如何正确取消Task.Run与内部死锁

Question

I have a event that results in a deadlock when called and need a test to check for deadlock inside. But i don`t have a way to influance the client code.

I allredy tryed several hacks like

Task t = Task.Run((Action)(() => { while(true); }), cts.Token);

And ways to insert a token inside a delegate but since deadlock is called within delegate - any await never happens.

void Action()
{
    var request = WebRequest.Create(url);(requestUrl);
    request.GetResponse();
    received = instance.RequestReceived;
}

instance.ClientRequeest += (object sender, EventArgs e) => instance.Stop();

I have a EventHandler ClientRequest i can subscribe to. And an instance of a client that drops to deadlock when i try to stop it while it has some data to reply.

ClientRequest has a await inside - witch, when asked to Stop and has a request - falls to infinite deadlock state - it awaits when request will be sent, and listener is allredy closed by Stop. Wich is a posseble scenario in our case. But i don`t seem to find a way how to call a that event without going to deadlock myself inside the test.

So would be pretty thankfull for a proper way to make that Instance.ClientRequest wait for several seconds and throw exception or get cancelled or whatever - to avoid test hanging when deadlock actually happens.

Answer 1

If you have a Task , and you know it will either complete in a fixed amount of time, or deadlock, you could:-

var t = Task.Run(() =>
{
    // do something that might deadlock, but if it doesn't will finish for sure in < 1000ms
});

if (!t.Wait(1000))
{
    // He's dead Jim
}