How to send ownerTid into a parallel foreach loop?

[adnan338 via Digitalmars-d-learn]

I have a list of files to download, and I want to download them 
in parallel. At the end of each of those parallel download I want 
to send the main thread a message from the parallel loop.

import std.concurrency, std.parallelism;
string[] files = ["a", "b", "c"];

void download(string[] links)
{
        auto owner = ownerTid();
        foreach (link; links.parallel())
        {
                // something
                owner.send(false);
        }
        owner.send(true);
}

void main()
{
        // I do not want my main thread to freeze
        spawn(&download, files);
        bool done = false;
        while (!done)
                receive((bool isDone) { done = isDone; });
}

But the compiler says:
Error: static assert:  "Aliases to mutable thread-local data not 
allowed."
source/app.d(19,7):        instantiated from here: spawn!(void 
function(string[]), string[])

How should I go around this? I think the parallel block is being 
restricted from sending messages to the owner.
Here,