原文转载，只为分享，感谢原博主，https://blog.csdn.net/wlz1992614/article/details/52326881
1.Loom的原理
Loom继承自MonoBehaviour，在Unity流程管理中Update方法下检查需要回调的Action进行加锁并回调，确保在主线程执行，回调序列本身又作为静态数据保存，在任意线程调用添加，简单轻量
2.初始化优化
原版Loom的初始化方法较为繁琐，每个场景都需要进行初始化，其实可以使用Unity的永不销毁方法来将Loom作为一个永久物体保存下来。
这样，只需在初始化时的主线程中调用一次
Loom.Initialize();
之后在任意场景任意线程均可调用
Loom.QueueOnMainThread(()=>{
});
来完成主线程的操作
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System;
using System.Threading;
using System.Linq;
public class Loom : MonoBehaviour
{
public static int maxThreads = 8;
static int numThreads;
private static Loom _current;
public static Loom Current
{
get
{
Initialize();
return _current;
}
}
//####去除Awake
// void Awake()
// {
// _current = this;
// initialized = true;
// }
static bool initialized;
//####作为初始化方法自己调用，可在初始化场景调用一次即可
public static void Initialize()
{
if (!initialized)
{
if(!Application.isPlaying)
return;
initialized = true;
GameObject g = new GameObject("Loom");
//####永不销毁
DontDestroyOnLoad (g);
_current = g.AddComponent<Loom>();
}
}
private List<Action> _actions = new List<Action>();
public struct DelayedQueueItem
{
public float time;
public Action action;
}
private List<DelayedQueueItem> _delayed = new List<DelayedQueueItem>();
List<DelayedQueueItem> _currentDelayed = new List<DelayedQueueItem>();
public static void QueueOnMainThread(Action action)
{
QueueOnMainThread( action, 0f);
}
public static void QueueOnMainThread(Action action, float time)
{
if(time != 0)
{
if (Current != null)
{
lock (Current._delayed)
{
Current._delayed.Add(new DelayedQueueItem { time = Time.time + time, action = action });
}
}
}
else
{
if (Current != null)
{
lock (Current._actions)
{
Current._actions.Add(action);
}
}
}
}
public static Thread RunAsync(Action a)
{
Initialize();
while(numThreads >= maxThreads)
{
Thread.Sleep(1);
}
Interlocked.Increment(ref numThreads);
ThreadPool.QueueUserWorkItem(RunAction, a);
return null;
}
private static void RunAction(object action)
{
try
{
((Action)action)();
}
catch
{
}
finally
{
Interlocked.Decrement(ref numThreads);
}
}
void OnDisable()
{
if (_current == this)
{
_current = null;
}
}
// Use this for initialization
void Start()
{
}
List<Action> _currentActions = new List<Action>();
// Update is called once per frame
void Update()
{
lock (_actions)
{
_currentActions.Clear();
_currentActions.AddRange(_actions);
_actions.Clear();
}
foreach(var a in _currentActions)
{
a();
}
lock(_delayed)
{
_currentDelayed.Clear();
_currentDelayed.AddRange(_delayed.Where(d=>d.time <= Time.time));
foreach(var item in _currentDelayed)
_delayed.Remove(item);
}
foreach(var delayed in _currentDelayed)
{
delayed.action();
}
}
}
