[MonoDevelop] Monitor.Wait return false immediately on Mono Runtime

[mono]

Thank you for reply.
I understood race condition.
This code is simplified to understand the problem easily.

I want to know why Moniter.Wait return false before 10 second past.
Probably it is mono specific.
I will ask about this problem in mono community.


> Ah and what I forgot to mention:
> For Monitor.Wait(..) to make sense, _I think_ it should not be
> encapsulated by the lock object is is waiting for - because then it will
> never return true if the lock object was not pulsed PRIOR to entering the
> lock area.
>
> Am 18.09.2011, 18:07 Uhr, schrieb Nicolas Krzywinski
> <opensource at site7even.de>:
>
>> Hello,
>>
>> you have built a beautiful example of a racing condition.
>>
>> Let me explain what your code does in my opinion:
>>
>> 1. Spawn thread that executes Async()
>> 2. Ensleeps this thread for 3 seconds
>> => Now it is unsure how far the thread was able to execute: is it already
>> sitting on the lock?
>>
>> 3. 3 seconds passed, thread is resumed and the Main method as well
>> => Now it depends on first: the thread already sitting on the lock? and
>> second: how quickly a thread can be resumed by the runtime?
>>
>> ==> Depending on those (multiple) speed conditions either the main method
>> or the thread will reach the lock first!
>>
>> Your example shows us that .NET and Mono is implemented different in that
>> case.
>>
>> Regards,
>> 7even
>>
>> Am 18.09.2011, 04:49 Uhr, schrieb mono <mono at webkai.net>:
>>
>>> Hello
>>>
>>> I am using Monodevelop2.6 on Windows Vista.
>>>
>>> I build a following code by .NET Runtime.
>>> Then, 'True' is displayed in 3 second later.
>>>
>>> Next, I build by mono2.10.5 runtime.
>>> And I execute it. But 'False' is displayed in console immediately.
>>>
>>> Please, Advice.
>>>
>>>
>>> using System;
>>> using System.Threading;
>>>
>>> namespace MonoThreadTest
>>> {
>>>  class MainClass
>>>  {
>>>   static object lockObj = new object();
>>>  public static void Main (string[] args)
>>>   {
>>>    new Thread(new ThreadStart(Async)).Start();
>>>   Thread.Sleep(3 * 1000);
>>>   lock(lockObj)
>>>    {
>>>     Monitor.PulseAll(lockObj);
>>>    }
>>>   Console.Read();
>>>   }
>>>  static void Async()
>>>   {
>>>    lock(lockObj)
>>>    {
>>>     Console.WriteLine(Monitor.Wait(lockObj, 10 * 1000));
>>>    }
>>>   }
>>>  }
>>> }
>>>
>>
>>
>
>
> -- 
> www.site7even.de | www.nskcomputing.de
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