abstract class Foo
{
private List<Object> container;
private bool update;
Foo Foo()
{
container = new List<object>();
update = false;
}
public abstract Bar CreateBar();
public void BeginUpdate()
{
if (!update)
{
Thread update_thread = new Thread(new ThreadStart(Update));
update_thread.Start();
}
}
private void Update()
{
update = true;
while (update)
{
lock (container)
{
if (...)
container.Add(this.CreateBar());
else
container.Remove(...);
}
Thread.Sleep(1337);
}
}
public void EndUpdate()
{
update = false;
}
public List<Object> Objects
{
get
{
lock (container)
{
return this.container;
}
}
}
}
当 Foo 之外的东西调用 Foo 的 Object 访问器时,例如,
List<Objects> objects = foo_instance.Objects;
foreach (Object o in objects)
{
Thread.Sleep(31173);
}
锁定将如何发生?运行 Update() 的线程是否必须等到上述 foreach 完成处理对象列表?我希望这两个可以同时工作,是制作对象深层副本的唯一解决方案吗?