I have an external dll with some methods I need to call. Also, I want to be able to configure a timeout for executing these methods, in order to abort them if execution time > config timeout. I call these methods on different tasks, like this:
Parallel.ForEach(....
{
Func<object> asyncFucntion = () => DynamicCall(method, paramList);
IAsyncResult ar = asyncFucntion.BeginInvoke(null, null);
if (ar.AsyncWaitHandle.WaitOne(timeout, true))
{
return asyncFucntion.EndInvoke(ar);
}
else
{
//HERE I NEED to stop DynamicCall. Timeout was EXCEEDED
}
});
Now, I have the possibility to get the DynamicCall Thread id and abort it. Is there any other way around? A more light way? I can't use the Cancellation Tokes, since i can't modify the external Dll
Thanks, Alex
Aborting a thread (especially a pool thread) is a really horrible thing to do. You may consider just letting each asyncFunction
call come to an end naturally, without observing its result in case of time-out. See "How do I cancel non-cancelable async operations?"
On a side note, you're using Parallel.ForEach
quite inefficiently here, the operation is taking roughly two times more threads than really needed. Without Parallel.ForEach
, it might look like below, which is a better version, IMO:
var tasks = methods.Select(method =>
{
Func<object> asyncFunction = () => DynamicCall(method, paramList);
var task = Task.Factory.FromAsync(
(asyncCallback, state) => asyncFunction.BeginInvoke(asyncCallback, state),
(asyncResult) => asyncFunction.EndInvoke(asyncResult),
null);
return Task.WhenAny(task, Task.Delay(timeout)).Unwrap();
});
Task.WhenAll(tasks).Wait(); // or Task.WaitAll();
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