AS3项目，AIR开发，使用多线程Worker，怎么让多个相同的子线程判断自己是线程池中的哪一个？？

Question

AS3项目，AIR开发，使用多线程Worker，怎么让多个相同的子线程判断自己是线程池中的哪一个？？

如题，假如我想使用4个相同的子线程，命名为worker1-worker4，这4个线程同时执行不同的任务。线程的创建和启动都没有问题，问题在于：如何让这4个子线程分别知道自己是哪一个线程？或者说自己在线程池中的名称/索引？不搞清这个问题，子线程就没法和主线程正确建立MessageChannel，也就没法通信。
我翻遍了所有官方的api，没找到任何有帮助的信息，也没找到相关的机制（也可能是我太菜），网上能搜到的所有方法也试过了，都失败了。
我的想法是在每个子线程内使用WorkerDomain.current.listWorkers()方法获取线程池，然后逐一判断池内某项是否等于Worker.current。看起来逻辑似乎合理，以下是我按照这个思路写的小样，运行起来虽然不报错，但也不正确。
有没有人能指出更好的思路？或者完善我的思路，Worker这玩意太难用了！

 
import flash.events.Event;
import flash.system.MessageChannel;
import flash.system.Worker;
import flash.system.WorkerDomain;
 
var curID: int = -1
 
var mainToWorker1: MessageChannel
var mainToWorker2: MessageChannel
var mainToWorker3: MessageChannel
var mainToWorker4: MessageChannel
 
var worker1ToMain: MessageChannel
var worker2ToMain: MessageChannel
var worker3ToMain: MessageChannel
var worker4ToMain: MessageChannel
 
if (Worker.current.isPrimordial) {
    var worker1 = WorkerDomain.current.createWorker(this.loaderInfo.bytes, true);
    var worker2 = WorkerDomain.current.createWorker(this.loaderInfo.bytes, true);
    var worker3 = WorkerDomain.current.createWorker(this.loaderInfo.bytes, true);
    var worker4 = WorkerDomain.current.createWorker(this.loaderInfo.bytes, true);
 
    mainToWorker1 = Worker.current.createMessageChannel(worker1);
    mainToWorker2 = Worker.current.createMessageChannel(worker2);
    mainToWorker3 = Worker.current.createMessageChannel(worker3);
    mainToWorker4 = Worker.current.createMessageChannel(worker4);
 
    worker1ToMain = worker1.createMessageChannel(Worker.current);
    worker2ToMain = worker2.createMessageChannel(Worker.current);
    worker3ToMain = worker3.createMessageChannel(Worker.current);
    worker4ToMain = worker4.createMessageChannel(Worker.current);
 
    worker1.setSharedProperty("mainToWorker1", mainToWorker1);
    worker2.setSharedProperty("mainToWorker2", mainToWorker2);
    worker3.setSharedProperty("mainToWorker3", mainToWorker3);
    worker4.setSharedProperty("mainToWorker4", mainToWorker4);
 
    worker1.setSharedProperty("worker1ToMain", worker1ToMain);
    worker2.setSharedProperty("worker2ToMain", worker2ToMain);
    worker3.setSharedProperty("worker3ToMain", worker3ToMain);
    worker4.setSharedProperty("worker4ToMain", worker4ToMain);
 
    worker1ToMain.addEventListener(Event.CHANNEL_MESSAGE, fstep3);
    worker2ToMain.addEventListener(Event.CHANNEL_MESSAGE, fstep3);
    worker3ToMain.addEventListener(Event.CHANNEL_MESSAGE, fstep3);
    worker4ToMain.addEventListener(Event.CHANNEL_MESSAGE, fstep3);
 
    worker1.start();
    worker2.start();
    worker3.start();
    worker4.start();
 
} else {
    curID = getCurID()
    this["mainToWorker" + curID] = Worker.current.getSharedProperty("mainToWorker" + curID);
    this["worker" + curID + "ToMain"] = Worker.current.getSharedProperty("worker" + curID + "ToMain");
    this["mainToWorker" + curID].addEventListener(Event.CHANNEL_MESSAGE, fstep2);
 
}
 
 
function getCurID() {
    //这个获取ID的方式有没有问题？每个子线程中执行listWorkers()返回的结果是否一致？不知道
    var v = WorkerDomain.current.listWorkers()
    for (var a: int = 0; a < v.length; a++) {
        if (v[a].isPrimordial) {
            v.splice(a, 1)
            break
        }
    }
    for (var b: int = 0; b < v.length; b++) {
        if (v[b] == Worker.current) {
            return b + 1
        }
    }
}
 
 
//步骤1：点击屏幕发送初始消息
stage.addEventListener("click", f1)
function f1(e) {
    txt1.appendText("\n初始消息已发送\n")
    mainToWorker1.send("")
    mainToWorker2.send("")
    mainToWorker3.send("")
    mainToWorker4.send("")
}
 
//步骤2：子线程收到消息，发送自己的编号
function fstep2(event: Event) {
    this["worker" + curID + "ToMain"].send(curID)
}
 
//步骤3：主线程接收子线程编号
function fstep3(event: Event): void {
    txt1.appendText("从分支线程发来的消息是\"" + event.target.receive() + "\"\n")
}