2 que tenha sido concluído ou 2 segundos tenham decorrido.

using System;
using System.Threading;

public class Example
{
   static Thread thread1, thread2;
   
   public static void Main()
   {
      thread1 = new Thread(ThreadProc);
      thread1.Name = "Thread1";
      thread1.Start();
      
      thread2 = new Thread(ThreadProc);
      thread2.Name = "Thread2";
      thread2.Start();   
   }

   private static void ThreadProc()
   {
      Console.WriteLine("\nCurrent thread: {0}", Thread.CurrentThread.Name);
      if (Thread.CurrentThread.Name == "Thread1" && 
          thread2.ThreadState != ThreadState.Unstarted)
         if (thread2.Join(2000))
            Console.WriteLine("Thread2 has termminated.");
         else
            Console.WriteLine("The timeout has elapsed and Thread1 will resume.");   
      
      Thread.Sleep(4000);
      Console.WriteLine("\nCurrent thread: {0}", Thread.CurrentThread.Name);
      Console.WriteLine("Thread1: {0}", thread1.ThreadState);
      Console.WriteLine("Thread2: {0}\n", thread2.ThreadState);
   }
}
// The example displays the following output:
//       Current thread: Thread1
//       
//       Current thread: Thread2
//       The timeout has elapsed and Thread1 will resume.
//       
//       Current thread: Thread2
//       Thread1: WaitSleepJoin
//       Thread2: Running
//       
//       
//       Current thread: Thread1
//       Thread1: Running
//       Thread2: Stopped

open System.Threading

let mutable thread1, thread2 =
    Unchecked.defaultof<Thread>, Unchecked.defaultof<Thread>

let threadProc () =
    printfn $"\nCurrent thread: {Thread.CurrentThread.Name}"

    if
        Thread.CurrentThread.Name = "Thread1"
        && thread2.ThreadState <> ThreadState.Unstarted
    then
        if thread2.Join 2000 then
            printfn "Thread2 has termminated."
        else
            printfn "The timeout has elapsed and Thread1 will resume."

    Thread.Sleep 4000
    printfn $"\nCurrent thread: {Thread.CurrentThread.Name}"
    printfn $"Thread1: {thread1.ThreadState}"
    printfn $"Thread2: {thread2.ThreadState}\n"

thread1 <- Thread threadProc
thread1.Name <- "Thread1"
thread1.Start()

thread2 <- Thread threadProc
thread2.Name <- "Thread2"
thread2.Start()

// The example displays the following output:
//       Current thread: Thread1
//
//       Current thread: Thread2
//       The timeout has elapsed and Thread1 will resume.
//
//       Current thread: Thread2
//       Thread1: WaitSleepJoin
//       Thread2: Running
//
//
//       Current thread: Thread1
//       Thread1: Running
//       Thread2: Stopped

Imports System.Threading

Module Example
   Dim thread1, thread2 As Thread

   Public Sub Main()
      thread1 = new Thread(AddressOf ThreadProc)
      thread1.Name = "Thread1"
      thread1.Start()
      
      thread2 = New Thread(AddressOf ThreadProc)
      thread2.Name = "Thread2"
      thread2.Start()   
   End Sub

   Private Sub ThreadProc()
      Console.WriteLine()
      Console.WriteLine("Current thread: {0}", Thread.CurrentThread.Name)
      If (Thread.CurrentThread.Name = "Thread1" And 
          thread2.ThreadState <> ThreadState.Unstarted)
         If thread2.Join(TimeSpan.FromSeconds(2))
            Console.WriteLine("Thread2 has termminated.")
         Else
            Console.WriteLine("The timeout has elapsed and Thread1 will resume.")
         End If      
      End If
      Thread.Sleep(4000)
      Console.WriteLine()
      Console.WriteLine("Current thread: {0}", Thread.CurrentThread.Name)
      Console.WriteLine("Thread1: {0}", thread1.ThreadState)
      Console.WriteLine("Thread2: {0}", thread2.ThreadState)
      Console.WriteLine()
   End Sub
End Module
' The example displays the following output:
'       Current thread: Thread1
'       
'       Current thread: Thread2
'       
'       Current thread: Thread2
'       Thread1: WaitSleepJoin
'       Thread2: Running
'       
'       
'       Current thread: Thread1
'       Thread1: Running
'       Thread2: Stopped

Se Timeout.Infinite for especificado para o millisecondsTimeout parâmetro , esse método se comportará de forma idêntica à sobrecarga do Join() método, exceto pelo valor retornado.

Se o thread já tiver terminado quando Join for chamado, o método retornará imediatamente.

Esse método altera o estado do thread de chamada para incluir ThreadState.WaitSleepJoin. Você não pode invocar Join em um thread que está no ThreadState.Unstarted estado .

Confira também

Aplica-se a

Join(TimeSpan)

Origem:
Thread.cs
Origem:
Thread.cs
Origem:
Thread.cs

Bloqueia o thread de chamada até que o thread representado por essa instância termine ou até que o tempo especificado tenha decorrido, enquanto continua executando o COM padrão e o bombeamento de SendMessage.

public:
 bool Join(TimeSpan timeout);
public bool Join (TimeSpan timeout);
member this.Join : TimeSpan -> bool
Public Function Join (timeout As TimeSpan) As Boolean

Parâmetros

timeout
TimeSpan

Um TimeSpan definido como a quantidade de tempo de espera até a conclusão do thread.

Retornos

Boolean

true se o thread tiver sido encerrado; false se o thread não tiver sido encerrado depois que o período especificado pelo parâmetro timeout tiver decorrido.

Exceções

ArgumentOutOfRangeException

O valor de timeout é negativo e não é igual a Infinite em milissegundos ou é maior que Int32.MaxValue milissegundos.

ThreadStateException

O chamador tentou ingressar em um thread que está no estado Unstarted.

Exemplos

O exemplo de código a seguir demonstra como usar um TimeSpan valor com o Join método .

using namespace System;
using namespace System::Threading;

static TimeSpan waitTime = TimeSpan(0,0,1);

ref class Test
{
public:
   static void Work()
   {
      Thread::Sleep( waitTime );
   }

};

int main()
{
   Thread^ newThread = gcnew Thread( gcnew ThreadStart( Test::Work ) );
   newThread->Start();
   if ( newThread->Join( waitTime + waitTime ) )
   {
      Console::WriteLine( "New thread terminated." );
   }
   else
   {
      Console::WriteLine( "Join timed out." );
   }
}
// The example displays the following output:
//        New thread terminated.

using System;
using System.Threading;

class Test
{
    static TimeSpan waitTime = new TimeSpan(0, 0, 1);

    public static void Main() 
    {
        Thread newThread = new Thread(Work);
        newThread.Start();

        if(newThread.Join(waitTime + waitTime)) {
            Console.WriteLine("New thread terminated.");
        }
        else {
            Console.WriteLine("Join timed out.");
        }
    }

    static void Work()
    {
        Thread.Sleep(waitTime);
    }
}
// The example displays the following output:
//        New thread terminated.

open System
open System.Threading

let waitTime = TimeSpan(0, 0, 1)

let work () =
    Thread.Sleep waitTime

let newThread = Thread work
newThread.Start()

if waitTime + waitTime |> newThread.Join then
    printfn "New thread terminated."
else
    printfn "Join timed out."

// The example displays the following output:
//        New thread terminated.

Imports System.Threading

Public Module Test
    Dim waitTime As New TimeSpan(0, 0, 1)

    Public Sub Main() 
        Dim newThread As New Thread(AddressOf Work)
        newThread.Start()

        If newThread.Join(waitTime + waitTime) Then
            Console.WriteLine("New thread terminated.")
        Else
            Console.WriteLine("Join timed out.")
        End If
    End Sub

    Private Sub Work()
        Thread.Sleep(waitTime)
    End Sub
End Module
' The example displays the following output:
'       New thread terminated.

Comentários

Join(TimeSpan) é um método de sincronização que bloqueia o thread de chamada (ou seja, o thread que chama o método) até que o thread cujo Join método é chamado tenha sido concluído ou o intervalo de tempo limite tenha decorrido. No exemplo a seguir, o Thread1 thread chama o Join() método de Thread2, o que faz Thread1 com que seja bloqueado até Thread2 que tenha sido concluído ou 2 segundos tenham decorrido.

using System;
using System.Threading;

public class Example
{
   static Thread thread1, thread2;
   
   public static void Main()
   {
      thread1 = new Thread(ThreadProc);
      thread1.Name = "Thread1";
      thread1.Start();
      
      thread2 = new Thread(ThreadProc);
      thread2.Name = "Thread2";
      thread2.Start();   
   }

   private static void ThreadProc()
   {
      Console.WriteLine("\nCurrent thread: {0}", Thread.CurrentThread.Name);
      if (Thread.CurrentThread.Name == "Thread1" && 
          thread2.ThreadState != ThreadState.Unstarted)
         if (thread2.Join(TimeSpan.FromSeconds(2)))
            Console.WriteLine("Thread2 has termminated.");
         else
            Console.WriteLine("The timeout has elapsed and Thread1 will resume.");   
      
      Thread.Sleep(4000);
      Console.WriteLine("\nCurrent thread: {0}", Thread.CurrentThread.Name);
      Console.WriteLine("Thread1: {0}", thread1.ThreadState);
      Console.WriteLine("Thread2: {0}\n", thread2.ThreadState);
   }
}
// The example displays the following output:
//       Current thread: Thread1
//       
//       Current thread: Thread2
//       The timeout has elapsed and Thread1 will resume.
//       
//       Current thread: Thread2
//       Thread1: WaitSleepJoin
//       Thread2: Running
//       
//       
//       Current thread: Thread1
//       Thread1: Running
//       Thread2: Stopped

open System
open System.Threading

let mutable thread1, thread2 =
    Unchecked.defaultof<Thread>, Unchecked.defaultof<Thread>

let threadProc () =
    printfn $"\nCurrent thread: {Thread.CurrentThread.Name}"

    if
        Thread.CurrentThread.Name = "Thread1"
        && thread2.ThreadState <> ThreadState.Unstarted
    then
        if TimeSpan.FromSeconds 2 |> thread2.Join then
            printfn "Thread2 has termminated."
        else
            printfn "The timeout has elapsed and Thread1 will resume."

    Thread.Sleep 4000
    printfn $"\nCurrent thread: {Thread.CurrentThread.Name}"
    printfn $"Thread1: {thread1.ThreadState}"
    printfn $"Thread2: {thread2.ThreadState}\n"

thread1 <- Thread threadProc
thread1.Name <- "Thread1"
thread1.Start()

thread2 <- Thread threadProc
thread2.Name <- "Thread2"
thread2.Start()

// The example displays the following output:
//       Current thread: Thread1
//
//       Current thread: Thread2
//       The timeout has elapsed and Thread1 will resume.
//
//       Current thread: Thread2
//       Thread1: WaitSleepJoin
//       Thread2: Running
//
//
//       Current thread: Thread1
//       Thread1: Running
//       Thread2: Stopped

Imports System.Threading

Module Example
   Dim thread1, thread2 As Thread

   Public Sub Main()
      thread1 = new Thread(AddressOf ThreadProc)
      thread1.Name = "Thread1"
      thread1.Start()
      
      thread2 = New Thread(AddressOf ThreadProc)
      thread2.Name = "Thread2"
      thread2.Start()   
   End Sub

   Private Sub ThreadProc()
      Console.WriteLine()
      Console.WriteLine("Current thread: {0}", Thread.CurrentThread.Name)
      If (Thread.CurrentThread.Name = "Thread1" And 
          thread2.ThreadState <> ThreadState.Unstarted)
         If thread2.Join(2000)
            Console.WriteLine("Thread2 has termminated.")
         Else
            Console.WriteLine("The timeout has elapsed and Thread1 will resume.")
         End If      
      End If
      Thread.Sleep(4000)
      Console.WriteLine()
      Console.WriteLine("Current thread: {0}", Thread.CurrentThread.Name)
      Console.WriteLine("Thread1: {0}", thread1.ThreadState)
      Console.WriteLine("Thread2: {0}", thread2.ThreadState)
      Console.WriteLine()
   End Sub
End Module
' The example displays the following output:
'       Current thread: Thread1
'       
'       Current thread: Thread2
'       
'       Current thread: Thread2
'       Thread1: WaitSleepJoin
'       Thread2: Running
'       
'       
'       Current thread: Thread1
'       Thread1: Running
'       Thread2: Stopped

Se Timeout.Infinite for especificado para timeout, esse método se comportará de forma idêntica à sobrecarga do Join() método, exceto pelo valor retornado.

Se o thread já tiver terminado quando Join for chamado, o método retornará imediatamente.

Esse método altera o estado do thread atual para incluir WaitSleepJoin. Você não pode invocar Join em um thread que está no ThreadState.Unstarted estado .

Confira também

Aplica-se a