[Mono-list] gc handles not thread safe?

Chris Ochs chris at ochsnet.com
Thu Oct 17 03:48:09 UTC 2013

It's pretty much impossible to provide a test case that doesn't involve
installing Akka.   I could probably provide a self contained bundle that
someone could just run from the command line that would trigger it, using
as little java/akka as possible.


On Wed, Oct 16, 2013 at 8:20 PM, Rodrigo Kumpera <kumpera at gmail.com> wrote:

> GC Handles are thread safe as they are used all the time by Xamarin's
> products.
> The best line of approach here is to file a bug report with a test case,
> that's how you get a possible mono bug fixed.
> On Wed, Oct 16, 2013 at 10:56 PM, Chris Ochs <chris at ochsnet.com> wrote:
>> I'm embedding mono in a java app and when using gchandles it's obvious
>> that memory is getting stomped on somehow.  When I don't use gc handles, or
>> just use gc handles within a single thread, everything is fine.
>> The same gc handle is never accessed concurrently from different threads,
>> although I do pass them around to different threads.
>> Reading/writing memory streams triggers the problem regularly, it usually
>> segfaults in BlockCopy with various errors about the stream not containing
>> the expected data, or sometimes division by zero.
>> I'm fairly sure the code that handles threading is not at fault, I'm
>> using Akka which has a well established concurrency model I don't
>> explicitly create any threads myself.
>> FYI I see this in mono 2 and the latest mono 3 from master.
>> Is there another technique I can use to keep a MonoObject around and keep
>> the gc from collecting it without using gc handles?   I was thinking of
>> just having a thread safe dictionary in C# that keeps references to these
>> objects, and just make all my calls into managed code via static methods
>> that can get the object and call methods on it in C#.
>> Chris
>> _______________________________________________
>> Mono-list maillist  -  Mono-list at lists.ximian.com
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