SpinWait.Reset Metode

Definisi

Ruang nama:

System.Threading

Rakitan:

netstandard.dll, System.Threading.dll

Sumber:

SpinWait.cs

Mengatur ulang penghitung putar.

public:
 void Reset();

public void Reset();

member this.Reset : unit -> unit

Public Sub Reset ()

Contoh

Berikut ini adalah contoh penggunaan SpinWait dalam implementasi tumpukan bebas kunci sederhana. (Ini hanyalah contoh. Jika diperlukan tumpukan aman utas yang efisien, pertimbangkan untuk menggunakan ConcurrentStack.)

using System;
using System.Threading;

public class LockFreeStack<T>
{
    private volatile Node m_head;
    private class Node { public Node Next; public T Value; }
    public void Push(T item)
    {
        var spin = new SpinWait();
        Node node = new Node { Value = item }, head;
        while (true)
        {
            head = m_head;
            node.Next = head;
            if (Interlocked.CompareExchange(ref m_head, node, head) == head) break;
            spin.SpinOnce();
        }
    }
    public bool TryPop(out T result)
    {
        result = default(T);
        var spin = new SpinWait();
        Node head;
        while (true)
        {
            head = m_head;
            if (head == null) return false;
            if (Interlocked.CompareExchange(ref m_head, head.Next, head) == head)
            {
                result = head.Value;
                return true;
            }
            spin.SpinOnce();
        }
    }
}

Imports System.Threading

Public Class LockFreeStack(Of T)
    Private m_head As Node
    Private Class Node
        Public [Next] As Node
        Public Value As T
    End Class
    Public Sub Push(ByVal item As T)
        Dim spin As New SpinWait()
        Dim head As Node, node As New Node With {.Value = item}
        While True
            Thread.MemoryBarrier()
            head = m_head
            node.Next = head
            If Interlocked.CompareExchange(m_head, node, head) Is head Then Exit While
            spin.SpinOnce()
        End While
    End Sub
    Public Function TryPop(ByRef result As T) As Boolean
        result = CType(Nothing, T)
        Dim spin As New SpinWait()
        Dim head As Node
        While True
            Thread.MemoryBarrier()
            head = m_head
            If head Is Nothing Then Return False
            If Interlocked.CompareExchange(m_head, head.Next, head) Is head Then
                result = head.Value
                Return True
            End If
            spin.SpinOnce()
        End While
    End Function
End Class

Keterangan

Hal ini membuat SpinOnce dan NextSpinWillYield berulah seolah-olah tidak ada panggilan yang SpinOnce dikeluarkan pada instans ini. SpinWait Jika instans digunakan kembali berkali-kali, mungkin berguna untuk mengatur ulang agar tidak menghasilkan terlalu cepat.

Lihat juga

• SpinWait
• Cara: Menggunakan SpinWait untuk Menerapkan Operasi Tunggu Two-Phase