对runWorkerTaskH的访问冲突

Question

我正在尝试从光纤http://vibed.org/api/vibe.core.core/runWorkerTaskH接收数据

“在工作线程中运行新的异步任务，返回任务句柄。”

这是我的代码：

import vibe.vibe;
import std.stdio;
import std.datetime;
import vibe.core.core;

string [] test_urls = ["http://127.0.0.1:8081/hck","http://127.0.0.1:8081/hck2","http://127.0.0.1:8081/hck3"];

struct MyUrl
{
    string url;
    string status;
}

MyUrl myUrl;
MyUrl [] myUrls;


shared static this()
{
    foreach(url;test_urls)
    {
        myUrl.url = url;
        myUrls ~= myUrl;
    }

        setTimer(2.seconds, toDelegate(&processing), true); 

}  

void main()
{
    listenHTTP(":8080", &handleRequest);
    runApplication();
}

void handleRequest(HTTPServerRequest req, HTTPServerResponse res)
{

}

void processing()
{
    writeln("processing");
    //foreach(url; myelements)
    foreach(ref url; myUrls)
    {
        Task answer = runWorkerTaskH(&getServiceStatus, Task.getThis, url);
        writefln("url: %s, status: %s", url.url, url.status);
    }

}

void getServiceStatus(Task caller, MyUrl url) { // seems hiden copy accure

        requestHTTP(url.url,
            (scope req) {
                req.method = HTTPMethod.GET;
            },
            (scope res) {
                Json serviseAnswer = parseJsonString(res.bodyReader.readAllUTF8()); // status and message
                url.status = serviseAnswer["status"].toString(); 
                caller.send("goodbye");
                //url.changeStatus(url.status); 

            }
        );

}

但是运行后出现错误：

Running .\app.exe
[main(----) INF] Listening for requests on http://[::]:8080/
[main(----) INF] Listening for requests on http://0.0.0.0:8080/
processing
url: http://127.0.0.1:8081/hck, status:
url: http://127.0.0.1:8081/hck2, status:
url: http://127.0.0.1:8081/hck3, status:
object.Error@(0): Access Violation
----------------object.Error
@0x00538481(
00x0040B5D5)
: 0x00403B12
Access Violation0x0044D908
----------------

0x00403A1F0x00538481

0x0053B5390x0040B5D5

0xFFFFFFFF0x00403B12
0x7793F30C in RtlCaptureContext

0x0044D908
abnormal program termination
Program exited with code 1

我做错了什么？

我不确定我是否正确调试了应用程序，但是：

logInfo("1111");
caller.send("goodbye");
logInfo("2222");

将打印：

[vibe-7(4hZL) INF] 1111
object.Error@(0): Access Violation

我知道setTimer不会创建任务，而且我总是会得到null。但是我不知道如何解决。