C#•3w ago

Task cancellation in UDPClient.RecieveAsync not triggering

I'm trying to recieve some UDP data, but give up if it hasnt been gotten within 40 ms. I think the recommended way would be to pass in a TaskCancellationToken where the source has had a call to CancelAfter. However the task doesnt appear to be cancelled at all. When i change my approach and use Task.WhenAny, waiting on either udp or Task.Delay it does work correctly.

CancellationTokenSource src = new CancellationTokenSource();

while (true)
{
    src.CancelAfter(40);
    var len = await udpClient.Client.ReceiveFromAsync(recieveData, remoteEP, src.Token);
    src.TryReset();
}

CancellationTokenSource src = new CancellationTokenSource();

while (true)
{
    src.CancelAfter(40);
    var len = await udpClient.Client.ReceiveFromAsync(recieveData, remoteEP, src.Token);
    src.TryReset();
}

When i disconnect the device i'm connecting to it just hangs on RecieveFrom forever. I tried the overloads in UDPClient and in the underlying socket to no avail. Anything im doing wrong?

1 Reply

qqdev•3w ago

One issue is that you can’t always reuse the CTS You have to recreate it once a timeout occurred And you have to dispose it TryReset will tell you what to do

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Task cancellation in UDPClient.RecieveAsync not triggering