[Mono-list] mono swallows threadpool exceptions

Daniel Hughes trampster at gmail.com
Wed Jul 21 06:21:43 EDT 2010

Ok I think I have it:


tells us that since .net 2.0 the runtime does not swallow threadpool
exceptions. So that means that the mono implementation is wrong.

On Wed, Jul 21, 2010 at 9:51 PM, Daniel Hughes <trampster at gmail.com> wrote:
> upon further reading this appears to be the correct behavior. Although
> it does not seem to be what is happening in .net I will need to do
> more investigation it seems.
> On Wed, Jul 21, 2010 at 9:16 PM, Daniel Hughes <trampster at gmail.com> wrote:
>> In trying to port our application to run on mono I have discovered
>> that mono is silently swallowing exceptions. This is a really big
>> deal, we expect these exceptions to bubble up and kill the
>> application.
>> There is not even any indication that an exception has occurred it is just lost.
>>                public static void Main (string[] args)
>>                {
>>                        Action action = () =>
>>                        {
>>                                throw new Exception("this should Kill the process but doesn't");
>>                        };
>>                        ThreadPool.QueueUserWorkItem(_ => action());
>>                        while(true)
>>                        {
>>                                Thread.Sleep(1000);
>>                                Console.WriteLine("wrongly still running");
>>                        }
>>                }
>> The implications of this could be catastrophic. Imagine some code
>> which performs a check, finds bad data and throws an exception.
>> However mono swallows that exception so instead of the program closing
>> it carries on running and uses the bad data. This results in sensitive
>> data being lost. Or in our case a radio being bricked.
>> Can someone explain why mono is doing this and if their is some
>> setting / environment variable I can change to make unhandled
>> threadpool exceptions terminate the process as is expected.

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