Thread.AllocateDataSlot Metode
Definisi
Penting
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Mengalokasikan slot data yang tidak disebutkan namanya di semua utas. Untuk performa yang lebih baik, gunakan bidang yang ditandai dengan atribut sebagai gantinya ThreadStaticAttribute .
public:
static LocalDataStoreSlot ^ AllocateDataSlot();public static LocalDataStoreSlot AllocateDataSlot();static member AllocateDataSlot : unit -> LocalDataStoreSlotPublic Shared Function AllocateDataSlot () As LocalDataStoreSlotMengembalikan
Slot data bernama yang dialokasikan pada semua utas.
Contoh
Bagian ini berisi dua contoh kode. Contoh pertama menunjukkan cara menggunakan bidang yang ditandai dengan ThreadStaticAttribute atribut untuk menyimpan informasi khusus utas. Contoh kedua menunjukkan cara menggunakan slot data untuk melakukan hal yang sama.
Contoh Pertama
Contoh berikut menunjukkan cara menggunakan bidang yang ditandai dengan ThreadStaticAttribute untuk menyimpan informasi khusus utas. Teknik ini memberikan performa yang lebih baik daripada teknik yang ditunjukkan dalam contoh kedua.
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
*/
open System
open System.Threading
type ThreadData() =
// Create a static variable to hold the data for each thread.
[<ThreadStatic; DefaultValue>]
static val mutable private threadSpecificData : int
static member ThreadStaticDemo() =
// Store the managed thread id for each thread in the static
// variable.
ThreadData.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.
printfn $"Data for managed thread {Thread.CurrentThread.ManagedThreadId}: {ThreadData.threadSpecificData}"
for i = 0 to 2 do
let newThread = Thread 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
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
Contoh Kedua
Contoh kode berikut menunjukkan cara menggunakan slot data untuk menyimpan informasi khusus utas.
using System;
using System.Threading;
class Test
{
static void Main()
{
Thread[] newThreads = new Thread[4];
for(int i = 0; i < newThreads.Length; i++)
{
newThreads[i] = new Thread(
new ThreadStart(Slot.SlotTest));
newThreads[i].Start();
}
}
}
class Slot
{
static Random randomGenerator;
static LocalDataStoreSlot localSlot;
static Slot()
{
randomGenerator = new Random();
localSlot = Thread.AllocateDataSlot();
}
public static void SlotTest()
{
// Set different data in each thread's data slot.
Thread.SetData(localSlot, randomGenerator.Next(1, 200));
// Write the data from each thread's data slot.
Console.WriteLine("Data in thread_{0}'s data slot: {1,3}",
AppDomain.GetCurrentThreadId().ToString(),
Thread.GetData(localSlot).ToString());
// Allow other threads time to execute SetData to show
// that a thread's data slot is unique to the thread.
Thread.Sleep(1000);
Console.WriteLine("Data in thread_{0}'s data slot: {1,3}",
AppDomain.GetCurrentThreadId().ToString(),
Thread.GetData(localSlot).ToString());
}
}
open System
open System.Threading
module Slot =
let randomGenerator = Random()
let localSlot = Thread.AllocateDataSlot()
let slotTest () =
// Set different data in each thread's data slot.
Thread.SetData(localSlot, randomGenerator.Next(1, 200))
// Write the data from each thread's data slot.
printfn $"Data in thread_{AppDomain.GetCurrentThreadId()}'s data slot: {Thread.GetData localSlot, 3}"
// Allow other threads time to execute SetData to show
// that a thread's data slot is unique to the thread.
Thread.Sleep 1000
printfn $"Data in thread_{AppDomain.GetCurrentThreadId()}'s data slot: {Thread.GetData localSlot, 3}"
let newThreads =
[| for _ = 0 to 3 do
let thread = Thread Slot.slotTest
thread.Start()
thread |]
Imports System.Threading
Class Test
<MTAThread> _
Shared Sub Main()
Dim newThreads(3) As Thread
For i As Integer = 0 To newThreads.Length - 1
newThreads(i) = New Thread(AddressOf Slot.SlotTest)
newThreads(i).Start()
Next i
End Sub
End Class
Public Class Slot
Shared randomGenerator As Random
Shared localSlot As LocalDataStoreSlot
Shared Sub New()
randomGenerator = new Random()
localSlot = Thread.AllocateDataSlot()
End Sub
Shared Sub SlotTest()
' Set different data in each thread's data slot.
Thread.SetData(localSlot, randomGenerator.Next(1, 200))
' Write the data from each thread's data slot.
Console.WriteLine("Data in thread_{0}'s data slot: {1,3}", _
AppDomain.GetCurrentThreadId().ToString(), _
Thread.GetData(localSlot).ToString())
' Allow other threads time to execute SetData to show
' that a thread's data slot is unique to the thread.
Thread.Sleep(1000)
' Write the data from each thread's data slot.
Console.WriteLine("Data in thread_{0}'s data slot: {1,3}", _
AppDomain.GetCurrentThreadId().ToString(), _
Thread.GetData(localSlot).ToString())
End Sub
End Class
Keterangan
Important
Kerangka kerja .NET menyediakan dua mekanisme untuk menggunakan penyimpanan lokal utas (TLS): bidang statis relatif utas (yaitu, bidang yang ditandai dengan atribut ThreadStaticAttribute) dan slot data. Bidang statis relatif utas memberikan performa yang jauh lebih baik daripada slot data, dan mengaktifkan pemeriksaan jenis waktu kompilasi. Untuk informasi selengkapnya tentang menggunakan TLS, lihat Thread Local Storage: Thread-Relative Bidang Statis dan Slot Data.
Slot dialokasikan pada semua utas.
Utas menggunakan mekanisme memori penyimpanan lokal untuk menyimpan data khusus utas. Runtime bahasa umum mengalokasikan array penyimpanan data multi-slot untuk setiap proses saat dibuat. Utas dapat mengalokasikan slot data di penyimpanan data, menyimpan dan mengambil nilai data di slot, dan membebaskan slot untuk digunakan kembali setelah utas kedaluwarsa. Slot data unik per utas. Tidak ada utas lain (bahkan utas anak) yang bisa mendapatkan data tersebut.
