Thread.FreeNamedDataSlot(String) Thread.FreeNamedDataSlot(String) Thread.FreeNamedDataSlot(String) Thread.FreeNamedDataSlot(String) Method

Определение

Удаляет связь между названием и областью для всех потоков в процессе.Eliminates the association between a name and a slot, for all threads in the process. Для улучшения производительности используйте поля, отмеченные атрибутом ThreadStaticAttribute.For better performance, use fields that are marked with the ThreadStaticAttribute attribute instead.

public:
 static void FreeNamedDataSlot(System::String ^ name);
public static void FreeNamedDataSlot (string name);
static member FreeNamedDataSlot : string -> unit
Public Shared Sub FreeNamedDataSlot (name As String)

Параметры

name
String String String String

Имя освобождаемой области данных.The name of the data slot to be freed.

Примеры

Этот раздел содержит два примера кода.This section contains two code examples. В первом примере показано, как использовать поле, помеченное ThreadStaticAttribute атрибутом для хранения информации, относящейся к конкретному потоку.The first example shows how to use a field that is marked with the ThreadStaticAttribute attribute to hold thread-specific information. Во втором примере показано, как использовать область данных для того, чтобы сделать то же самое.The second example shows how to use a data slot to do the same thing.

Первый примерFirst Example

В следующем примере показано, как использовать поле, помеченное ThreadStaticAttribute как, чтобы хранить сведения о конкретном потоке.The following example shows how to use a field that is marked with ThreadStaticAttribute to hold thread-specific information. Этот метод обеспечивает лучшую производительность, чем метод, показанный во втором примере.This technique provides better performance than the technique that is shown in the second example.

using namespace System;
using namespace System::Threading;

ref class ThreadData
{
private:
   [ThreadStatic]
   static int threadSpecificData;

public:
   static void ThreadStaticDemo()
   {
      // Store the managed thread id for each thread in the static
      // variable.
      threadSpecificData = Thread::CurrentThread->ManagedThreadId;
      
      // Allow other threads time to execute the same code, to show
      // that the static data is unique to each thread.
      Thread::Sleep( 1000 );

      // Display the static data.
      Console::WriteLine( "Data for managed thread {0}: {1}", 
         Thread::CurrentThread->ManagedThreadId, threadSpecificData );
   }
};

int main()
{
   for ( int i = 0; i < 3; i++ )
   {
      Thread^ newThread = 
          gcnew Thread( gcnew ThreadStart( ThreadData::ThreadStaticDemo )); 
      newThread->Start();
   }
}

/* This code example produces output similar to the following:

Data for managed thread 4: 4
Data for managed thread 5: 5
Data for managed thread 3: 3
 */
using System;
using System.Threading;

class Test
{
    static void Main()
    {
        for(int i = 0; i < 3; i++)
        {
            Thread newThread = new Thread(ThreadData.ThreadStaticDemo);
            newThread.Start();
        }
    }
}

class ThreadData
{
    [ThreadStatic]
    static int threadSpecificData;

    public static void ThreadStaticDemo()
    {
        // Store the managed thread id for each thread in the static
        // variable.
        threadSpecificData = Thread.CurrentThread.ManagedThreadId;
      
        // Allow other threads time to execute the same code, to show
        // that the static data is unique to each thread.
        Thread.Sleep( 1000 );

        // Display the static data.
        Console.WriteLine( "Data for managed thread {0}: {1}", 
            Thread.CurrentThread.ManagedThreadId, threadSpecificData );
    }
}

/* This code example produces output similar to the following:

Data for managed thread 4: 4
Data for managed thread 5: 5
Data for managed thread 3: 3
 */
Imports System
Imports System.Threading

Class Test

    <MTAThread> _
    Shared Sub Main()

        For i As Integer = 1 To 3
            Dim newThread As New Thread(AddressOf ThreadData.ThreadStaticDemo)
            newThread.Start()
        Next i

    End Sub

End Class

Class ThreadData

    <ThreadStatic> _
    Shared threadSpecificData As Integer

    Shared Sub ThreadStaticDemo()

        ' Store the managed thread id for each thread in the static
        ' variable.
        threadSpecificData = Thread.CurrentThread.ManagedThreadId
      
        ' Allow other threads time to execute the same code, to show
        ' that the static data is unique to each thread.
        Thread.Sleep( 1000 )

        ' Display the static data.
        Console.WriteLine( "Data for managed thread {0}: {1}", _
            Thread.CurrentThread.ManagedThreadId, threadSpecificData )

    End Sub

End Class

' This code example produces output similar to the following:
'
'Data for managed thread 4: 4
'Data for managed thread 5: 5
'Data for managed thread 3: 3

Второй примерSecond Example

В следующем примере показано, как использовать именованную область данных для хранения сведений о конкретном потоке.The following example demonstrates how to use a named data slot to store thread-specific information.

using namespace System;
using namespace System::Threading;

ref class Slot
{
private:
    static Random^ randomGenerator = gcnew Random();

public:
    static void SlotTest()
    {
        // Set random data in each thread's data slot.
        int slotData = randomGenerator->Next(1, 200);
        int threadId = Thread::CurrentThread->ManagedThreadId;

        Thread::SetData(
            Thread::GetNamedDataSlot("Random"),
            slotData);

        // Show what was saved in the thread's data slot.
        Console::WriteLine("Data stored in thread_{0}'s data slot: {1,3}",
            threadId, slotData);

        // Allow other threads time to execute SetData to show
        // that a thread's data slot is unique to itself.
        Thread::Sleep(1000);

        int newSlotData =
            (int)Thread::GetData(Thread::GetNamedDataSlot("Random"));

        if (newSlotData == slotData)
        {
            Console::WriteLine("Data in thread_{0}'s data slot is still: {1,3}",
                threadId, newSlotData);
        }
        else
        {
            Console::WriteLine("Data in thread_{0}'s data slot changed to: {1,3}",
                threadId, newSlotData);
        }
    }
};

ref class Test
{
public:
    static void Main()
    {
        array<Thread^>^ newThreads = gcnew array<Thread^>(4);
        int i;
        for (i = 0; i < newThreads->Length; i++)
        {
            newThreads[i] =
                gcnew Thread(gcnew ThreadStart(&Slot::SlotTest));
            newThreads[i]->Start();
        }
        Thread::Sleep(2000);
        for (i = 0; i < newThreads->Length; i++)
        {
            newThreads[i]->Join();
            Console::WriteLine("Thread_{0} finished.",
                newThreads[i]->ManagedThreadId);
        }
    }
};

int main()
{
    Test::Main();
}
using System;
using System.Threading;

class Test
{
    public static void Main()
    {
        Thread[] newThreads = new Thread[4];
        int i;
        for (i = 0; i < newThreads.Length; i++)
        {
            newThreads[i] =
                new Thread(new ThreadStart(Slot.SlotTest));
            newThreads[i].Start();
        }
        Thread.Sleep(2000);
        for (i = 0; i < newThreads.Length; i++)
        {
            newThreads[i].Join();
            Console.WriteLine("Thread_{0} finished.",
                newThreads[i].ManagedThreadId);
        }
    }
}

class Slot
{
    private static Random randomGenerator = new Random();

    public static void SlotTest()
    {
        // Set random data in each thread's data slot.
        int slotData = randomGenerator.Next(1, 200);
        int threadId = Thread.CurrentThread.ManagedThreadId;

        Thread.SetData(
            Thread.GetNamedDataSlot("Random"),
            slotData);

        // Show what was saved in the thread's data slot.
        Console.WriteLine("Data stored in thread_{0}'s data slot: {1,3}",
            threadId, slotData);

        // Allow other threads time to execute SetData to show
        // that a thread's data slot is unique to itself.
        Thread.Sleep(1000);

        int newSlotData =
            (int)Thread.GetData(Thread.GetNamedDataSlot("Random"));

        if (newSlotData == slotData)
        {
            Console.WriteLine("Data in thread_{0}'s data slot is still: {1,3}",
                threadId, newSlotData);
        }
        else
        {
            Console.WriteLine("Data in thread_{0}'s data slot changed to: {1,3}",
                threadId, newSlotData);
        }
    }
}
Imports System
Imports System.Threading

Class Test
    Public Shared Sub Main()
        Dim newThreads(3) As Thread
        Dim i As Integer
        For i = 0 To newThreads.Length - 1
            newThreads(i) = _
                New Thread(New ThreadStart(AddressOf Slot.SlotTest))
            newThreads(i).Start()
        Next i
        Thread.Sleep(2000)
        For i = 0 To newThreads.Length - 1
            newThreads(i).Join()
            Console.WriteLine("Thread_{0} finished.", _
                newThreads(i).ManagedThreadId)
        Next i
    End Sub
End Class

Class Slot
    Private Shared randomGenerator As New Random()

    Public Shared Sub SlotTest()
        ' Set random data in each thread's data slot.
        Dim slotData As Integer = randomGenerator.Next(1, 200)
        Dim threadId As Integer = Thread.CurrentThread.ManagedThreadId

        Thread.SetData(
            Thread.GetNamedDataSlot("Random"),
            slotData)

        ' Show what was saved in the thread's data slot.
        Console.WriteLine("Data stored in thread_{0}'s data slot: {1,3}",
            threadId, slotData)

        ' Allow other threads time to execute SetData to show
        ' that a thread's data slot is unique to itself.
        Thread.Sleep(1000)

        Dim newSlotData As Integer = _
            CType(Thread.GetData(Thread.GetNamedDataSlot("Random")), Integer)

        If newSlotData = slotData Then
            Console.WriteLine("Data in thread_{0}'s data slot is still: {1,3}",
                threadId, newSlotData)
        Else
            Console.WriteLine("Data in thread_{0}'s data slot changed to: {1,3}",
                threadId, newSlotData)
        End If
    End Sub
End Class

Комментарии

Важно!

.NET Framework предоставляет два механизма использования локального хранилища потока (TLS): статические поля потока (поля, помеченные ThreadStaticAttribute атрибутом) и области данных.The .NET Framework provides two mechanisms for using thread local storage (TLS): thread-relative static fields (that is, fields that are marked with the ThreadStaticAttribute attribute) and data slots. Статические поля потоков обеспечивают гораздо лучшую производительность, чем области данных, и обеспечивают проверку типов во время компиляции.Thread-relative static fields provide much better performance than data slots, and enable compile-time type checking. Дополнительные сведения об использовании TLS см. в разделе локальное хранилище потока: Статические поля, связанные с потоком,и области данных.For more information about using TLS, see Thread Local Storage: Thread-Relative Static Fields and Data Slots.

После любого вызова FreeNamedDataSlotпотока любой другой поток, вызывающий GetNamedDataSlot с тем же именем, будет выделять новый слот, связанный с именем.After any thread calls FreeNamedDataSlot, any other thread that calls GetNamedDataSlot with the same name will allocate a new slot associated with the name. Последующие вызовы GetNamedDataSlot с помощью любого потока будут возвращать новый слот.Subsequent calls to GetNamedDataSlot by any thread will return the new slot. Однако любой поток, который по-прежнему System.LocalDataStoreSlot имеет значение, возвращенное предыдущим GetNamedDataSlot вызовом метода, может продолжать использовать старый слот.However, any thread that still has a System.LocalDataStoreSlot returned by an earlier call to GetNamedDataSlot can continue to use the old slot.

Слот, связанный с именем, освобождается только в том случае, если LocalDataStoreSlot все, что было получено перед FreeNamedDataSlot вызовом, освобождено и собрано сборщиком мусора.A slot that has been associated with a name is released only when every LocalDataStoreSlot that was obtained prior to the call to FreeNamedDataSlot has been released and garbage-collected.

Потоки используют механизм локальной памяти хранилища для хранения данных конкретного потока.Threads use a local store memory mechanism to store thread-specific data. Среда CLR выделяет массив хранилища данных с несколькими слотами каждому процессу при его создании.The common language runtime allocates a multi-slot data store array to each process when it is created. Поток может выделить область данных в хранилище данных, сохранить и извлечь значение данных в слоте и освободить слот для повторного использования после истечения срока действия потока.The thread can allocate a data slot in the data store, store and retrieve a data value in the slot, and free the slot for reuse after the thread expires. Области данных являются уникальными для каждого потока.Data slots are unique per thread. Ни один другой поток (даже не дочерний поток) не может получить эти данные.No other thread (not even a child thread) can get that data.

Применяется к

Дополнительно