ThreadPool.GetMinThreads(Int32, Int32) 方法

定義

命名空間:

System.Threading

組件:

System.Threading.ThreadPool.dll

Source:

ThreadPool.Unix.cs

在切換至管理執行緒建立和解構的演算法之前，擷取執行緒集區隨著提出新要求，視需要建立的執行緒最小數目。

public:
 static void GetMinThreads([Runtime::InteropServices::Out] int % workerThreads, [Runtime::InteropServices::Out] int % completionPortThreads);

public static void GetMinThreads (out int workerThreads, out int completionPortThreads);

static member GetMinThreads : int * int -> unit

Public Shared Sub GetMinThreads (ByRef workerThreads As Integer, ByRef completionPortThreads As Integer)

參數

workerThreads

Int32

當這個方法傳回時，會包含執行緒集區視需要建立的背景工作執行緒最小數目。

completionPortThreads

Int32

當這個方法傳回時，會包含執行緒集區視需要建立的非同步 I/O 執行緒最小數目。

範例

下列範例會將背景工作執行緒數目下限設定為四個，並保留非同步 I/O 完成執行緒數目下限的原始值。

using namespace System;
using namespace System::Threading;
int main()
{
   int minWorker;
   int minIOC;
   
   // Get the current settings.
   ThreadPool::GetMinThreads( minWorker, minIOC );
   
   // Change the minimum number of worker threads to four, but
   // keep the old setting for minimum asynchronous I/O
   // completion threads.
   if ( ThreadPool::SetMinThreads( 4, minIOC ) )
   {
      
      // The minimum number of threads was set successfully.
   }
   else
   {
      
      // The minimum number of threads was not changed.
   }
}

using System;
using System.Threading;

public class Test
{
    public static void Main()
    {
        int minWorker, minIOC;
        // Get the current settings.
        ThreadPool.GetMinThreads(out minWorker, out minIOC);
        // Change the minimum number of worker threads to four, but
        // keep the old setting for minimum asynchronous I/O 
        // completion threads.
        if (ThreadPool.SetMinThreads(4, minIOC))
        {
            // The minimum number of threads was set successfully.
        }
        else
        {
            // The minimum number of threads was not changed.
        }
    }
}

Imports System.Threading

Public Class Test

    <MTAThread> _
    Public Shared Sub Main()
        Dim minWorker, minIOC As Integer
        ' Get the current settings.
        ThreadPool.GetMinThreads(minWorker, minIOC)
        ' Change the minimum number of worker threads to four, but
        ' keep the old setting for minimum asynchronous I/O 
        ' completion threads.
        If ThreadPool.SetMinThreads(4, minIOC) Then
            ' The minimum number of threads was set successfully.
        Else
            ' The minimum number of threads was not changed.
        End If
    End Sub
End Class

備註

執行緒集區會視需要提供新的背景工作執行緒或 I/O 完成執行緒，直到達到每個類別的最小值為止。 根據預設，執行緒的數目下限設為系統上的處理器數目。 達到最小值時，執行緒集區可以在該類別中建立其他執行緒，或等到某些工作完成為止。 從.NET Framework 4 開始，執行緒集區會建立和終結執行緒，以優化輸送量，其定義為每個單位時間完成的工作數目。 執行緒太少可能無法最有效地利用可用資源，而執行緒太多則可能增加資源爭用的情況。

注意

當需求很低時，執行緒集區執行緒的實際數目可能低於最小值。

另請參閱

• SetMinThreads(Int32, Int32)
• GetMaxThreads(Int32, Int32)
• GetAvailableThreads(Int32, Int32)