SpinWait.Reset Method

Definition

Namespace:

System.Threading

Assemblies:

netstandard.dll, System.Threading.dll

Source:

SpinWait.cs

Resets the spin counter.

C#

public void Reset();

Examples

The following is an example of using SpinWait in a simple lock-free stack implementation. (This is just an example. If an efficient, thread-safe stack is needed, consider using ConcurrentStack.)

C#

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();
        }
    }
}

Remarks

This makes SpinOnce and NextSpinWillYield behave as though no calls to SpinOnce had been issued on this instance. If a SpinWait instance is reused many times, it may be useful to reset it to avoid yielding too soon.

Applies to

See also

• SpinWait
• How to: Use SpinWait to Implement a Two-Phase Wait Operation