C#

• in neutral state, _tail.next is null; the end of the list.
  
• the first thread executes the interlocked operation which succeeds and atomically sets _tail.next to something other than null.
  
• this causes the interlocked operation to fail on any other thread, and spin.
  
• the final assignment returns _tail.next to null (as a new list node has no next-node) and the list is coherent.
  

void addNode(Node newNode) {    // unsafe version
    newNode.next=head.next;
    head.next=newNode;
}
Node removeFirstNode() {    // unsafe version
    Node firstNode=head.next;
    head.next=firstNode.next;   // <<--- modified
    return firstNode;
}

void addNode(Node newNode) {    // safe version
    do {
        Node firstNode=head.next;
        newNode.next=firstNode;
    } while (firstNode!=Interlocked.ExchangeCompare(head.next,newNode,firstNode));
}

Node removeFirstNode() {    // safe version
    do {
    Node firstNode=head.next;
    } while (firstNode!=Interlocked.ExchangeCompare(head.next, firstNode.next, firstNode));
    return firstNode;
}

while (0!=Interlocked.ExchangeCompare(lockVar, 1, 0)) Thread.Sleep(1);
// do whatever you want now, even multiple stores
lockVar=0;

this.tabControl1.TabPages[0].Text="whatever you want";

this.tabControl1.TabPages[0].Name = this.textBox1.Text;

Mircea Puiu wrote:

Take those pieces of code and replicate them when you need.

this.SuspendLayout();
TheNewButton = new Button();
this.TheNewButton.TextAlign = ContentAlignment.MiddleCenter;
this.TheNewButton.Width = 140;
this.TheNewButton.Height = 40;
this.TheNewButton.Text = "New button";
this.TheNewButton.UseVisualStyleBackColor = true;
this.TheNewButton.Visible = true;
this.TheNewButton.Location = new System.Drawing.Point(150, 24);
this.Controls.Add(TheNewButton);
this.TheNewButton.Click += new System.EventHandler(this.TheNewButton_Click);
this.ResumeLayout();
this.Refresh();

private void TheNewButton_Click(object sender, EventArgs e)
{
  // Do something here ...
}

        private void button1_Click(object sender, EventArgs e)
        {
            Button buttonNew  = new Button();
            buttonNew.Location = new Point(button1.Left + button1.Width +25, button1.Top );
            buttonNew.Name = "buttonNew";
            buttonNew.Size = new Size(130, 26);
            buttonNew.Text = "buttonNew";
            buttonNew.Click += delegate(System.Object o, EventArgs eArgs)
                   { MessageBox.Show("new button clicked"); };

            this.Controls.Add(buttonNew);
        }